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nv_250hucs

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Steeves, Peter and Douglas Nebert
Publication_Date: 1994
Title: nv_250hucs
Edition: 1
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 94-0236
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Online_Linkage: N\A
Description:
Abstract:
The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a number of data layers which were of interest to the USGS. One of these data layers was the Hydrologic Units. The map is based on the Hydrologic Unit Maps published by the U.S. Geological Survey Office of Water Data Coordination, together with the list descriptions and name of region, subregion, accounting units, and cataloging unit. The hydrologic units are encoded with an eight- digit number that indicates the hydrologic region (first two digits), hydrologic subregion (second two digits), accounting unit (third two digits), and cataloging unit (fourth two digits).

The data produced by GIRAS was originally collected at a scale of 1:250K. Some areas, notably major cities in the west, were recompiled at a scale of 1:100K. In order to join the data together and use the data in a geographic information system (GIS) the data were processed in the ARC/INFO GUS software package. Within the GIS, the data were edgematched and the neatline boundaries between maps were removed to create a single data set for the conterminous United States.

HUC, GIRAS, Hydrologic Units, 1:250

Purpose:
This data set was compiled originally to provide the National Water Quality Assessment (NAWQA) study units with an intermediate- scale river basin boundary for extracting other GIS data layers. The data can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2 million).
Supplemental_Information:
Procedures_Used: The data was recieved as compressed giras tar files representing either a 1:250,000-scale (1:250K) quadrangle or a 1:100,000-scale (1:100K) quadrangle. Each file was named after its respective quadrangle. A coverage of 1:250k quadrangles was used to divide the country up into four sections and get a list of names for each section. Using GIRASARC2, an aml designed to create an ARC/INFO data set (coverage) from a GIRAS file and a corresponding neat line coverage, it was quickly discovered that many of the quad names were to long for the program (i.e. sault_saint_marie) and a generic naming system for files and coverages was incorporated. In 1 of 10 cases, the name of the quadrangle did not correspond with the name of the file. These problems were traced down and corrected (after all four sections were converted there were many files left over...these wound up be all the 1:100k quads which did not have similar names to the 1:250k files).

After the files for a given section were all converted into ARC/INFO format, a loop aml was run which copied a coverage and its neatline cover into temporary storage (there was not enough room in info to deal with a large number of files in one directory), attached to that directory, built line topology, and went into the editor, ARCEDIT. In ARCEDIT, the outer edge (original neatline) was selected and deleted an the mathematically-calculated neatline coverage from the GIRASNEAT AML program was copied in using the ARCEDIT GET command. The original neatline was replaced with a calculated neatline because in all cases, the outline of the coverage quad never quite conformed to a "true" neatline causing overlaps and gapes between adjacent maps. The new neatline was connected to the internal arcs where they intersected. Lines which did not quite join the new neatline were extended to the edge with a maximum tolerance of 500 meters. All extensions were made within this tolerance. All arcs which extended beyond the new neatline were clipped off within a 500 meter tolerance as arguments to the CLEAN command into a separate directory. Both the neatline and huc coverages were deleted from the temporary space, and the program looped to the next coverage.

Another program was then run which added an item to the .aat called OUTER, went into INFO, and populated the attribute for all arcs composing the new neatline. This was done by reselecting for the identity of the polygon to the left or right of each arc whose value was "1", the identity of the outer "universe" polygon (reselect lpoly# = 1 or rpoly# = 1 in the .aat and calculated outer to = 1). All coverages were checked for additional dangles and then a MAPJOIN was run using NET as the feature option. Finally, most map edge lines were removed from the MAPJOINed coverage using the DISSOLVE to create a seamless basin coverage with polygons (basins) and arcs (boundaries) with attributes.

