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07 June 2021 | dataset

ASTER Global Digital Elevation Model (GDEM) Version 3 (ASTGTM) - Tonga

The ASTER Global Digital Elevation Model (GDEM) Version 3 (ASTGTM) provides a global digital elevation model (DEM) of land areas on Earth at a spatial resolution of 1 arc second (approximately 30 meter horizontal posting at the equator).

The development of the ASTER GDEM data products is a collaborative effort between National Aeronautics and Space Administration (NASA) and Japan’s Ministry of Economy, Trade, and Industry (METI). The ASTER GDEM data products are created by the Sensor Information Laboratory Corporation (SILC) in Tokyo.

The ASTER GDEM Version 3 data product was created from the automated processing of the entire ASTER Level 1A archive of scenes acquired between March 1, 2000, and November 30, 2013. Stereo correlation was used to produce over one million individual scene based ASTER DEMs, to which cloud masking was applied. All cloud screened DEMs and non-cloud screened DEMs were stacked. Residual bad values and outliers were removed. In areas with limited data stacking, several existing reference DEMs were used to supplement ASTER data to correct for residual anomalies. Selected data were averaged to create final pixel values before partitioning the data into 1° by 1° tiles with a one pixel overlap. To correct elevation values of water body surfaces, the ASTER Global Water Bodies Database (ASTWBD) Version 1 data product was also generated.

The geographic coverage of the ASTER GDEM extends from 83° North to 83° South. Each tile is distributed in GeoTIFF format and projected on the 1984 World Geodetic System (WGS84)/1996 Earth Gravitational Model (EGM96) geoid. Each of the 22,912 tiles in the collection contain at least 0.01% land area.

Data and Resource

zip
1 arc-second Digital Elevation Model and Hillshade

Resource contains raster files for a Digital…

Field Value
Publisher Secretariat of the Pacific Regional Environment Programme
Modified 07 June 2021
Release Date 07 June 2021
Homepage URL https://lpdaac.usgs.gov/products/astgtmv003/
Identifier 6b6bd31a-d664-4926-b77b-3f39dd009bb8
Spatial / Geographical Coverage Location Tonga
Language English (United States)
License Public
[Open Data]
Author Sensor Information Laboratory Corporation
Contact Name Sensor Information Laboratory Corporation