How To Download Free DEM Digital Elevation Model ASTER GDEM Global DEM Version 3 The ASTER instrument was built by Japan’s Minist...
How To Download Free DEM Digital Elevation Model ASTER GDEM Global DEM Version 3
The ASTER instrument was built by Japan’s Ministry of Economy, Trade and Industry (METI) and launched aboard NASA’s Terra spacecraft in December 1999. It has an along-track stereoscopic capability using its near infrared spectral band and its nadir-viewing and backward-viewing telescopes to acquire stereo image data with a base-to-height ratio of 0.6. The spatial resolution is 15 meters in the horizontal plane, with a 60 kilometer by 60 kilometer ground area.
The methodology used to produce the ASTER GDEM involved automated processing of 2.3 million scenes from the ASTER archive, including stereo-correlation to produce individual scene-based ASTER DEMs, masking to remove cloudy pixels, stacking all cloud-screened DEMs, removing residual bad values and outliers, averaging selected data to create final pixel values, and then correcting residual anomalies before partitioning the data into 1° by 1° tiles.
Aster GDEM V3 Data search
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