Topography is a crucial surface characteristic in soil erosion modeling. Soil erosion studies use a digital elevation model (DEM) to derive the topographical characteristics of a study area. Majority of the times, a DEM is incorporated into erosion models as a given parameter and it is not tested as extensively as are the parameters related to soil, land-use and climate. This study compares ero...

An approach to DEM fusion was developed to improve the overall accuracy of DEMs and applied to two public products: Shuttle Radar Topographic Mission (SRTM) DEM and Advanced Spaceborne Thermal Emission and Reflection (ASTER) DEM. The relative ASTER DEM was co-registered to the SRTM coordinates and converted to the near absolute DEM by shifting the histogram to the average elevation of the SRTM ...

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Over the last few years DSMs derived from satellite sensors, as SRTM (Space Shuttle Radar Topography Mission) and ASTER (Advance Space borne Thermal Emission and Reflection Radiometer) DSMs, have been issued and continuously updated. The SRTM DSM is delivered in three different versions (Finished, DTED, CGIAR), with different nominal accuracy covering a large part of the world at a resolution o...

Mathematical models have been widely used to quantify hydrological processes for various practical purposes. These depend on geomorphological attributes which are derived from relief information represented by Digital Elevation Models (DEM). The objective of this study was evaluate the influence sources (ASTER, SRTM-30, SRTM-90, and TOPO) over characterization five Brazilian watersheds. Geoproc...

This study makes contributions toward development of accurate DEM from ground and satellite data over South Africa. is achieved by preparing recent satellite-based DEMs (AW3D30, SRTM, ASTER, TanDEM-X, MERIT), assessing their vertical accuracy, selecting candidate DEMs, modelling errors for the fusing DEMs. Following removal outliers each DEM, a different number levelling are used in assessment ...

This study attempts to investigate the relationship between accuracy of different Digital Elevation Model (DEM) and fractal dimension D solve problem determining optimal catchment area threshold in plain watersheds. In this study, dimensions Shuttle Radar Topographic Survey (SRTM) V4.1 DEM, Hydrology 1K (HYDRO1K) Advanced Spaceborne Thermal Emission Reflection Radiometer Global (ASTER GDEM) wit...

Supplementary data Data processing 1. Topographic data Because the SRTM data are not continuous, we filled minor holes of a few pixels by interpolation and filled larger holes with 90-m elevation-adjusted Digital Terrain Elevation Data (DTED). For the remaining regions with missing topographic information, we used digital elevation models (DEMs) created from stereo-views of the Advanced Spacebo...

Nowadays the free-access digital elevation models are getting more and more popular. The SRTM and ASTER GDEM databases are the most widespread. However, there are numerous situations and weaknesses we have to take into account during their usage, such as the direction-dependent accuracy and the difference between the digital and the real surfaces. Our goal was to examine these kinds of deficien...