Is ASTER GDEM accurate?

The absolute vertical accuracy of GDEM v3 was calculated by comparison with more than 23,000 independent reference geodetic ground control points from the U.S. National Geodetic Survey. The root mean square error (RMSE) measured for GDEM v3 is 8.52 meters. This compares with the RMSE of 8.68 meters for GDEM v2.

Which Dem is better SRTM or ASTER?

SRTM is better than ASTER, it is available freely with 30 m spatial resolution at Earthexplorer for wholw globe.

What is the resolution of ASTER DEM?

The spatial resolution is 15 meters (m) in the horizontal plane. Each scene consists of 4,100 samples by 4,200 lines which corresponds to about 60 kilometers (km) by 60 km ground area.

What does ASTER GDEM stand for?

ASTER Global Digital Elevation Map Announcement The first version of the ASTER GDEM, released in June 2009, was generated using stereo-pair images collected by the ASTER instrument onboard Terra.

How do you find vertical accuracy?

Compute Accuracy(z) = 1.9600 * RMSE(z) = Vertical Accuracy at 95 percent confidence level. confidence level in open terrain using RMSE(z) x 1.9600. “

What is the best Dem?

In late 2014, the United States government released the highest resolution SRTM DEM to the public. This 1-arc second global digital elevation model has a spatial resolution of about 30 meters. Also, it covers most of the world with an absolute vertical height accuracy of less than 16m.

Where can I download SRTM data?

The Version 2 directory also contains the vector coastline mask derived by NGA during the editing, called the SRTM Water Body Data (SWBD), in ESRI Shapefile format. The data may be obtained through this URL: http://dds.cr.usgs.gov/srtm/ Go to the directory where both version 1 and version 2 directories may be found.

How do you cite ASTER GDEM data?

Citing ASTER GDEM V3 data: NASA/METI/AIST/Japan Space Systems, and U.S./Japan ASTER Science Team. ASTER global digital elevation model V003, 2018, distributed by NASA EOSDIS Land Processes DAAC, https://doi.org/ 10.5067/ASTER/ASTGTM.

What is NASA’s SRTM?

The Shuttle Radar Topography Mission (SRTM) is an international research effort that obtained digital elevation models on a near-global scale from 56°S to 60°N, to generate the most complete high-resolution digital topographic database of Earth prior to the release of the ASTER GDEM in 2009.

What is ASTER measurement?

ASTER stands for the Advanced Spaceborne Thermal Emission and Reflection radiometer. The EOS-Terra orbit is a circular, near polar orbit at 705 km altitude.

Is ASTER a satellite or sensor?

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is one of five state-of-the-art instrument sensor systems operating on the Terra spacecraft. The Terra satellite was launched on December 18, 1999.