20171219
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1.0
FGDC CSDGM Metadata
FALSE
Tract30Ply
389647.855000
407860.217000
126006.166000
147464.165000
1
002
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_StatePlane_Maryland_FIPS_1900
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20210827
21455400
20210827
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ISO19139
D.C. Office of the Chief Technology Officer
GIS Data Coordinator
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
ArcGIS Metadata
1.0
D.C. Office of the Chief Technology Officer
GIS Data Coordinator
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
DC datasets can be downloaded from "http://opendata.dc.gov".
Feature Class
Census Tracts - 1930
2002-06-12T00:00:00
2018-01-05T00:00:00
DC GIS
Office of the Chief Technology Officer
DC Geographic Information System
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Census Year 1930 Census Tracts. The dataset contains polygons representing CY 1930 census tracts, created as part of the D.C. Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. Census tracts were identified from maps provided by the U.S. Census Bureau and the D.C. Office of Planning. The tract polygons were created by selecting street arcs from the WGIS planimetric street centerlines. Where necessary, polygons were also heads-up digitized from 1995/1999 orthophotographs. METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.</SPAN></P></DIV></DIV></DIV>
This data is used for the planning and management of Washington, D.C. by local government agencies.
D.C. Office of Planning, U.S. Census Bureau
D.C. Office of the Chief Technology Officer
GIS Data Coordinator
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
District of Columbia
DCGIS
DC GIS
DC
Washington
D.C.
society
Government Jurisdiction
boundary
Census
Tract
Census Tract
Open Data
Washington DC
DC GIS
District of Columbia
Demographic
People
society
Census
Washington
D.C.
Government Jurisdiction
DC
Census Tract
Tract
DCGIS
boundary
DC Geographic Information System
DC GIS
vector digital data
ground condition
1930-01-01
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This work is licensed under a </SPAN><A href="http://creativecommons.org/licenses/by/4.0/"><SPAN>Creative Commons Attribution 4.0 International License</SPAN></A><SPAN>.</SPAN></P></DIV></DIV></DIV>
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
1
-77.119501
-76.909265
38.995117
38.801755
In process of validation by source and/or responsible agency.
Data believed to be complete and accurate, subject to change. Digital version compared with original source data for accuracy and completeness.In process of validation by source and/or responsible agency.
Data believed to be complete and accurate as of the time period cited. Subject to change. Digital version compared with original source data for accuracy and completeness. In process of validation by source and/or responsible agency.
In process of validation by source and/or responsible agency.
N/A
boundaries and attributes
1930 Census tract map
1930 Census tract map
1931-01-01
US Census Bureau
map
From 15th Census of the United States, 1930. Population of the District of Columbia.
publication date
1930 Census tracts were identified from public records (U.S. Census Bureau and D.C. Office of Planning) and initially created by selecting street arcs from the WGIS planimetric street centerlines. Where necessary, tracts were also heads-up digitized from 1995 orthophotographs. The digitized arcs and polygons were converted to shapefiles. The census tract datasets were selected using the shapefile from the snapbase coverage, creating coincident geography with the other DC GIS datasets. Digitized lines lacking a corresponding planimetric feature were retained. Snapbase arc attributes were populated with appropriate census designations. These planimetric features were built as lines and converted to polygons. Census coverages from each census year were built together since they share topology. Planimetrics were created at a scale of 1:1,000. This means that a well defined feature falls within two feet of true position. When imported into the DC GIS geodatabase, the coverages shift 0.01mm since the geodatabase supports only 11 digits of precision, not double precision (16 digits). Line coverages, containing the polygon bounding attributes, accompany all polygons and are made available for editing and updating purposes. Census tracts are the only line coverages used to build polygons which carry attributes. Attribute data, kept in separate tables, was provided by US Census Bureau and the DC Office of Planning. In this case, street names were maintained at the request of the Office of Planning for ease of labeling. All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.
2001-08-06T00:00:00
GIS Data Coordinator
D.C. Office of the Chief Technology Officer
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20001
US
dcgis@dc.gov
8:30 am - 5:00 pm
Staff updated the dataset using the lastest layer from OP
2018-01-05T00:00:00
external
8dd16495474f6e821ebab63fff079c2c
D.C. Office of the Chief Technology Officer
GIS Data Coordinator
(202) 727-5660
200 I Street SE, 5th Floor
Washington
DC
20003
US
dcgis@dc.gov
8:30 am - 5 pm
True
GIS Data Coordinator
dataset
EPSG
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Tract30Ply
Feature Class
0
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
NHGISST
NHGISST
String
3
0
0
NHGISCTY
NHGISCTY
String
4
0
0
GISJOIN
GISJOIN
String
16
0
0
GISJOIN2
GISJOIN2
String
15
0
0
SQMI
Square Miles
Double
8
38
8
CENSUS_YEAR
Census Year
Double
8
38
8
STATE_NAME
State Name
String
255
0
0
TRACT_NUMBER
Tract Number
Double
8
38
8
TRACT_NAME
Tract Name
String
255
0
0
BRQ001
Total Population
Double
8
38
8
BRV001
Age: Under 5 years old
Double
8
38
8
BRV002
Age: 5 to 14 years old
Double
8
38
8
BRV003
Age: 15 to 20 years old
Double
8
38
8
BRV004
Age: 21 to 24 years old
Double
8
38
8
BRV005
Age: 25 to 34 years old
Double
8
38
8
BRV006
Age: 35 to 44 years old
Double
8
38
8
BRV007
Age: 45 to 64 years old
Double
8
38
8
BRV008
Age: 65 years and over
Double
8
38
8
BRV008P
Age: Percent 65 years and over
Double
8
38
8
BRR001
Male
Double
8
38
8
BRR002
Percent Male
Double
8
38
8
BRR003
Female
Double
8
38
8
BRR004
Percent Female
Double
8
38
8
BRS001
White
Double
8
38
8
BRS001P
Percent White
Double
8
38
8
BRT004
Black
Double
8
38
8
BRT004P
Percent Black
Double
8
38
8
BRT005
Other races
Double
8
38
8
BRT005P
Percent Other races
Double
8
38
8
BRV009
Unknown race
Double
8
38
8
BRV009P
Percent Unknown race
Double
8
38
8
BRT001
White: Native white persons with native white parent
Double
8
38
8
BRT002
White: Native white persons with foreign born or mixed parents
Double
8
38
8
BRT003
White: Foreign born whites
Double
8
38
8
BRX001
Total Families
Double
8
38
8
SHAPE
SHAPE
Geometry
4
0
0
Feature geometry.
Esri
Coordinates defining the features.
SE_ANNO_CAD_DATA
SE_ANNO_CAD_DATA
Blob
0
0
0
GIS_ID
GIS_ID
String
50
0
0
OCTO GIS sequential identifier
OCTO
CREATOR
CREATOR
String
255
0
0
A user who created a record.
OCTO
CREATED
CREATED
Date
8
0
0
The dates a record were created
OCTO
EDITOR
EDITOR
String
255
0
0
A user who last edited a record.
OCTO
EDITED
EDITED
Date
8
0
0
The dates a record were last edited.
OCTO
SHAPE.AREA
SHAPE.AREA
Double
0
0
0
SHAPE.LEN
SHAPE.LEN
Double
0
0
0