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These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer called the Sea Level Rise and Coastal Flooding Impacts Viewer. It depicts potential sea level rise and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at sea level rise (slr) and coastal flooding impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses. Data and maps provided can be used at several scales to help gauge trends and prioritize actions for different scenarios. The Sea Level Rise and Coastal Flooding Impacts Viewer may be accessed at: http://www.coast.noaa.gov/slr This digital elevation model (DEM) is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Sea Level Rise and Coastal Flooding Impacts Viewer described above. The DEM created for this project was developed using the NOAA National Weather Service's Weather Forecast Office (WFO) boundaries. This DEM includes the best available lidar data known to exist at the time of DEM creation that met project specifications, for Maryland, west of the Chesapeake Bay. This DEM falls in the Baltimore/Washington (LWX) WFO. The DEM covers the following Maryland counties: Baltimore City (portion), Howard (portion), Anne Arundel, Charles, and St. Mary's. This DEM does not include the counties that are also in the LWX WFO of Baltimore, Calvert, and Harford. This is because the lidar data for these counties are licensed and unavailable for distribution to the general public. As such, the extent of this DEM is different than that of the DEM used by the NOAA Office for Coastal Management in creating the inundation data seen in the Sea Level Rise and Coastal Impacts Viewer (www.coast.noaa.gov/slr/viewer). This DEM is derived from multiple lidar datasets furnished by NOAA, the United States Army Corps of Engineers (USACE), and the United States Geological Survey (USGS). A list of lidar data sources can be found in the Process Lineage. Hydrographic breaklines were delineated using lidar intensity imagery generated from the lidar. The DEM is hydro flattened such that water elevations are less than or equal to 0 meters. The DEM is referenced vertically to the North American Vertical Datum of 1988 (NAVD88) with vertical units of meters and horizontally to the North American Datum of 1983 (NAD83). The resolution of the DEM is approximately 10 meters.