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Department of Emergency Management | SF. gov The San Francisco Department of Emergency Management (DEM) leads the City in planning, preparedness, communication, response, and recovery for daily emergencies, large scale citywide events, and major disasters
Digital Elevation Terrain Model (DEM) | NASA Earthdata NASA's data for digital elevation models (DEM) comes from airborne and space-based sources and are useful for analyzing a majority of Earth's terrain A digital elevation model (DEM) is a three-dimensional graphic of the "bare earth" surface of land shown without trees, buildings or other objects
What is a digital elevation model (DEM)? - USGS. gov A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects DEMs are created from a variety of sources USGS DEMs used to be derived primarily from topographic maps
Digital elevation model - Wikipedia A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid A "global DEM" refers to a discrete global grid
3DEP Viewer - The National Map Hillshaded surface generated dynamically from the elevation layer, with a solar azimuth of 315 degrees and solar altitude of 45 degrees Multi-directional hillshaded surface generated dynamically from the elevation layer, with hillshade computed from 6 different directions
90 m DEM of California, USA - Data Basin SRTM data are organized into individual rasterized cells, or tiles, each covering one degree by one degree in latitude and longitude Sample spacing for individual data points is either 1 arcsecond, 3 arc-seconds, or 30 arc-seconds, referred to as SRTM1, SRTM3 and SRTM30, respectively
DEM, DSM DTM: Elevation Models in GIS - GIS Geography What is a Digital Elevation Model (DEM)? A digital elevation model is a bare-earth raster grid referenced to a vertical datum When you filter out non-ground points such as bridges and roads, you get a smooth digital elevation model