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 aim of this study is to analyze the accuracy of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM) over Istanbul metropolitan city. Accuracy assessment was conducted by comparing ASTER GDEM with a reference DEM derived from 1/5.000-scaled topographic maps. The selected area has wide range of elevations since it covers coastal and mou...

The Global Digital Elevation Model produced from stereo images of Advanced Spaceborne Thermal Emission and Reflection Radiometer data (ASTER GDEM) covers land surfaces between latitudes of 83°N and 83°S. The Phased Array type L-band Synthetic Aperture Radar (PALSAR) onboard Advanced Land Observing Satellite (ALOS) collected many SAR images since it was launched on 24 January 2006. The combinati...

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...

This paper aims to compare the performance of typical open global DEM datasets by using indexes elevation error, relative error and hydrologic network. Taking Fenhe River Basin China as study area, this research made quantitative comparison among four including SRTM data with 1” (SRTM1) 3” (SRTM3) resolutions, ASTER Global at 2nd version (GDEM-v2) ALOS World 3D-30 m (AW3D) data. Through process...

Shuttle Radar Topographic Mission (SRTM) and ASTER Global Digital Elevation Model (GDEM) provide topographic data in a global scale which are freely available for users. The potential use of these datasets for many forestry applications is highly depending on the accuracy of the datasets. In this study, we evaluated the accuracy of SRTM and ASTER GDEM version 2 with high accuracy topographic da...