Accurate digital terrain models (DTMs) are necessary for a wide variety applications. National-scale mediumresolution elevation data have been acquired for the conterminous United States under the USGS National Elevation Data (NED; 10 m and 30 m), the Shuttle Radar Topographic Mapping (SRTM; 30 m), and the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER; 30 m) programs. In...

The 1:50.000 topographic maps present a nominal horizontal accuracy of 20 meters and a nominal vertical accuracy of 10 meters with 90% confidence. The data were in most cases extracted with photogrammetric techniques from aerial stereo-photographs during the 80’s. The usual update rate for these maps ranges from ten to twenty years. The Advanced Spaceborn Thermal Emission and Reflection Radiome...

Regional scale geological maps are still not available for many remote parts of the Earth. All geological maps contain two fundamental pieces of information: a) lithological data: a list of the various rock types present, and b) structural data: geometrical information that describes the spatial relationships of the various rock units. For the purposes of regional scale geological mapping the s...

Nowadays, like many other fields, DEM is widely used in the field of hydraulic engineering. In our studies, we compared DEMs (SRTM, ASTER GDEM v2, and ALOS PALSAR) for area recommended construction Shurbulak water reservoir. Contours were developed all with contours a topographic map. The SRTM PALSAR closely match on map than ASTER. Vertical differences between SRTM, GDEM2, products computed ro...

The recent release of worldwide SRTM 1 DEM and AW3D30 adds new members to the open global medium resolution (90–30 m ground spacing) digital elevation models. Together with the previously existing SRTM 3 and ASTER GDEM, their quality is of great interest to various scientific applications. This paper uses 1:50,000 DEM in Hubei Province of China as a reference to assess their vertical accuracy i...

* Corresponding author. E-mail address: [email protected] (B. 1537-5110/$ – see front matter a 2008 IAgrE doi:10.1016/j.biosystemseng.2008.09.010 Digital Elevation Model (DEM) fusion was investigated for improving the overall accuracy of DEMs. The approach was applied to two public domain products: Shuttle Radar Topographic Mission (SRTM) DEM and Advanced Spaceborne Thermal Emission and Refl...

The last 20 years show an enormous resolution improvement of worldwide available Digital Elevation Models. At present, the ASTER Global Digital Elevation Model (GDEM) with a resolution of 30 m shows an evolution from the GTOPO 30 model (1000 m) of the year 1996 and the SRTM model (90 m) of the year 2000. However, little is known about the accuracy of the ASTER GDEM itself and for the official t...

The DEM is often required for flooding or drainage modeling, land use studies, and geological other applications. A variety of DEMs, such as the Advanced Space Thermal Emission Radiometer (ASTER GDEM) Radar Topography Mission (SRTM) are currently available to public free charge. However, these DEMs remain a representation reality, which requires, before any application, their evaluation using h...

Compared with the traditional lumped hydrological models, distributed hydrological model, considering the effects of the uneven spatial distribution of watershed land surface on the hydrological cycle, has the characteristic of physical mechanism. Seeing from overall structure, there are two types of distributed hydrological model, which are runoff and convergence. The establishment of converge...