4.5        Coordinate System

Horizontal spatial data shall be submitted to, maintained by, and provided by MDOT MAA in the Maryland Coordinate System of 1983, also referred to as Maryland State Plane. Following are the parameters of the Maryland Coordinate System of 1987:

Map Projection:              Lambert conic conformal projection of the geodetic reference system of 1980

Horizontal Datum:         NAD83 (2001)

Latitude of Origin*:        37°40 North latitude

Central Meridian:           77°00' West longitude

Standard Parallel 1:       38°18' North latitude

Standard Parallel 2:       39°27' North latitude

False Easting*:                400,000 meters

False Northing*:             0 meters

Latitude**:                      37°34' 38.14264" N

Longitude**:                   81°31' 45.07877" W

* at the 77P^thP meridian

** at artificial origin (0,0)

Vertical spatial data shall be submitted to, maintained by, and provided by MDOT MAA based on the National Geodetic Vertical Datum of 1988 (NGVD88).

All units for both horizontal and vertical data will be the U.S. Survey Foot (1200/3937 meters).

Please note that the database coordinate system is not the same as that used by the Survey Control Manual.