2025年1月23日 · 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 3D graphic of the "bare earth" surface of land shown without trees, buildings or …

We propose a significant modernization of the publicly- and freely-available DEM data. Accurate surface elevation information is a critical component in scientific research and commercial and military applications. The current SRTM DEM product is the most intensely downloaded dataset in …

2019年9月14日 · However, there is continued interest and demand for the GeoTIFF file format, mostly as a distribution format for satellite or aerial photography imagery and for other kinds of data such as Digital Elevation Model (DEM) data and Digital Ortho Quadrangle data. Status. OGC GeoTIFF 1.1 is an approved NASA Earth Science Data Systems standard.

2021年12月7日 · High-resolution Digital Elevation Models (DEM) for non-polar regions at two-meter spatial resolution are now available through NASA’s Commercial SmallSat Data Acquisition (CSDA) program.

2020年11月4日 · The first ASTER GDEM was released in 2009, with Version 2 being released in 2011. The ASTER GDEM Version 3 maintains the GeoTIFF format and the same gridding and tile structure as in previous versions, with 30-meter spatial resolution and 1°x1° tiles.

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.

2024年12月3日 · This recipe from NASA's Alaska Satellite Facility guides you through creating a Digital Elevation Model (DEM) from two Sentinel-1 SLC scenes. Follow the steps: create an interferogram, perform phase unwrapping, and generate the DEM.

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) obtains high-resolution images of Earth in 14 different wavelengths of the electromagnetic spectrum, ranging from visible to thermal infrared light. Scientists use ASTER data to create detailed maps of land surface temperatur

Explore Learning Resources. NASA’s massive archive of Earth science data are free and open to any user for any purpose—but accessing, analyzing, visualizing, and applying these data requires a certain degree of knowledge about Earth observation data and how it is collected and optimized.

2021年3月1日 · This is the third release in the series providing access to additional NASA SRTM Version 3.0 Global 1 arc second (SRTMGL1) data coinciding with areas released by the USGS. The data are available for download via Earthdata Search and the LP DAAC Data Pool. For further information, contact LP DAAC User Services.