Quality control methods were applied to the resulting coverage by detecting and fixing node and label errors and remaining neat line arc problems (i.e. long neat lines still in the coverage). Many more problems arose in the western part of the country than in the east. Bordering HUC code disagreements between quads caused a number of cases in which neatlines did not dissolve. These were provisionally corrected for the most part, however there were several cases that required external review and editing to fix, and are now incorporated in the final data set. After all 1:250K sections were completed, the same procedure was run for the handful of 1:100k quads. These were mapjoined with the 1:250k quads to provide more detailed coverage where it was available.

Revisions: Revision #1. See above for all the details Process_Date 10/92 Revision #2. Seattle and Bakersfield quadrangles were missing from the composite supplied by Pete Steeves. These were manually pasted in using Arcedit with small tolerances. Labelerrors were remedied and most dangles were removed using the Eliminate command. Process_Date 1/93 Revision #3. The following changes were made to a 1:250,000-scale version derived from National Mapping Divisions Geographic Information Retrieval and Analysis System (GIRAS) data. The discrepancies in the hydrologic unit codes (HUCs) in California were changed because the California State Hydrologic Unit Map (HUM) was revised in 1978 but the 1:250,000-scale digital dataset was not. This has been reviewed by Bill Battaglin, Doug Nebert, and Paul Kapinos and is noted under Reviews (#6 below).

The areas in which the HUC labels were incorrect in California were 180701, 180702, 180703, 180600, 180300, and 180400. Boundaries were added in 180702 and 180600 from the 1:2 million source. Along the Oregon/California border, a boundary was added in 180102. In Wyoming, a boundary was added in 100902 from the 1:2 million source. Labels were corrected in these HUCs to reflect state updates, and where necessary, to add new labels to the newly-drawn boundaries. Map edges were manually removed in Arkansas, California, and along the Oregon/California border.

After the changes were made and saved in Arcedit, the build and clean commands were executed, followed by labelerrors. Three polygons had duplicate labels and were corrected. The labels were centered in the polygons by the centroidlabels command. Verification of the coverage was done by the describe command. Process_Date 12/93. Revision #4. The NAMES file was added to the data set and its attributes were defined in the ATT file of the documentaton. This table is a lookup table to correlate the 8-digit numbers with verbose names officially assigned to the basins. Process_Date 3/94. Revision #5. The following corrections were made to the 1:250,000-scale coverage of Hydrologic Unit Codes (HUC250):

Valid HUC code, 7140103, added to HUC250.NAM. Bourbeuse, Missouri. HUC250.NAM was sorted on HUC.

HUC frequency >1, tiny polygons were deleted that were erroneous:

17010212 deleted small poly to NW of main poly 10130305 deleted small poly to S of main poly 10230005 deleted small poly to S of main poly 14020001 deleted small poly to N of main poly 15050201 deleted small poly to W of main poly 04080203 deleted small poly to N of main poly 03120001 deleted small poly to S of main poly

Invalid HUC codes, not in names file, were corrected:

18020023 HUC should be 18020111 (in N-central California) 18070010 HUC should be 18070303 (in so. California) 15010017 HUC should be 15010007, delete arc separating it (in nw Arizona) 1870201 HUC should be 18070201 (in so. California, missing an 0) 1870204 HUC should be 18070204 (in so. California, missing an 0) 18060012 HUC should be 18060011 (in so. California, improper polygon closure)

18060011 HUC label added after polygon closure of 18060011

HUC frequency >1, larger polys were checked and corrected:

18020126 western poly is 18020108 in HUC2M (CA) 18050005 southern poly is 18050006 in HUC2M (CA) 18060006 split into 2 polys, no apparent reason, delete arc splitting polys (CA) 04110001 and 04100001 together are 04100001 in HUC2M (MI) (MAPEDGE was deleted) 02080108 northwestern poly is 02080208 in HUC2M (VA)

The invalid HUC codes, and 7140103 were found by relating to the HUC250.NAM file, and identifying polygons with no match in the names file. The rest were found by looking at the 96 polygons which had HUC codes with frequencies >1 in the PAT. Most of these seemed to be correct, and were along the US-Canada boundary, or were islands along the coasts.

