Zip Codes
Metadata also available as
Metadata:
- Identification_Information:
-
- Citation:
-
- Citation_Information:
-
- Originator: US Postal Service
- Publication_Date: 20130704
- Title: Zip Codes
- Geospatial_Data_Presentation_Form: vector digital data
- Publication_Information:
-
- Publisher: DC GIS
- Online_Linkage: \\10.82.20.231\e$\Data_Load.gdb
- Online_Linkage: \\10.82.20.231\e$\Data_Load.gdb
- Larger_Work_Citation:
-
- Citation_Information:
-
- Originator: DC GIS
- Title: DC Geographic Information System
- Geospatial_Data_Presentation_Form: vector digital data
- Description:
-
- Abstract:
-
Zip Codes (5-digit). The dataset polygons represent location and attributes of zip codes, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies.
Zip Codes were identified from public records (US Postal Service) and created selecting arcs from the street centerlines and vector property map.
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:
-
This data is used for the planning and management of Washington, D.C. by local government agencies.
- Supplemental_Information:
-
The five-digit ZIP (Zone Improvement Plan) Code was introduced to the public July 1, 1963, and was viewed as a positive step for improving the productivity of mail distribution during a period of escalating mail volume and expanding delivery stops.
- Time_Period_of_Content:
-
- Time_Period_Information:
-
- Single_Date/Time:
-
- Calendar_Date: 20130704
- Currentness_Reference: publication date
- Status:
-
- Progress: In work
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
-
- Bounding_Coordinates:
-
- West_Bounding_Coordinate: -77.119892
- East_Bounding_Coordinate: -76.909016
- North_Bounding_Coordinate: 38.995969
- South_Bounding_Coordinate: 38.803837
- Data_Set_G-Polygon:
-
- Data_Set_G-Polygon_Outer_G-Ring:
-
- G-Ring_Point:
- Keywords:
-
- Theme:
-
- Theme_Keyword_Thesaurus: none
- Theme_Keyword: boundary
- Theme_Keyword: society
- Theme_Keyword: Postal Service
- Theme_Keyword: location
- Theme_Keyword: Zip Code
- Theme_Keyword: Five Digit Zip Code
- Theme_Keyword: Postal Service
- Place:
-
- Place_Keyword: Washington, D.C.
- Place_Keyword: District of Columbia
- Place_Keyword: DC
- Place_Keyword: DC GIS
- Place_Keyword: DCGIS
- Use_Constraints:
-
For data terms and conditions, go to <http://dc.gov/page/terms-and-conditions-use-district-data>
- Point_of_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: 441 4th St NW, Suite 930 South
- 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: 8:30 am - 5:00 pm
- Data_Set_Credit: US Postal Service
- Native_Data_Set_Environment:
-
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.4000
- Data_Quality_Information:
-
- Attribute_Accuracy:
-
- Attribute_Accuracy_Report:
-
Data believed to be complete and accurate as of the time period cited. Subject to change. Not validated by source and/or responsible agency.
Staff compared the MAR address point to the Zip Code polygons noting the following errors and discrepancies:
1) address points that do not fall in the correct zipcode
2) zipcode polygons that did not follow designated features, such as street centerlines, alleys, and vector property lot lines.
Staff also used the USPS website to research and verify zip codes by address. Topology was used to ensure no overlaps or gaps existed between zip codes. Staff ensured the new unique zip codes were correctly assigned and mapped.
- Logical_Consistency_Report: Not validated by source and/or responsible agency.
- Completeness_Report:
-
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:
-
- Horizontal_Positional_Accuracy:
-
- Horizontal_Positional_Accuracy_Report:
-
The snapbase and vector property map data was used to construct most of the zip codes. Planimetrics compose most of the snapbase. They were captured at a 1:1000 map scale accuracy (well defined points with .83 ft). Since the vector property map is best-fitted to the planimetrics, it is close but not as accurate as the planimetrics.
