Northern
California Census Tract Metadata
GEODATASET NAME: NCA_TRCTA83
IDENTIFICATION INFORMATION
Description:
Northern California Pilot Study Area Census Tracts.
Abstract:
Derived from the ESRI California and Oregon Census Tracts dataset. These data
sets are the actual census tracts and BNAs as defined by the Bureau of the Census.
Data Type:
Coverage, polygon
Data Originator:
Environmental Systems Research Institute Inc. (ESRI)
380 New York Street
Redlands CA, 92373-8100
(909) 793-2853
www.esri.com
Data Processor:
Ed Evanson
Lockheed Martin Environmental Services
1050 E. Flamingo Road, Suite E120
Las Vegas, NV 89119
(702)897-3208
eevanson@lmepo.com
Data Provider:
Dan Heggem
U.S. Environmental Protection Agency NERL
P.O. Box 93478
Las Vegas, NV 89193-3478
(702)798-2278
heggem.daniel@epa.gov
Keywords:
Northern California, Pilot Study Area, Census Tracts
Version:
N/A
Status:
Interim
Revision Number:
0
Series Name:
Online Link (URL):
Time Period of Content:
Use Constraints:
None. Acknowledgment of the originating agencies would be appreciated in
products derived from these data.
Purpose:
Northern California data browser
Date of metadata entry/update:
09/06/2001
No Publication Information Available
No File Security Information Available
DATA QUALITY INFORMATION
Cloud Cover:
Not applicable
Software:
Arc/Info 7.2
Operating System:
Unix
Path Name:
/gis/wemap/nca/census_trct
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:
Using Arcview, ESRI Census Tracts for the state of California and Oregon
were
merged and clipped to the Northern California boundary. The resulting
Arcview
Shapefile was converted to an Arc/Info coverage, projected to region
9 Albers projection.
Reviews Applied to Data
Lockheed Martin Environmental Services internal review
Related Spatial Data Files:
All geodatasets with nca_ prefix.
Other References Cited:
Notes:
Update Frequency:
As needed
SPATIAL REFERENCE INFORMATION
Description of DOUBLE precision coverage nca_trcta83
FEATURE CLASSES
Number of Attribute Spatial
Feature Class Subclass Features data (bytes) Index? Topology?
------------- -------- --------- ------------ ------- ---------
ARCS 610
POLYGONS 197 388 Yes
NODES 422
SECONDARY FEATURES
Tics 4
Arc Segments 62878
Polygon Labels 196
TOLERANCES
Fuzzy = 51.383 V Dangle = 0.000 N
COVERAGE BOUNDARY
Xmin = -649332.863 Xmax = -314106.531
Ymin = 4044266.250 Ymax = 4544241.500
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 33 15 0.000
2nd standard parallel 40 15 0.000
central meridian -116 45 0.00
latitude of projection's origin 0 0 0.000
false easting (meters) 0.00000
false northing (meters) 0.00000
ENTITY AND ATTRIBUTE INFORMATION
Annotation Name:
ATTRIBUTE LISTING FOR: nca_trcta83.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 NCA_TRCTA83# 4 5 B - -
21 NCA_TRCTA83-ID 4 5 B - -
25 FIPS 11 11 C - -
36 STATE_FIPS 2 2 C - -
38 CNTY_FIPS 3 3 C - -
41 STCOFIPS 5 5 C - -
46 TRACT 6 6 C - -
52 POP1990 8 9 F 0 -
60 POP1999 8 10 F 0 -
68 POP90_SQMI 8 10 F 1 -
76 HOUSEHOLDS 8 9 F 0 -
84 MALES 8 9 F 0 -
92 FEMALES 8 9 F 0 -
100 WHITE 8 9 F 0 -
108 BLACK 8 9 F 0 -
116 AMERI_ES 8 9 F 0 -
124 ASIAN_PI 8 9 F 0 -
132 OTHER 8 9 F 0 -
140 HISPANIC 8 9 F 0 -
148 AGE_UNDER5 8 9 F 0 -
156 AGE_5_17 8 9 F 0 -
164 AGE_18_29 8 9 F 0 -
172 AGE_30_49 8 9 F 0 -
180 AGE_50_64 8 9 F 0 -
188 AGE_65_UP 8 9 F 0 -
196 NEVERMARRY 8 9 F 0 -
204 MARRIED 8 9 F 0 -
212 SEPARATED 8 9 F 0 -
220 WIDOWED 8 9 F 0 -
228 DIVORCED 8 9 F 0 -
236 HSEHLD_1_M 8 9 F 0 -
244 HSEHLD_1_F 8 9 F 0 -
252 MARHH_CHD 8 9 F 0 -
260 MARHH_NO_C 8 9 F 0 -
268 MHH_CHILD 8 9 F 0 -
276 FHH_CHILD 8 9 F 0 -
284 HSE_UNITS 8 9 F 0 -
292 VACANT 8 9 F 0 -
300 OWNER_OCC 8 9 F 0 -
308 RENTER_OCC 8 9 F 0 -
316 MEDIAN_VAL 8 9 F 0 -
324 MEDIANRENT 8 9 F 0 -
332 UNITS_1DET 8 9 F 0 -
340 UNITS_1ATT 8 9 F 0 -
348 UNITS2 8 9 F 0 -
356 UNITS3_9 8 9 F 0 -
364 UNITS10_49 8 9 F 0 -
372 UNITS50_UP 8 9 F 0 -
380 MOBILEHOME 8 9 F 0 -
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)
Census Tracts: The U.S. Census Tracts data set represents a collection of ESRI
shapefiles that depicts the census tracts for an area. These data sets are the
actual census tracts and BNAs as defined by the Bureau of the Census. Census
tracts are geographic entities within a county having relatively homogeneous
demographic characteristics and a population of 2,500 to 8,000 people. Block
numbering areas follow the same basic criteria as tracts in counties without
formally defined tracts, but because they occur in lightly populated areas they
may have fewer people.
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