NASA's LP DAAC has released free Version 3 of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital...
NASA's LP DAAC has released free Version 3 of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM). The ASTER GDEM was created using automated analysis of 2.3 million scenes from the ASTER archive and covers land surfaces between 83°N and 83°S.
The initial version of ASTER GDEM was launched in 2009, followed by Version 2 in 2011. With 30-meter spatial resolution and 1°x1° tiles, the ASTER GDEM Version 3 keeps the GeoTIFF format and the same gridding and tile structure as earlier versions.
shaded relief topography in GDEM Version 3.
The ASTER Water Body Dataset is a new worldwide product in version 3. (ASTWBD). All water bodies are classified as ocean, river, or lake in this raster product, and each GDEM tile has a matching Water bady tile.
Direct downloads of ASTER GDEM and ASTWBD tiles are available through NASA's LP DAAC Data Pool. Additionally, the data may be transformed using the LP DAAC's Application for Extracting and Exploring Analysis Ready Samples (AEEARS).
ASTER was manufactured in Japan for the Ministry of Economy, Trade, and Industry and is one of five instruments aboard NASA's Terra mission (launched in 1999). (METI). Instrument design, calibration, and data validation are all handled by a combined US/Japan Science Team.
Japan's Ministry of Economy, Trade and Industry (METI) produced the ASTER sensor, which was launched aboard NASA's Terra mission in December 1999. It features an along-track stereoscopic capacity, which allows it to gather stereo image data with a base-to-height ratio of 0.6 utilising its near-infrared spectral band and nadir-viewing and backward-viewing optics. The horizontal spatial resolution is 15 metres, and the ground area is 60 kilometres by 60 kilometres.
Version 3 features a lower elevation void area than Version 2 due to the increased ASTER stereo image data and enhanced methodology, as well as a lower water area anomaly data due to the use of new global water body data, which will be discussed later.
Comparison between GDEM Version 2 and 3 (Left: Version 2, Right: Version 3)
The red circle represents the elevation vacant area, whereas the blue circle represents the water area.
By visiting NASA's Earthdata Search or downloading directly from the LP DAAC's Data Pool, you may get ASTER GDEM and ASTWBD tiles from Japan Space Systems and the LP DAAC. The data is accessible through the Application for Extracting and Exploring Analysis Ready Samples (AEEARS), which also provides transformation services.
With this release, a new worldwide offering, the ASTER Water Bodies Database, is now accessible (ASTWBD). All water bodies are classified as ocean, river, or lake in this raster product. A Water Body tile corresponds to each GDEM tile. The only water mask spanning almost the whole surface of the Earth is provided by this data package.
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