Census Tracts - 1950
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: DC GIS
- Publication_Date: 20020214
- Title: Census Tracts - 1950
- Geospatial_Data_Presentation_Form: vector digital data
- Online_Linkage: \\10.34.70.24\data\Data_Load.gdb
- Larger_Work_Citation:
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- Citation_Information:
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- Originator: DC GIS
- Title: DC Geographic Information System
- Geospatial_Data_Presentation_Form: vector digital data
- Description:
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- Abstract:
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Census Year 1950 Census Tracts. The dataset contains polygons representing CY 1950 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.
All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.
METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.
- Purpose:
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This data is used for the planning and management of Washington, D.C. by local government agencies.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 1950
- Currentness_Reference: ground condition
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -77.119898
- East_Bounding_Coordinate: -76.909119
- North_Bounding_Coordinate: 38.995902
- South_Bounding_Coordinate: 38.791633
- Data_Set_G-Polygon:
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- Data_Set_G-Polygon_Outer_G-Ring:
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- G-Ring_Point:
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: none
- Theme_Keyword: Government jurisdictions
- Theme_Keyword: Census Tracts
- Theme_Keyword: Census
- Theme_Keyword: Tracts
- Place:
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- Place_Keyword: Washington, D.C.
- Place_Keyword: District of Columbia
- Place_Keyword: DC
- Place_Keyword: DC GIS
- Place_Keyword: DCGIS
- Access_Constraints:
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Contact OCTO GIS. Any data obtained outside of OCTO GIS are unauthorized copies.
- Use_Constraints:
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For data terms and conditions, go to <http://dc.gov/page/terms-and-conditions-use-district-data>
- Point_of_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: D.C. Office of the Chief Technology Officer
- Contact_Person: GIS Data Coordinator
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: 441 4th St NW
- City: Washington
- State_or_Province: DC
- Postal_Code: 20001
- Country: USA
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 10 am - 5 pm
- Data_Set_Credit:
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D.C. Office of Planning
U.S. Bureau of the Census
- Native_Data_Set_Environment:
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Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.4000
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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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.
- Logical_Consistency_Report: In process of validation by source and/or responsible agency.
- Completeness_Report:
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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.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report: In process of validation by source and/or responsible agency.
- Vertical_Positional_Accuracy:
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- Vertical_Positional_Accuracy_Report: N/A
- Lineage:
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- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator:
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United Community Services, Department of Research and Statistics
- Publication_Date: 1956
- Title: District of Columbia Census Tracts 1950
- Geospatial_Data_Presentation_Form: map
- Source_Scale_Denominator: 64000
- Type_of_Source_Media: paper
- Source_Time_Period_of_Content:
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- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: 1950 District of Columbia Census Tracts
- Source_Contribution: boundaries and attributes
- Process_Step:
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- Process_Description:
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1950 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.
- Process_Date: 20010806
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: D.C. Office of the Chief Technology Officer
- Contact_Person: GIS Data Coordinator
- Contact_Address:
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- Address: 200 I Street SE, 5th Floor
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 10 am - 5 pm
- Process_Step:
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- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: C:\DOCUME~1\fieldm\LOCALS~1\Temp\xml9812.tmp
- Process_Date: 20120515
- Process_Time: 14022000
- Process_Contact:
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- Contact_Information:
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- Contact_Address:
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- Address: 200 I Street SE, 5th Floor
- Spatial_Data_Organization_Information:
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- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: G-polygon
- Point_and_Vector_Object_Count: 0
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Grid_Coordinate_System:
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- Grid_Coordinate_System_Name: State Plane Coordinate System
- State_Plane_Coordinate_System:
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- SPCS_Zone_Identifier: 1900
- Lambert_Conformal_Conic:
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- Standard_Parallel: 38.300000
- Standard_Parallel: 39.450000
- Longitude_of_Central_Meridian: -77.000000
- Latitude_of_Projection_Origin: 37.666667
- False_Easting: 400000.000000
- False_Northing: 0.000000
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.000100
- Ordinate_Resolution: 0.000100
- Planar_Distance_Units: meters
- Geodetic_Model:
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- 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
- Vertical_Coordinate_System_Definition:
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- Altitude_System_Definition:
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- Altitude_Resolution: 1.000000
- Altitude_Encoding_Method:
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Explicit elevation coordinate included with horizontal coordinates
- Entity_and_Attribute_Information:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: Tract50Ply
- Attribute:
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- Attribute_Label: SHAPE
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: Shape
- Attribute_Definition: Coverage artifact
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: OBJECTID
- Attribute_Definition: Unique id
- Attribute:
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- Attribute_Label: TRACTNO
- Attribute_Definition: census tract number
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: SHAPE_Leng
- Attribute:
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- Attribute_Label: Pop_1950
- Attribute:
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- Attribute_Label: Shape_Length
- Attribute_Definition: Length of feature in internal units.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
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- Attribute_Label: Shape_Area
- Attribute_Definition: Area of feature in internal units squared.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
-
- Contact_Organization: D.C. Office of the Chief Technology Officer
- Contact_Person: GIS Data Coordinator
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 200 I Street SE, 5th Floor
- City: Washington
- State_or_Province: DC
- Postal_Code: 20001
- Country: USA
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 10 am - 5 pm
- Contact_Instructions: [email protected]
- Resource_Description: Downloadable Data
- Distribution_Liability:
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For data terms and conditions, go to <http://dc.gov/page/terms-and-conditions-use-district-data>
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Transfer_Size: 0.506
- Digital_Transfer_Option:
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- Online_Option:
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- Computer_Contact_Information:
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- Network_Address:
- Ordering_Instructions: All data is available at <http://opendata.dc.gov>
- Metadata_Reference_Information:
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- Metadata_Date: 20120514
- Metadata_Review_Date: 01/07/04
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: D.C. Office of the Chief Technology Officer
- Contact_Person: GIS Data Coordinator
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 200 I Street SE, 5th Floor
- City: Washington
- State_or_Province: DC
- Postal_Code: 20001
- Country: USA
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 10 am - 5 pm
- Contact_Instructions: email
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Access_Constraints: None.
- Metadata_Use_Constraints: None.
- Metadata_Extensions:
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- Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.12 on Thu Jun 25 14:59:53 2015