• Thumbnail for Digital elevation model
    A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying...
    31 KB (3,352 words) - 04:25, 21 February 2025
  • Thumbnail for Advanced Spaceborne Thermal Emission and Reflection Radiometer
    after 1 April 2008 has been marked as unusable. The ASTER Global Digital Elevation Model (GDEM) is available at no charge to users worldwide via electronic...
    13 KB (1,082 words) - 21:33, 9 February 2025
  • Thumbnail for Elevation
    The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the...
    6 KB (561 words) - 17:58, 4 May 2025
  • The Reference Elevation Model of Antarctica (REMA) is a digital elevation model (DEM) that covers almost the entire continent of Antarctica at a resolution...
    4 KB (516 words) - 05:26, 31 March 2025
  • Digital Terrain Elevation Data) is a standard of digital datasets which consists of a matrix of terrain elevation values, i.e., a Digital Elevation Model...
    3 KB (280 words) - 00:48, 2 October 2024
  • Thumbnail for Topography
    Satellite RADAR mapping is one of the major techniques of generating Digital Elevation Models (see below). Similar techniques are applied in bathymetric surveys...
    17 KB (1,988 words) - 19:00, 7 May 2025
  • Thumbnail for Lidar
    bathymetric models in shallow water. The main constituents of airborne lidar include digital elevation models (DEM) and digital surface models (DSM). The...
    128 KB (14,548 words) - 02:56, 24 April 2025
  • USGS DEM (category Digital elevation models)
    the United States Geological Survey for storing a raster-based digital elevation model. It is an open standard, and is used throughout the world. It has...
    7 KB (577 words) - 05:26, 10 December 2023
  • Thumbnail for Triangulated irregular network
    often called a digital elevation model (DEM), which can be further used to produce digital surface models (DSM) or digital terrain models (DTM). An advantage...
    5 KB (620 words) - 22:45, 20 March 2024
  • Thumbnail for Geographic information system
    The digital elevation model, consisting of surface elevations recorded on a 30-meter horizontal grid, shows high elevations as white and low elevation as...
    101 KB (13,199 words) - 22:48, 8 April 2025
  • Thumbnail for Watershed delineation
    widespread use. Computerized methods for watershed delineation use digital elevation models (DEMs), datasets that represent the height of the Earth's land...
    30 KB (3,165 words) - 18:17, 19 April 2025
  • Thumbnail for Global relief model
    relief model, sometimes also denoted as global topography model or composite model, combines digital elevation model (DEM) data over land with digital bathymetry...
    8 KB (1,001 words) - 03:31, 26 April 2025
  • Thumbnail for Orthophoto
    the area between so scale may not be uniform across the image. A digital elevation model (DEM) is required to create an accurate orthophoto as distortions...
    6 KB (607 words) - 22:04, 3 May 2025
  • Thumbnail for Heightmap
    mainly as Discrete Global Grid in secondary elevation modeling. Each pixel stores values, such as surface elevation data, for display in 3D computer graphics...
    6 KB (624 words) - 12:16, 4 April 2024
  • Thumbnail for Shuttle Radar Topography Mission
    Shuttle Radar Topography Mission (category Digital elevation models)
    that obtained digital elevation models on a near-global scale from 56°S to 60°N,: 4820  to generate the most complete high-resolution digital topographic...
    21 KB (2,113 words) - 11:06, 26 April 2025
  • Thumbnail for Polar Geospatial Center
    Landforms by Object-Based Image Analysis and Spectral Parameters of Digital Elevation Model". IEEE Transactions on Geoscience and Remote Sensing: 1–17. doi:10...
    4 KB (405 words) - 20:10, 13 July 2023
  • Raster Product Format) USGS DEM – The USGS' Digital Elevation Model GTOPO30 – Large complete Earth elevation model at 30 arc seconds, delivered in the USGS...
    23 KB (2,996 words) - 09:53, 2 April 2025
  • Thumbnail for Raised-relief map
    a raised-relief map using a 3D printer, Digital Elevation Models (DEM) are rendered into a 3D computer model, which can then be sent to a 3D printer....
    13 KB (1,663 words) - 21:06, 4 April 2025
  • particularly important in geostatistics, where it is used to create a digital elevation model from a set of points on the Earth's surface (for example, spot...
    6 KB (758 words) - 20:41, 17 February 2025
  • Thumbnail for Terrain
    specific landforms. A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent...
    14 KB (1,586 words) - 03:40, 26 April 2025
  • 3D terrain model is adopted as the carrier for the demands in many correlative fields. Based on the regular grid DEM (Digital Elevation Model) in DRGS,...
    2 KB (276 words) - 08:09, 27 April 2025
  • Thumbnail for Ablation
    Andreas (2004). "Combining satellite multispectral image data and a digital elevation model for mapping debris-covered glaciers". Remote Sensing of Environment...
    23 KB (2,946 words) - 02:11, 30 November 2024
  • 800 km north of Giza. In 2003, a new calculation based on a global digital elevation model obtained from satellite measurements, ETOPO2,  whose data points...
    8 KB (873 words) - 04:11, 2 May 2025
  • GTOPO30 (category Digital elevation models)
    GTOPO30 is a digital elevation model for the world, developed by United States Geological Survey (USGS). It has a 30-arc second resolution (approximately...
    6 KB (128 words) - 21:28, 14 September 2023
  • spatial data. It is particularly suited to handling Digital Elevation Models (DEMs) and other surface models. It is written in Java and runs on Windows, Mac...
    2 KB (202 words) - 15:47, 9 January 2024
  • Thumbnail for Yonaguni Monument
    conducted a topographical analysis of Yonaguni Island using a digital elevation model and geological field investigations of the strata, rocks, and microtopography...
    12 KB (1,269 words) - 21:59, 11 January 2025
  • software package allows the creation of orthophoto mosaics and digital elevation model (DEM). Some services the company offers include: Orthophotos are...
    15 KB (1,739 words) - 16:06, 8 January 2024
  • Ramer–Douglas–Peucker algorithm (category Digital signal processing)
    through the application of an iterative method. The running time for digital elevation model generalization using the three-dimensional variant of the algorithm...
    12 KB (1,189 words) - 03:53, 14 March 2025
  • Thumbnail for Landform
    valleys, etc.) are called oronyms. Landforms may be extracted from a digital elevation model (DEM) using some automated techniques where the data has been gathered...
    9 KB (1,046 words) - 21:40, 12 May 2025
  • Thumbnail for Rasterisation
    vector source for topography data, often rasterized as a (raster) digital elevation model. Display list Spatial anti-aliasing Michael F. Worboys (30 October...
    8 KB (838 words) - 16:10, 28 April 2025