These errors were found in the HUC250 coverage published as OFR 94-0326. Process_Date 12/94 & 1/95 Reviews_Applied_to_Data: Peer review, 10/18/93, Bill Battaglin, USGS-WRD, Lakewood, Co, memo to Doug Nebert: - "I have completed a review of the 1:250,000 scale hydrologic units coverage (HUC) and found the digital data and metadata to be of high quality. I have a few suggested improvements to the digital data and to the documentation. Below is a summary of the methods I used to check feature accuracy in the digital data base and the problems I found.

Digital Features:

The line work for the HUC coverage was checked against the line work from:

(1) the 1:2,000,000 HUC coverage by plotting both data sets out on one large graphic (about 1:3,000,000). No major discrepancies were found except in coastal areas where the 1:2,000,000 scale coverage had more detail than the 1:250,000 scale coverage.

(2) line work from 1:24,000 scale digitized drainage basins in Colorado, Illinois, and New Jersey. The match was generally good with departures generally less than 2500 meters. The biggest departures were in Colorado and were as large as 4000 meters.

(3) line work from the 1:2,000,000 scale rivers coverage for the USA by plotting both data sets out on one large graphic (about 1:3,000,000). In general the nesting of streams in HUCs was good and HUC boundaries inter- sected steams at stream intersections. In some places (SE New Mexico, SE California and NW Utah), the streams coverage does not match the HUC coverage that well, but this could easily be because of the unusual nature of streams in these areas or because of inaccuracies in the streams coverage.

(4) line work from 1:100,000 scale streams from Colorado, Illinois, and Kansas. The nesting of streams in HUCs was very good. Stream arcs for the most part did not cross HUC arcs except at stream intersections. The error (distance from intersection to HUC line) between HUC lines and stream intersection was less than 500 meters at all intersections checked (about 25).

Problems with Line work:

(1) There was a very large number of very short arcs in the coverage (3211 Lt 1000 meters long and 1729 Lt. 100 meters long). Most of these arcs were internal (did not border on outside polygon) and coded as 250k edges(3) (almost 3000) but some were 250k (2) lines and one was a 2m dlg (4). Arcs with lengths of less than 100 meters (maybe even less than 1000 meters) are difficult to deal with when editing subsets of the coverage, and they also add to the overall size of the database. I know many of these lines were created in the process of edgematching the quads, but I think the informa- tion content of these very short arcs is less valuable than the hassle and overhead involved in keeping them in the coverage.

(2) The edit distance for the coverage was set to a very small value. This may have been required for earlier processing, however, it makes the finished coverage difficult to work with. I had to reset the edit distance to a larger value when I wanted to select arcs in ARCEDIT interactively. This, of course, will be one of the things users will want to do with the new HUC coverage.

Polygon labels/attributes:

(1) Label point accuracy was checked by making a point cover of polygon labels from the 1:2,000,000 HUC coverage and then doing an identify of those points in the 1:250,000 scale HUC polygon. This procedure looked for both new or missing polygons, and was also used to check attribute values. I also dissolved both coverages by accounting unit and compared the number and location of remaining polygons.

Problems with labels/attributes:

(1) I discovered a total of 649 places where the HUC codes from the label point of the 1:2,000,000 coverage did not match the HUC code for the 1:250,000 HUC polygon that it fell within. As you had indicated in the documentation, there were a lot of differences in California. The 2m HUC had lots of label points resulting from islands, bays, and estuaries that are not included in the 1:250,000 scale HUC coverages. In other places the polygons seemed to be the same but the HUC codes were different. For example HUC 18020111 in the 1:2,000,000 coverage is coded as HUC 18020023 in the 1:250,000 coverage. There were also many differences in the Great Lakes. It seems odd that the 1:2,000,000 coverage should have more detail with regard to coastal features than the 1:250,000 scale coverage has. There were also internal polygon label differences in Minnesota (7100001 in 250k, 70200001 in 2m), Colorado (10090204 in 250k, 10180007 in 2m), Illinois (mistake in the 2m HUC I think), and Louisiana (11140203 in 250k, 11140202 in 2m). Texas and Florida also have a few that look like they should be checked.

