Shoreline Change Map Data for Tidewater Maryland

They are registered to the Maryland State Plane Coordinate System (North American Datum of 83, meters). Spatial Reference Information: -Map Projection Name: Lambert Conformal Conic -Grid Coordinate System Name: State Plane Coordinate System 1983 -SPCS Zone Identifier: 1900 (Maryland) -Planar Distance Units: meters -Horizontal Datum Name: North American Datum of 1983 -Ellipsoid Name: Geodetic Reference System 80 -Semi-major Axis: 6,378,137 meters -Denominator of Flattening Ratio: 298.257 -Depth Datum Name: The aerial photography from which the DOQQs were developed was not tide-coordinated.

Therefore, shorelines in this data set does not represent a consistent vertical datum. Shoreline Attributes: -beach -vegetated -structure -water edge All four categories are linear features, except "beach" which, if sufficiently wide, can be both linear and polygonal. Shorelines were merged into 7.5-minute quadrangles, provided that the aerial photography on which the DOQQs were based was flown in the same year [Summary provided by the Maryland Geology Survey.]