Mayor Vincent C. Gray

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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

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Coordinate System Standards 

For horizontal coordinates, the standard is the Maryland state plane coordinate system of the American Datum of 1983 (NAD83), as updated in 1991. For vertical coordinates, the standard is the North American Vertical Datum of 1988 (NAVD88). Coordinates are stored in meters.

For more information on this topic, or assistance with re-projecting geographic datasets, please contact the DC GIS program.


Service Need

Aligning datasets with matching coordinate systems to ensure data consistency accross desktop and web mapping applications.

Service at a Glance

Provided By: OCTO
Phone: (202) 727-1761
Frequency: Every Day
Location: 200 I Street SE, 5th Floor Washington, DC 20003