(2) The dissolved 1:2,000,000 coverage contained 350 accounting unit polygons while the dissolved 1:250,000 HUC coverage only contained 177. There were large differences in the way the Accounting unit polygons looked in the Great Lakes Region, and in parts of California, Wyoming, and Florida. Again, many of the differences result from the use of a cruder coastline in the 1:250,000 scale HUC coverage.

Coverage Documentation:

The coverage documentation was reviewed both editorially and for overall completeness. The documentation was editorially sound and did not need any corrections.

Problems with the Documentation:

(1) The redefined items in the pat file were not defined in the data dictionary portion of the documentation file.

(2) The complete reference to the source material for the data is not in the documentation file."

Response to Peer review by Bill Battaglin, 1/5/93, Doug Nebert,USGS-WRD Reston 

Data were reviewed for attribute accuracy against a 1:2million base through random audit of polygon features. Line attributes were verified by symbol- ization on the screen. Regions were shaded in to verify correct polygon values for HUC at the Hydrologic Region level. Documentation was updated. The short arcs along the quadrangle boundaries were kept in the data set due to the importance of maintaining as much original information as possible. Basin codes were updated and additional erroneous neatlines removed.

Peer review, 11/10/93, Doug Nebert, USGS-WRD, Reston, memo to Paul Kapinos: "As you are aware, we have several digital versions of the hydrologic unit maps for the United States and I am in the process of verifying and publishi a 1:250,000-scale version derived from National Mapping Division Geographic Information Retrieval and Analysis System (GIRAS) data as part of their land use mapping program of the 1970s and early 1980s.

In comparing the 1:250,000-scale data reviewers noticed differences in both basin definition and hydrologic unit codes in Southern California and in the San Joaquin valley. The 1974 state map, at 1:500,000-scale agrees with the 1:250,000-scale GIRAS data in boundaries and numbers, whereas the 1:2.5 mill "wall map" of the U.S. agrees with the 1:2,000,000 digital data set. Both p maps are authoritative sources of information, but apparently something chan between the two maps.

On a related note, it is worthwhile to mention that the 1:2.5 million-scale wall map for the western U.S. is being revised to include new Alaska hydrolo unit codes before reprinting. It would be wise to be sure that the boundari depicted there are also the authoritative ones.

I would appreciate your review and adjudication of the California hydrologic unit definitions in order for us to publish this digital data set. Please provide a written response (e-mail and paper copy) and marked-up maps as to which basins and boundaries are current."

Peer review, 11/29/93, Paul Kapinos, USGS-WRD, memo to Doug Nebert:  "The discrepancies in the hydrologic unit codes (and some boundaries) in the State of California are due to the fact that the California State Hydrologic Unit Map (HUM) was revised in 1978 but the 1:250,000-scale digital data set was not. The events that most likely occurred can be summarized as follows:

o The 1:500,000-scale HUMs were published by OWDC over a period of about four years between 1974 and 1978.

o The National Mapping Division (NMD) overlaid the hydrologic unit boundaries on their 1:250,000-scale land-use and land-cover map series after each State HUM was completed, and later digitized these boundaries and their respective codes.

o In 1978, the State of California asked OWDC to revise the hydrologic unit boundaries and codes in the central valley.

o The 1:500,000-scale California HUM was revised and reprinted but NMD was either not informed of the revisions or chose not to revise or redigitize their 1:250,000-scale overlays.

o Once all the HUMs were printed (including the 1978 revisions of California and South Dakota), the 1980 1:2.5 million-scale United States wall map was published using the up-to-date (1978) boundaries and codes.

Based on the above summary, I would recommend using the boundaries and codes from the 1:2.5 million-scale map and the 1:2,000,000 digital data set. Please be aware that other hydrologic unit boundaries and/or codes may have been revised when individual State HUMs were reprinted by OWDC. I doubt if there has been any attempt to update any of the digital data sets with these changes."

