The Portland DEM integrates bathymetry and topography in the area surrounding the town of Portland, Maine. It covers the coastal region from Portsmouth in the southwest to Boothbay Harbor to the north east and includes the communities Ogunquit, Wells, Old Orchard Beach, Yarmouth, Freeport, Phippsburg, and Bath. The DEM has a 1/3 arc-second (~10 meter) cell size, and is referenced to a vertical datum of mean high water. It was built in December 2008 to support NOAA's Tsunami Program.
|Horizontal Datum||WGS 84|
|Vertical Datum||MHW (meters)|
|Vertical Transformation||Source elevation data transformed vertically using constant offset.|
|Cell Size||1/3 arc-second|
|Source||NOAA / NGDC / MGG|
|Developer||NOAA / NGDC / MGG|
|Project||NOAA Tsunami Inundation|
|Contact||Barry W Eakins @ NOAA / NGDC|
WARNING: DEM not to be used for navigation.