What Is An ASTER DEM?
What is an ASTER DEM? The Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (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).
Which DEM is better SRTM or ASTER?
SRTM is considered more accurate as radar beam penetrates into the tree canopy to get accurate topographic measurement, while ASTER gets reflection of sun radiations from tree canopy, which later, photogrammetrically processed to derive DEM.
What is the resolution of ASTER DEM?
ASTER has two telescopes, one for nadir-viewing and another for backward-viewing, with a base-to-height ratio of 0.6. 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.
Where can I download ASTER DEM?
ASTER GDEM and ASTWBD tiles may be downloaded directly from NASA's LP DAAC Data Pool.
What is an Aster image?
ASTER provides high-resolution images of the planet Earth in 14 different bands of the electromagnetic spectrum, ranging from visible to thermal infrared light. The resolution of images ranges between 15 and 90 meters.
Related faq for What Is An ASTER DEM?
Where can I download Aster images?
On www.earthexplorer.usgs.gov you can find aster images.
What is the most accurate DEM data?
The most recently published figure of absolute vertical accuracy of the 3D Elevation Program (3DEP) DEMs within the conterminous United States, in terms of the National Standard for Spatial Data Accuracy (NSSDA) at 95% confidence level, is 3.04 meters.
Which is the best DEM data?
The choice of the DEM for elevation mapping is related with the characteristics of the area you have to study. If your study area is non vegetated, the ASTER-DEM is better, because of its original spatial resolution. In fact, ASTER produce a DSM which is affected by vegetation.
How accurate is SRTM data?
The Shuttle Radar Topography Mission (SRTM) Digital Terrain Elevation Data (DTED) are used with the consensus view that it has a minimum vertical accuracy of 16 m absolute error at 90% confidence (Root Mean Square Error (RMSE) of 9.73 m) world-wide.
How do I download Aster DEM data from USGS?
You can download the ASTER DEM data for free from the USGS Earth Explorer. Under the data sets tab, select Digital Elevation > ASTER .
What is DEM resolution?
DEM data are used in flood models to represent a physical land-surface. The spatial resolution of a DEM refers to the area of land being represented by a single grid cell. So, a spatial resolution of 10 metres means one grid cell is representing a 10 x 10 metre area of physical land.
How do you cite Aster DEM?
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. 003.
How do I download Aster GDEM?
How do I create a DEM file?
What is the full form of Aster?
The ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) sensor is an imaging instrument flown on the Terra satellite which was launched in December 1999.
What is ASTER imagery used for?
Scientists use ASTER data to create detailed maps of land surface temperature, emissivity, reflectance, and elevation.
Are ASTER images free?
Credits: NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team. Beginning 1st April 2016, all Earth imagery from the Japanese remote sensing instrument operating aboard NASA's Terra spacecraft since late 1999 is available to users everywhere at no cost.
What is the ASTER sensor used for?
ASTER is a 15-meter, 14 band multispectral resolution instrument. It can be used for land cover and change detection, calibration, validation, and land surface studies.
Where can I get Aster Data?
ASTER data are are available from several archives:
How do I open Aster Data?
What is Aster Database?
Aster Database is an analytic platform that delivers breakthrough performance that scales to terabytes and even petabytes of data. "Always-Parallel": Aster Database's massively parallel processing (MPP) architecture and embedded MapReduce engine enable end-to-end parallelism of data and analytic processing.
How do I download DEM data from Bhuvan?
How accurate is Google Earth elevation?
The GDEM data are the most widely covered elevation data source (from 83°N to 83°S, covering about 99% the globe) with a grid resolution of 30 meters. A vertical accuracy study found the root mean square error (RMSE) of GDEM data is 8.68 meters when compared against 18,000 geodetic control points in the USA .
Is Dem raster or vector?
A DEM can be represented as a raster (a grid of squares, also known as a heightmap when representing elevation) or as a vector-based triangular irregular network (TIN). The TIN DEM dataset is also referred to as a primary (measured) DEM, whereas the Raster DEM is referred to as a secondary (computed) DEM.
What are two common sources of global DEM data?
Major DEM Sources
|Source Type||Geographical Region|
|National Elevation Dataset (NED)||U.S., Puerto Rico, Territorial Islands of the U.S., and Mexico|
|Shuttle Radar Topography Mission (SRTM)||Global Global U.S.|
|ASTER Global Elevation Data||Global|
|Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010)||Global|
What is a 1/3 arc second DEM?
The 1/3 arc-second (~10 meter) DEM is the highest resolution seamless DEM dataset for the U.S. with full coverage of the 48 conterminous states, Hawaii, and U.S. territories. Alaska coverage is partially available and is being expanded to statewide coverage as part of the Alaska Mapping Initiative.
What is DEM file format?
DEMs are files that contain either points (vector) or pixels (raster), with each point or pixel having an elevation value. They come in a variety of file formats, from . dem to . txt, and you can derive lots of other information - like contours or 3D surface models - from them.
Is SRTM bare earth?
We develop the first global 'Bare-Earth' Digital Elevation Model (DEM) based on the Shuttle Radar Topography Mission (SRTM) for all landmasses between 60N and 54S.