Response to Peer Review by Paul Kapinos, Doug Nebert 2/14/94: -------------------------------------------------------------

The areas in question in California were updated to reflect the more current information as contained in the 1:2 million data set. Polygon hydrologic unit codes were updated in the Central Valley and in coastal Southern California. Where necessary, 1:2 million-scale linework was substituted to define the correct basin boundaries where no corresponding information was available at a different scale.

Related_Spatial_and_Tabular_Data_Sets: Any data set which has hydrologic unit codes as part of their data may be able to use this data.

Other_References_Cited:

U.S. Geological Survey, 1990. Land Use and Land Cover Digital Data from 1:250,000- and 1:100,000-Scale Maps. Data Users Guide 4, 33 pp, Reston Virginia.

Notes:

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Currentness_Reference:
(Here you put information defining how the time period of content information, on the DOC file, was determined)
Status:
Progress: Complete
Maintenance_and_Update_Frequency:
(Here you pick one of the following entries that describes how often changes or additions are made to the data set. Pick one, and delete the rest)

Continually Daily Weekly Monthly Annually Unknown As Needed Irregular None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.017560
East_Bounding_Coordinate: -111.286673
North_Bounding_Coordinate: 44.011221
South_Bounding_Coordinate: 33.421560
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: hydrologic unit
Theme_Keyword: watersheds
Theme_Keyword: inlandWaters
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Conterminous United States
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: None
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: None
Access_Constraints:
(describe any restrictions or legal prerequisites for accessing the data set. Put "None" if there are no restrictions)
Use_Constraints:
These data were digitized at a scale of 1:250,000 with some portions of coverage at 1:100,000- and 1:2 million scale. Limitations of the data strictly revolve around this scale input. Use of these boundaries with larger scale data (i.e. 1:24k hydrography) is not recommended as it would be beyond the resolution capabilities of the data set.
Data_Set_Credit:
(Here you acknowledge the agencies and organizations that gave you money, resources, and encouragement to digitize the data and to enter all this wonderful metadata.)
Security_Information:
Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 8.2.0.700

