Metadata - U.S.A. Hydrologic Units (8-digit HUCs)

GEODATASET NAME: GLSHUCUSA

IDENTIFICATION INFORMATION

Description:
    Catalog units (8-digit HUCs) comprising the Great Lakes SOLEC
    (GLS) study area HUC-based spatial reporting units.
Abstract:
    1:250K-scale 8-digit HUC subbasins for processing and reporting 
    on the suite of GLS landscape metrics using the ATtILA, 
    PatchAnalyst, and Soil/Landform metric modules.
Data Type:
    Coverage, polygon
Data Originator:
    U.S. Geological Survey
    Reston, VA
Data Processors:
    Rick Van Remortel, Ed Evanson, Lee Bice
    Lockheed Martin Environmental Services
    1050 E. Flamingo Road, Suite E120
    Las Vegas, NV 89119
    (702)897-3295
    rvanremo@lmepo.com
Data Provider:
    Ricardo Lopez, Ph.D.
    U.S. Environmental Protection Agency
    National Exposure Research Laboratory
    P.O. Box 93478
    Las Vegas, NV 89193-3478
    (702)798-2394
    lopez.ricardo@epa.gov
Keywords:
    Great Lakes, SOLEC, hydrologic unit codes, catalog units
Version:
    N/A
Status:
    Interim
Revision Number:
    0
Series Name:                    
Online Link (URL):              
Time Period of Content:
Use Constraints:
Purpose:
    GLS data analysis
Date of metadata entry/update:
    06/03/2004
 
No Publication Information Available
No File Security Information Available
  
DATA QUALITY INFORMATION
 
Cloud Cover:
    Not applicable
Software:
    ArcGIS Workstation 8.2 ArcInfo and Grid
Operating System:
    WindowsXP on PC
Path Name:
    v:\solec\gds\glshucusa
Logical Consistency Report:
    Not presently available
Completeness Report:
    Not presently available
Horizontal Positional Accuracy:
    Not presently available
Vertical Positional Accuracy:
    Not presently available
Attribute Accuracy:
    Not presently available
Procedures:
    This coverage of 116 catalog units (8-digit HUCs or subbasins) 
    were extracted from the USGS HUCs coverage to define the GLS study 
    area. 1) The consensus at the beginning of the project was there 
    was no perfect method for defining the 'exact' extent of the Great 
    Lakes region because of the lack of a common (shared) spatial 
    reporting unit for the U.S. and Canada.  A conservative approach 
    would have included all Huc8s or Subsubs that drain an area upstream 
    of the mouth of Lake Ontario proper (i.e., excluding the St. Lawrence 
    Seaway and its immediate tributaries).  A more liberal approach would 
    have included all Huc8s and Subsubs that drain an area more-or-less 
    upstream of the western outskirts of Montreal, including the Ottawa 
    River watershed.  Neither of these options were graphically appealing, 
    as they don't offer a suitable 'pour point' that defines the mouth of 
    the basin comparable for both the U.S. and Canada reporting units.  
    A third option was proposed, which would include Huc8s and Subsubs 
    upstream from approximately the midpoint of the above two options, 
    near Cornwall, Ontario.  This option was, in our opinion, more 
    graphically pleasing than the other two, and provided a common 
    pour point and consistent land area basis for the internationally 
    defined study area basin.  It is what was ultimately selected as the 
    basis for our study. Six of the HUCs (04030111, 04050002, 04070003, 
    04100001, 04110003, 04150102) contain multi-polygon features, while 
    five of the HUCs (04020300, 04080300, 04060200, 04120200, 04150200) 
    are dominantly "lake HUCs" (water) and could not be processed during 
    the Soil/Landform metric runs.
Reviews Applied to Data    
    Lockheed Martin Environmental Services internal review
Related Spatial Data Files:
    All geodatasets with gls prefix
Other References Cited:  
Notes:
Update Frequency:
    As needed
 
SPATIAL REFERENCE INFORMATION

               Description of DOUBLE precision coverage glshucusa

                                FEATURE CLASSES

                                    Number of  Attribute     Spatial
Feature Class          Subclass     Features   data (bytes)  Index?   Topology?
-------------          --------     ---------  ------------  -------  ---------
ARCS                                      559        32
POLYGONS                                  117        44      Yes      Yes
NODES                                     444

                               SECONDARY FEATURES

Tics                                        4
Arc Segments                           112892

                                   TOLERANCES

Fuzzy   =                 0.000 V          Dangle  =                 0.000 V

                               COVERAGE BOUNDARY

Xmin =               213000.109            Xmax =              1712183.750
Ymin =              1990383.125            Ymax =              2834680.250

                                     STATUS

The coverage has not been Edited since the last BUILD or CLEAN.

                          COORDINATE SYSTEM DESCRIPTION

Projection               ALBERS
Datum                     NAD83
Units                    METERS             Spheroid                GRS1980
Parameters:
1st standard parallel                                   29 30  0.000
2nd standard parallel                                   45 30  0.000
central meridian                                       -96  0  0.000
latitude of projection's origin                         23  0  0.000
false easting (meters)                                       0.00000
false northing (meters)                                      0.00000

ENTITY AND ATTRIBUTE INFORMATION
Annotation Name:

ATTRIBUTE LISTING FOR: glshucusa.pat

COLUMN   ITEM NAME    WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME  INDEXED?
    1  AREA               8    18     F      5                     -
    9  PERIMETER          8    18     F      5                     -
   17  GLSHUCUSA#         4     5     B      -                     -
   21  GLSHUCUSA-ID       4     5     B      -                     -
   25  HUC                8     8     C      -                     -
   33  REG                2     2     C      -                     -
   35  SUB                4     4     C      -                     -
   39  ACCT               6     6     C      -                     -

METADATA REFERENCE SECTION
 
FGDC Content Standards for Digital Geospatial Metadata
FGDC Standards Version 6/98 / metadata.aml ver. 1.3 5/21/99

SUPPLEMENTAL METADATA (where available)