USGS Decision Support for Coastal Science and Management - LiDAR data of coastal and marine environments acquired by the USGS Coastal and Marine Geology Program. Data includes coverage of many coastal National Parks, Monuments, Recreation Areas, and Historic Sites.
NOAA Digital Coasts: Coastal LiDAR - LiDAR coverage in narrow coastal swaths acquired mostly for topographic change mapping. Point clouds and custom DEMs available.
NOAA National Geophysical Data Center Global Land 1 km Base DEM - “A 30-arc-second (1-km) gridded, quality-controlled global Digital Elevation Model (DEM)”
NOAA National Geophysical Data Center ETOPO1 Global Relief Model - “ETOPO1 is a 1 arc-minute global relief model of Earth’s surface that integrates land topography and ocean bathymetry.”
Marine Geoscience Data System Global Multi-Resolution Topography Data Portal - “The Global Multi-Resolution Topography (GMRT) synthesis is a continuously-updated compilation of seafloor topography derived from multibeam bathymetry data.”
GMTSAR DEM generation service - Web-based service to access SRTM1, SRTM3, and ASTER1 DEMs designed for use with the GMTSAR InSAR processing toolkit.