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: See Entity_Attribute_Information
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: See Explanation
Attribute_Accuracy_Explanation:
Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.
Logical_Consistency_Report: Polygon and chain-node topology present.
Completeness_Report:
(Information in wordy narrative form describing omissions, selection criteria, generalization, definitions used, and other rules applied to derive the data set)
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
(An explanation of the accuracy of the horizontal coordinate measurements and a description of tests used, if any, to determine horizontal positional accuracy. This is different from horizontal resolution as reported in the DOC file. Positional accuracy defines how correctly the digital features match real-world features and woiuld be related to the concept of the National Map Accuracy Standard -- xx% of well-defined point features fall within xx units of their true position. The resolution is the smallest unit of measure the GIS can reliably manage without truncation or rounding.)
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: variable
Horizontal_Positional_Accuracy_Explanation: Resolution as reported
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
(The same as above, but for vertical information that may be encoded with the 2-D features such as cell or contour estimates of a vertical dimension. A description of the contour interval of input data and its basis could be described here.)
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Unspecified
Publication_Date: 0000
Title: Unspecified
Source_Scale_Denominator: 250,000 and 100,000
Type_of_Source_Media: Unspecified
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 0000
Source_Currentness_Reference: Unspecified
Source_Citation_Abbreviation: Unspecified
Source_Contribution: Unspecified
Process_Step:
Process_Description: ELIMINATE HUC250E HUC250F KEEPEDGE POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19930107
Process_Time: 0959
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: BUILD HUC250F LINE
Source_Used_Citation_Abbreviation: None
Process_Date: 19930107
Process_Time: 1000
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: RENAME HUC250F HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19930107
Process_Time: 1156
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930107
Process_Time: 1158
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930107
Process_Time: 1237
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description:  
COPY /HOME2A/RESDGS1/DDNEBERT/HUC250/HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19930107
Process_Time: 1245
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: COPY HUC250 /DSDL1/CUSA/TILES/CUSA/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19930111
Process_Time: 0917
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: EXPORT COVER /DSDL1/CUSA/TILES/CUSA/HUC250 HUC250.E00
Source_Used_Citation_Abbreviation: None
Process_Date: 19930113
Process_Time: 1030
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930713
Process_Time: 1210
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
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Process_Time: 1211
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
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Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930713
Process_Time: 1219
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930713
Process_Time: 1225
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930713
Process_Time: 1228
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930713
Process_Time: 1238
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19930713
Process_Time: 1240
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: COPY /DSDL1/CUSA/TILES/CUSA/HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931102
Process_Time: 1403
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931129
Process_Time: 1441
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931130
Process_Time: 1444
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931130
Process_Time: 1458
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931201
Process_Time: 0848
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931201
Process_Time: 0908
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931201
Process_Time: 1317
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931206
Process_Time: 0826
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931206
Process_Time: 1111
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931206
Process_Time: 1436
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931206
Process_Time: 1503
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931207
Process_Time: 0749
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931207
Process_Time: 0825
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931207
Process_Time: 0840
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931208
Process_Time: 1119
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931208
Process_Time: 1123
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931208
Process_Time: 1138
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: TOLERANCE HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931208
Process_Time: 1427
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: CLEAN HUC250 HUC250C 50 10
Source_Used_Citation_Abbreviation: None
Process_Date: 19931208
Process_Time: 1509
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: LABELERRORS HUC250C
Source_Used_Citation_Abbreviation: None
Process_Date: 19931214
Process_Time: 0753
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: ARCEDIT /DSDL2/JPORTER/HUC250C
Source_Used_Citation_Abbreviation: None
Process_Date: 19931214
Process_Time: 0836
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: BUILD HUC250C
Source_Used_Citation_Abbreviation: None
Process_Date: 19931214
Process_Time: 0843
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: LABELERRORS HUC250C
Source_Used_Citation_Abbreviation: None
Process_Date: 19931214
Process_Time: 0843
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: CENTROIDLABELS HUC250C INSIDE
Source_Used_Citation_Abbreviation: None
Process_Date: 19931214
Process_Time: 0850
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: RENAME HUC250C HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19931220
Process_Time: 1410
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 0934
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1007
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1105
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1153
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1222
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1235
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1324
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1341
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1401
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1416
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1422
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1426
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19931221
Process_Time: 1430
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: IMPORT COVER HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19940117
Process_Time: 1651
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19940117
Process_Time: 1716
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19940117
Process_Time: 1744
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: DOCUMENT HUC250 UPDATE DDNEBERT
Source_Used_Citation_Abbreviation: None
Process_Date: 19940307
Process_Time: 1259
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: EXPORT COVER HUC250 /DSDL1/CUSA/DATABASE/WAIS/HUC250.E00
Source_Used_Citation_Abbreviation: None
Process_Date: 19940411
Process_Time: 1056
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: EXPORT COVER /DSDL1/CUSA/TILES/CUSA/HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19940411
Process_Time: 1546
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: EXPORT COVER HUC250 HUC250_CUSA.E00
Source_Used_Citation_Abbreviation: None
Process_Date: 19941017
Process_Time: 1112
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description:
JPORTER COPY /DSDL1/CUSA/TILES/CUSA/HUC250 /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1045
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1242
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1246
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1300
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1303
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1308
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1311
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1408
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19941220
Process_Time: 1411
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19941221
Process_Time: 1043
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19941221
Process_Time: 1107
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941221
Process_Time: 1245
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19941221
Process_Time: 1248
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19941221
Process_Time: 1441
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19941221
Process_Time: 1444
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER EXPORT COVER /HOME/GIS/JPORTER/HUC/HUC250 HUC250.DEC
Source_Used_Citation_Abbreviation: None
Process_Date: 19941222
Process_Time: 1203
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER EXPORT COVER /HOME/GIS/JPORTER/HUC/HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950120
Process_Time: 0821
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 0910
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER CLEAN HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 0930
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1010
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1012
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1015
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1033
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1036
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1050
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1053
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1115
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1118
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1356
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1400
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1408
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1411
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER IDEDIT HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19950127
Process_Time: 1544
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19950130
Process_Time: 1022
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER EXPORT COVER /HOME/GIS/JPORTER/HUC/HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950131
Process_Time: 1013
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER ARCEDIT /HOME/GIS/JPORTER/HUC/HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950410
Process_Time: 1033
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER BUILD HUC250 POLY
Source_Used_Citation_Abbreviation: None
Process_Date: 19950410
Process_Time: 1038
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER DOCUMENT HUC250 UPDATE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19950410
Process_Time: 1048
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: JPORTER DOCUMENT HUC250 DELETE JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19950410
Process_Time: 1049
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description:
JPORTER DOCUMENT HUC250 COPY /DSDL1/CUSA/TILES/CUSA/HUC250 JPORTER
Source_Used_Citation_Abbreviation: None
Process_Date: 19950410
Process_Time: 1051
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: MNEGRI COPY ~JPORTER/HUC/HUC250 HUC250
Source_Used_Citation_Abbreviation: None
Process_Date: 19950411
Process_Time: 1310
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: MNEGRI ARCSDTS HUC250 HUC250SDTS.TGZ PREF
Source_Used_Citation_Abbreviation: None
Process_Date: 19950411
Process_Time: 1424
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: MNEGRI ARCSDTS HUC250 HUC250.SDTS.TGZ PREF
Source_Used_Citation_Abbreviation: None
Process_Date: 19950412
Process_Time: 0920
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: MNEGRI EXPORT COVER HUC250 HUC250.E00
Source_Used_Citation_Abbreviation: None
Process_Date: 19950412
Process_Time: 0932
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: MNEGRI EXPORT COVER HUC250 HUC250.E00
Source_Used_Citation_Abbreviation: None
Process_Date: 19950428
Process_Time: 0832
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: MNEGRI ARCSDTS HUC250 HUC250.SDTS.TGZ PREF
Source_Used_Citation_Abbreviation: None
Process_Date: 19950428
Process_Time: 0951
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description:
MNEGRI EXPORT COVER HUC250 /SCRATCH_AREA1/MNEGRI/HUC250.E00 NONE
Source_Used_Citation_Abbreviation: None
Process_Date: 19950919
Process_Time: 1725
Source_Produced_Citation_Abbreviation: None
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: D:\NevadaDataBrowser\ecoregion_bnd\nv250k_hucs.xml
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: D:\NevadaDataBrowser\ecoregion_bnd\nv250hucs\metadata.xml

