So, if you’re looking to model with lots of detail, then small grid spacing (or small cell size) is the one to go for.ĭigital terrain models or DTMs have different definitions depending on where you are in the world.ĭTM is known as a synonym of bare-earth DEM. The smaller the grid cells are, the more detailed the information within a DEM data file is. They are raster grids of the Earth’s surface referenced to the vertical datum-the surface of zero elevation to which heights are referred to by scientists, insurers, and geodesists.Īt most scales and environments, a generic term like DEM can be used because the differentiation between the bare-earth and a surface object is not significant, with DEMs commonly having spatial resolutions of 20 m or more. These project web pages were created by and are hosted by the World Data Service for Geophysics, Boulder.A Digital Elevation Model, also known as a DEM, is a type of raster GIS layer.
Digital data base on the World Wide Web (URL: ) and CD-ROMs. National Oceanic and Atmospheric Administration, National Geophysical Data Center, 325 Broadway, Boulder, Colorado 80305-3328, U.S.A. The Global Land One-kilometer Base Elevation (GLOBE) Digital Elevation Model, Version 1.0. Elphingstone, Mark Bootz, Hiroshi Murakami, Hiroshi Maruyama, Hiroshi Masaharu, Peter Holland, John Payne, Nevin A. How to cite the Global Land One-km Base Elevation Project (GLOBE) database: GLOBE Task Team and others (Hastings, David A., Paula K. It was part of Focus I of the International Geosphere-Biosphere Programme - Data and Information System. The Global Land One-km Base Elevation Project (GLOBE) Task Team was established by the Committee on Earth Observation Satellites. A 30-arc-second (1-km) gridded, quality-controlled global Digital Elevation Model (DEM).
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