What is the difference between SRTM and DEM?
What is the difference between SRTM and DEM?
On technical side, SRTM 30 meter DEM is supposed to be more accurate than ASTER 30 DEM. The reason behind is the technique adopted for DEM derivation. SRTM uses radar observations to construct DEM while ASTER uses stereo imagery and photogrammetric techniques to extract DEM.
What is DEM accuracy?
Digital Elevation Model (DEM) is a quantitative representation of terrain and is important for Earth science and hydrological applications. The overall vertical accuracy shows RMS error of 12.62 m and 17.76 m for ASTER and SRTM DEM respectively, when compared with Cartosat DEM.
What is SRTM DEM data?
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 does 30m DEM mean?
One dataset that we often turn to is the Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM). Some background on the mission: SRTM was collected at a resolution of 30 meters, meaning every pixel in the dataset represents a 30m by 30m area.
How do I know if my DEM is accurate?
The simplest, most easily interpreted way is just to compute the root mean squared error (RMSE) between the DEM elevations and the “correct” elevations at your reference points — this will give you a very easily understood “average error.” In addition, many authors use this RMSE data to produce an error map showing …
What is DEM PDF?
Digital Elevation Model (DEM) is the digital representation of the land surface elevation with respect to any reference datum. DEM is the simplest form of digital representation of topography . DEMs are used to determine terrain attributes such as elevation at any point, slope and aspect.
Is SRTM a DTED?
SRTM is a Digital Elevation Model (DSM), whereas Digital Terrain Elevation Data (DTED) is a Digital Surface Model (DSM).
How accurate are SRTM elevations data?
For our study area, the 30 m SRTM elevations data featured a much greater absolute vertical accuracy than the absolute vertical accuracy value of ±16 m, which published in the SRTM data specification. 1. Introduction A Digital Elevation Model (DEM) is a 3D representation of the bare ground surface without any objects, like plants and buildings.
What does SRTM stand for?
Abstract Shuttle radar topographic mission (SRTM) has created an unparalleled data set of global elevations that is freely available for modeling and environmental applications. The global availability (almost 80% of the Earth surface) of SRTM data provides baseline information for many types of the worldwide research.
Where can I find the data for my SRTM file?
The data may be obtained through this URL: http://dds.cr.usgs.gov/srtm/ and go to the directory where both version 1 and version 2 directories may be found. Please read the appropriate documentation, also found in the directories.
Is the aw3d30 more accurate than srtm-30m and Aster gdem2?
The results of the vertical accuracy assessment suggest that the AW3D30 is more accurate than SRTM-30m and ASTER GDEM2, at least for the areas considered in this study.