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 72
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 72
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 72
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 29.500000
Standard_Parallel: 45.500000
Longitude_of_Central_Meridian: -96.000000
Latitude_of_Projection_Origin: 23.000000
False_Easting: 0.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.002048
Ordinate_Resolution: 0.002048
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: nv_250hucs
Entity_Type_Definition: HUC POLYGONS
Entity_Type_Definition_Source: GIRAS DATA
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of feature in internal units.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: HUC250K_
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: No restrictions
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: HUC250K_ID
Attribute_Definition: User-defined feature number.
Attribute_Definition_Source: ESRI
Attribute:
Attribute_Label: HUC
Attribute:
Attribute_Label: REG
Attribute:
Attribute_Label: SUB
Attribute:
Attribute_Label: ACCT
Attribute:
Attribute_Label: NAME
Attribute:
Attribute_Label: REGION
Attribute:
Attribute_Label: SUBREGION
Attribute:
Attribute_Label: ACCTUNIT
Attribute:
Attribute_Label: HYDROUNIT
Attribute:
Attribute_Label: XHUC
Attribute:
Attribute_Label: XREG
Attribute:
Attribute_Label: XSUB
Attribute:
Attribute_Label: XACCT
Attribute:
Attribute_Label: XSUB
Attribute:
Attribute_Label: XACCT
Detailed_Description:
Entity_Type:
Entity_Type_Label: HUC250.AAT
Entity_Type_Definition: HYDROLOGIC UNIT LINEWORK
Entity_Type_Definition_Source: GIRAS DATA
Attribute:
Attribute_Label: ' FNODE#'
Attribute_Definition: Internal number of from-node
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: ' TNODE#'
Attribute_Definition: Internal number of to-node
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: ' LPOLY#'
Attribute_Definition: Internal number of polygon to left of arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: RPOLY#
Attribute_Definition: Internal number of polygon to right of arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: LENGTH
Attribute_Definition: Length of arc in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Positive real numbers
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: HUC250#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sequential unique positive integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: HUC250-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: SOURCE
Attribute_Definition: LINE CODING FOR UNIQUE CASES
Attribute_Definition_Source: GIRAS AND 1:2M DLG DATA
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1=100K 2=250K 3=250K EDGE 4=2MILLION DLG
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Detailed_Description:
Entity_Type:
Entity_Type_Label: HUC250.LEFTRIGHT
Entity_Type_Definition: Names of Hydrologic Cataloging Units (HUC)
Entity_Type_Definition_Source: U.S. Geological Survey, Office of Water Data Coordination
Attribute:
Attribute_Label: HUC
Attribute_Definition: Hydrologic Unit Code
Attribute_Definition_Source: U.S. Geological Survey as FIPS standard
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer 8-digit codes defined uniquely for each basin
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Attribute:
Attribute_Label: NAME
Attribute_Definition: Hydrologic Unit Name
Attribute_Definition_Source: U.S. Geological Survey as FIPS standard
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Integer 8-digit codes defined uniquely for each basin
Enumerated_Domain_Value_Definition: unspecified
Enumerated_Domain_Value_Definition_Source: unspecified
Overview_Description:
Entity_and_Attribute_Overview:
For definition of drainage basins, there are two principal tabular data elements of interest. The first, "HUC", stands for the Hydrologic Unit Code and includes the 8-digit cataloging unit as assigned to the basin polygon by the U.S. Geological Survey. The second item, "SOURCE", is an attribute of each bounding line segment (arc) and incorporates a code to define the source and scale of the source linework. Because this data set includes linework from different scale sources, it is important to recognize the presence and use of this item in quality evaluation.