- Vertical_Positional_Accuracy:
-
- Vertical_Positional_Accuracy_Report: N/A
- Lineage:
-
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: US Postal Service
- Publication_Date: 2001
- Title: Zip Code directory
- Type_of_Source_Media: paper
- Source_Time_Period_of_Content:
-
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: Zip Code directory
- Source_Contribution: attributes
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: Spatial Systems Associates
- Publication_Date: 2001
- Title: DC Property View
- Source_Scale_Denominator: 24000
- Type_of_Source_Media: shapefile
- Source_Citation_Abbreviation: DCPV
- Source_Contribution: boundaries
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: US Postal Service
- Publication_Date: 2005
- Title:
-
Address Information Systems Zip + 4 by State: District of Columbia
- Geospatial_Data_Presentation_Form: spreadsheet
- Online_Linkage: <http://www.usps.com/>
- Type_of_Source_Media: database
- Source_Citation_Abbreviation: Zip + 4 by State
- Source_Contribution: location
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: DC Department of Mental Health
- Publication_Date: 2005
- Title: Medicaid Recipients and Uninsured Population
- Online_Linkage: <http://dmh.dc.gov>
- Type_of_Source_Media: database
- Source_Citation_Abbreviation: DC Department of Mental Health
- Source_Contribution: attribution
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: Smarty Streets
- Publication_Date: 2013
- Title: Smarty Streets
- Geospatial_Data_Presentation_Form: tabular digital data
- Online_Linkage: <http://smartystreets.com/>
- Process_Step:
-
- Process_Description:
-
Zip code lines were identified from existing shapefiles from Spatial Systems Associates. These were intersected with the SIS street center line, transferring attributes to individual arcs. Some arcs remained unattributed, since they crossed zip code boundaries. These arcs were hand attributed and verified from the published USPS zip code list. Polygons were then created from these lines.
Attribute data was provided by United States Postal Service publications and an additional URL from the EPA Enviromapper website.
- Process_Date: 20010806
- Process_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_Voice_Telephone: (202) 727-1761
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 8:30 am - 5:00 pm
- Process_Step:
-
- Process_Description:
-
The Address points from the Master Address Repository (MAR) were matched against the US Postal Service Address Information System (AIS) Zip+4 data product. The Zip+4 data contained 5 digit zip codes for known postal addresses in DC.
Staff developed a custom visual basic, ArcObjects program to assign the addresses in the MAR with the 5 digit Zip Code from AIS Zip+4 data, matching on address. The program successfully matched and assigned 91% of the addresses in the MAR.
Zip codes were originally created using centerlines. Using the MAR points with assigned zip codes, staff recreated and moved the zip code boundaries where zip codes occurred on both sides of the streets. The zipcode boundaries were snapped to the snapbase, alleyways, and vector property lot lines. New unique zip codes were added to the original zip code boundaries. PO box zip codes were created where the respective post office is located.
After QA/QC, staff updated zip code boundaries based on error resolution and research findings. Several new unique zip code polygons were created and deleted as well.
- Process_Date: 8/01/2005
- Process_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: 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: 8:30am - 5:30pm
- Process_Step:
-
- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: E:\DCGISDATA_WORKSPACE\USPS\ZipCodePly_old.shp.xml
- Process_Step:
-
- Process_Description:
-
Medicaid recipient and uninsured population data was added from data provided by the DC Department of Mental Health.
- Process_Date: 08/30/06
- Process_Contact:
-
- Contact_Information:
-
- Contact_Person_Primary:
-
- Contact_Person: GIS Data Coordinator
- Contact_Organization: Office of the Chief Technology Officer
- 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: 8:30am - 5:30pm
- Process_Step:
-
- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: C:\temp\ZipCodePly.xml
- Process_Step:
-
- Process_Description: Dataset copied.
- Source_Used_Citation_Abbreviation: Server=10.2.11.14; Service=5151; User=sde; Version=SDE.DEFAULT
- Process_Step:
-
- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: C:\temp\zip.xml
- Process_Step:
-
- Process_Description:
-
Staff obtained a list of zip codes from the US Postal Services and updated the zip code layer. For unique zip codes, those assigned to buildings, agencies, etc, staff used the USPS website and web research to determine where the zip code was located. If the USPS website indicated that an address had a unique zip code as its primary zip code, the bulding polygon containing the address point was captured. If the unique zip code was not the primary zip code, a polygon was drawn inside the building polygon.
