"GeoMapApp is an earth science exploration and visualization application that is continually being
expanded as part of the Marine Geoscience Data System (MGDS) at the Lamont-Doherty Earth Observatory of Columbia University.
The application provides direct access to the Global Multi-Resolution Topography (GMRT)
compilation that hosts high resolution (~100 m node spacing)
bathymetry from multibeam data for ocean areas and ASTER (Advanced
Spaceborne
Thermal Emission and Reflection Radiometer) and NED (National
Elevation Dataset) topography datasets for the global land masses.
GeoMapApp provides instant access to a large variety of data from
multiple sources. The following pages provide information on all data
available through GeoMapApp hosted by the Marine Geoscience Data System and over 100 other data repositories."
http://www.geomapapp.org/
https://www.youtube.com/user/GeoMapApp
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