The SOURCE item has four special codes to describe the source linework. Code 1 stands for all arcs that were from 1:100,000 scale GIRAS files and were internal to the quadrangle (no neatlines). Code 2 stands for all arcs from the 1:250,000-scale GIRAS files which were internal to the quadrangle. Code 3 is for lines from either GIRAS source scale but were part of the neatline which may be used to connect arcs that dont join cleanly between quads. Code 4 is for linework in the southern Central Valley and southern Coastal California where the GIRAS data were replaced with 1:2 million scale basin boundaries.

A companion NAMES file (HUC250.NAMES) is provided with this data set to allow a user to perform a temporary join between the basin polygons and display or query basins based on their assigned text names rather than just the basin number (HUC).

Entity_and_Attribute_Detail_Citation: Not Available

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Position: Ask USGS - Water Webserver Team
Contact_Address:
Address_Type: mailing
Address: 507 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)
Contact_Electronic_Mail_Address: <http://water.usgs.gov/user_feedback_form.html>
Resource_Description: Downloadable Data
Distribution_Liability:
Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials.

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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Fees: None. This dataset is provided by USGS as a public service.

Metadata_Reference_Information:
Metadata_Date: 20050406
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: REQUIRED: The person responsible for the metadata information.
Contact_Position: Ask USGS -- Water Webserver Team
Contact_Address:
Address_Type: mailing
Address: 507 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)
Contact_Electronic_Mail_Address: <http://water.usgs.gov/user_feedback_form.html>
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

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