- Process_Date: 20080315
- Process_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: OCTO
- Process_Step:
-
- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: W:\DCGISDATA_WORKSPACE\usps\ZipCodePly.shp.xml
- Process_Step:
-
- Process_Description:
-
Merged zip codes 20336 and 20332 with 20032. Resolved topology errors.
- Process_Date: 20090325
- Process_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: OCTO
- Process_Step:
-
- Process_Description:
-
Updated a small part of the zip code with alterations based on zip code information acquired from smarty streets data. The DC address repository was run against the smarty streets data to geenerate zip code information at the address point level. This data was compared against the original zip code file and changes were made based on the exceptions.
- Process_Date: 20130704
- Process_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: OCTO
- Spatial_Data_Organization_Information:
-
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
- Spatial_Reference_Information:
-
- Horizontal_Coordinate_System_Definition:
-
- Planar:
-
- Planar_Coordinate_Information:
-
- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
-
- Abscissa_Resolution: 0.000100
- Ordinate_Resolution: 0.000100
- 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
- Vertical_Coordinate_System_Definition:
-
- Altitude_System_Definition:
-
- Altitude_Resolution: 0.000100
- Altitude_Encoding_Method:
-
Explicit elevation coordinate included with horizontal coordinates
- Entity_and_Attribute_Information:
-
- Detailed_Description:
-
- Entity_Type:
-
- Entity_Type_Label: DCGIS.ZipCodePly
- Attribute:
-
- Attribute_Label: TYPE
- Attribute_Definition: Zip code type
- Attribute:
-
- Attribute_Label: Shape
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
-
- Attribute_Label: ZIPCODE
- Attribute_Definition: Zip Code value
- Attribute:
-
- Attribute_Label: GIS_ID
- Attribute_Definition: OCTO GIS sequential identifier
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain:
-
Sequential unique whole numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: OBJECTID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain:
-
Sequential unique whole numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: EPA_URL
- Attribute_Definition: EPA web link url with zip code map
- Attribute:
-
- Attribute_Label: NAME
- Attribute_Definition: Name of feature or agency the Zip Code represents.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
-
- Attribute_Label: SHAPE
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
-
- Attribute_Label: MEDICAID_RECIPIENT
- Attribute:
-
- Attribute_Label: WEB_URL
- Attribute_Definition: Web Link URL
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: ZIP_CODE_TEXT
- Attribute_Definition: Zip code text format
- Attribute:
-
- Attribute_Label: UNINSURED_POPULATION
- Attribute_Definition: Length of feature in internal units.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: SE_ANNO_CAD_DATA
- Attribute:
-
- Attribute_Label: SHAPE.AREA
- Attribute:
-
- Attribute_Label: SHAPE.LEN
- Distribution_Information:
-
- Distributor:
-
- 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_Voice_Telephone: (202) 727-1761
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 8:30 am - 5:00 pm
- Contact_Instructions: [email protected]
- Resource_Description: Downloadable Data
- Distribution_Liability:
-
For data terms and conditions, go to <http://dc.gov/page/terms-and-conditions-use-district-data>
- Standard_Order_Process:
-
- Digital_Form:
-
- Digital_Transfer_Information:
-
- Transfer_Size: 0.668
- Digital_Transfer_Option:
-
- Online_Option:
-
- Computer_Contact_Information:
-
- Network_Address:
- Ordering_Instructions: All data is available at <http://opendata.dc.gov>
- Metadata_Reference_Information:
-
- Metadata_Date: 20130704
- Metadata_Review_Date: 02/03/06
- 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_Voice_Telephone: (202) 727-1761
- Contact_Facsimile_Telephone: (202) 727-5660
- Contact_Electronic_Mail_Address: [email protected]
- Hours_of_Service: 8:30 am - 5:00 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:
-
- 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 15:32:10 2015