2025年1月30日 · A digital elevation model (DEM) is a 3D graphic of the "bare earth" surface of land shown without trees, buildings or other objects. DEMs can be created using traditional topographic maps, modern light detection and ranging (lidar) data and other sources gathered by airborne and space-based instruments.

2020年11月4日 · Version 3 of the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model is now available from NASA’s Land Processes Distributed Active Archive Center . The ASTER GDEM covers land surfaces between 83°N and 83°S, and was produced through automated processing of 2.3 million scenes from the ASTER …

2021年12月7日 · The digital elevation models, or DEMs, are the first data released as part of the EarthDEM Project, a collaboration between PGC, the Byrd Polar Research Center at The Ohio State University, the National Center for Supercomputing Applications at the University of Illinois, and government partners to produce high-resolution terrain maps for ...

Each SRTM radar assembly contained two types of antenna panels: C-band and X-band. C-band radar data were used to create near-global topographic maps of Earth called Digital Elevation Models (DEMs). Data from the X-band radar were used to create slightly higher resolution DEMs but without the global coverage of the C-band radar.

Our objective is to provide the scientific and civil communities with a state-of-the-art global digital elevation model (DEM) derived from a combination of Shuttle Radar Topography Mission processing improvements, elevation control, void-filling and merging with data unavailable at the time of the original SRTM production:

2021年3月1日 · SRTM obtained elevation data on a near-global scale using radar interferometry. Version 3.0 SRTM Global 1 arc second product is void-filled using elevation data from Advanced Spaceborne Thermal Emission and Reflection Radiometer ( ASTER ) Global Digital Elevation Model 2 ( GDEM2 ), USGS Global Multi-resolution Terrain Elevation Data ( GMTED ...

This recipe allows the user to create a Digital Elevation Model (DEM) product from two Sentinel-1 SLC scenes. The user first creates an interferogram, and completes the appropriate phase unwrapping steps, then creates the DEM. Pair Selection for DEMs. ASF’s baseline tool may be used to select a pair of Sentinel images to create the DEM.

Over the areas lying outside the SRTM latitude limits, other sources have been used including Global Observations to Benefit the Environment (GLOBE) and the original Altimeter Corrected Elevations (ACE) Digital Elevation Model (DEM), together with new matrices derived from reprocessing the European Remote Sensing (ERS-1) Geodetic Mission data ...

ASTER provides a Global Digital Elevation Model (GDEM) of Earth's land surface at approximately 30-meter spatial resolution. ASTER GDEM is available for download on Earthdata Search . Learn more about ASTER

1997年3月9日 · A digital model or 3D representation of a terrain's surface created from terrain elevation data. Definition source: Wiki.GIS