Description: Piers were derived from the County's 2011 Impervious Surface dataset which was created by Sanborn Mapping Company in 2012 for the County's storm water fee. This map layer was manually digitized using heads-up processes. Planimetric data acquired by the county via the 2007 aerial imagery was used as a basis for this update. Pier features not captured in the 2007 planimetrics were added, as well as any major changes. Features that no longer exist on the ground were deleted. This task was derived from the 2011 Maryland Statewide Aerial Photography Project imagery, which has a 6-inch pixel resolution. The imagery acquisition was conducted between March 7, 2011 – April 15, 2011(Leaf off conditions) and the imagery Meets ASPRS Class 1 standards at map scale 1:1200 (1” = 100’). The Minimum Mapping Unit for this layer is 100 square feet.
Description: Shorelines are represented as polygons. Using the shoreline polylines, polygons are created to show the waters in the Chesapeake Bay, other bay tributaries, and the land mass. The outer boundary (non-shoreline polylines) is clipped to the County boundary.