Zip Codes

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

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