Mayor Vincent C. Gray

Search   OCTO


accordian interface begins

About OCTO


Maps & Apps

Agency Support


Office of the Chief Technology Officer

Office Hours
Monday through Friday, 8:30 am - 5:30 pm

How to Reach Us
200 I Street, SE
5th Floor
Washington, DC 20003

Phone: (202) 727-2277
Fax: (202) 727-6857
TTY: 711

FOIA Information
Agency Performance


DC Digital Inclusion 

Rob Mancini
Chief Technology Officer

Ask the Agency

Text Size: A A A Printer-Friendly Version Print   Share Share  

Reasons to Use Web Services 

The DC GIS web services are attractive to many developers and their customers for a number of reasons including cost savings:

  • Services are available in a time and location independent manner (controlled primarily by DC GIS).
  • Embed GIS functionality without paying for it.
  • Providing access to extremely large datasets for both high and low bandwidths.
  • The most current DC GIS data is readily available. Data updates do not require local maintenance.
  • Differences in native formats and coordinate systems are less of a barrier to use.
  • Used in a broad range of situations, from complex projects or applications to one-off uses.

DC GIS web services are most useful when:

  • the user needs the most current data; (e.g MAR addressing database is updated/edited in real-time)
  • the data is subject to frequent change
  • the user just needs the data for background use (e.g our basemap as a backdrop for a map view)
  • the data is not readily available or cannot be efficently acquired, maintained and stored for local use (e.g agency would like to use DC GIS addressing database but does not have the staff or technical resources to host and maintain the data-set

Others reasons include:

  • The need to add a map to an existing web page or application. Developers can tuck a map into an existing web page. It is a map with no zooming/panning tools, but a map generated fresh from the database each time the user loads the page. Or it can have panning/zooming controls. The page is minimally altered and the application can be written in any programming language - as long as it can send and receive XML it can talk to the DCGIS Web Mapping Services.
  • The need to create maps using sensitive data without sharing the data.
  • The application has a function to accept user entered DC addresses and the need for validation is necessary. If so, retrieve the coordinates for that address so that you can map it.


Service Need

Web services are attractive to many developers and their customers for a number of reasons including cost savings and connecting to the most up-to-date datasets.

Service at a Glance

Provided By: OCTO
Location: DC GIS, 801 7th Street, SW Washington, DC 20024