METWP24 depicts political boundaries, common town names, and geocodes for Maine at 1:24,000 scale. The coverage was created from USGS, 7.5 minute map series, town boundaries. The Maine GIS base layer COAST, which contains Maine's coastal Mean High Water (MHW) mark and Maine islands, was used in the development of METWP24. To correct mapping errors and reflect recent changes to Minor Civil Division (MCD) boundaries, arcs and polygons have been added to or updated in METWP24 from: photorevised USGS data; Maine GIS base layer coincident features; legal descriptions; GPS data; and Maine Department of Transportation (MEDOT) engineering plans. METWP24 contains USGS 1:100,000 scale data and U.S. Department of Commerce, Bureau of Census, TIGER Line Files 1990 and 2000 where these provide a more correct or best available representation of a dataset feature.
EastCoast_a is a coastline extracted from the NOAA National Geophysical Data Center’s Global Self-consistent, Hierarchical, High-resolution Geography Database (GSHHG). GSHHG is a high-resolution geography data set, amalgamated from two databases in the public domain: World Vector Shorelines (WVS) and CIA World Data Bank II (WDBII). The former is the basis for shorelines while the latter is the basis for lakes, although there are instances where differences in coastline representations necessitated adding WDBII islands to GSHHG. GSHHG data have undergone extensive processing and should be free of internal inconsistencies such as erratic points and crossing segments. The shorelines are constructed entirely from hierarchically arranged closed polygons.