Abstract
Abstract. The aim of this study is to investigate the effect of various Global Digital Elevation Models (GDEMs) in producing high-resolution topography model using TanDEM-X (TDX) Coregistered Single Look Slant Range Complex (CoSSC) images. We selected an image acquired on Jun 12th, 2012 over Doroud region in Lorestan, west of Iran and used 4 external digital elevation models in our processing including DLR/ASI X-SAR DEM (SRTM-X, 30m resolution), ASTER GDEM Version 2 (ASTER-GDEMV2, 30m resolution), NASA SRTM Version 4 (SRTM-V4, 90m resolution), and a local photogrammetry-based DEM prepared by National Cartographic Center (NCC DEM, 10m resolution) of Iran. InSAR procedure for DEM generation was repeated four times with each of the four external height references. The quality of each external DEM was initially assessed using ICESat filtered points. Then, the quality of, each TDX-based DEM was assessed using the more precise external DEM selected in the previous step. Results showed that both local (NCC) DEM and SRTM X-band performed the best (RMSE< 9m) for TDX-DEM generation. In contrast, ASTER GDEM v2 and SRTM C-band v4 showed poorer quality.
Highlights
The increasing demand for a precise Digital Elevation Model (DEM) in various applications such as agricultural, navigation, flood management, and defense needs a careful attention in DEM production procedures
The main objective of this paper is to assess the quality of TanDEM-X InSAR DEM when different height references are used to for long-wavelength topographic phase removal. 4 external digital elevation models were used in our processing including DLR/ASI X-SAR DEM (SRTM-X, 30m resolution)
The aim of this paper was to assess the quality of TanDEM-X DEM when different external height references were used in the long-wavelength topographic phase removal step of DEM generation
Summary
The increasing demand for a precise Digital Elevation Model (DEM) in various applications such as agricultural, navigation, flood management, and defense needs a careful attention in DEM production procedures. One of the best ways to produce DEM is to use high-resolution radar images by implementing InSAR techniques. One of the most important steps in producing DEM using radar data is the height reference model that is used in interferometric processing to remove long-wavelength topographic phase component from differential interferograms before phase unwrapping. This step helps improve phase unwrapping quality especially in regions with steep slopes and improve the absolute precision of the final DEM (Chunxia and Linlin, 2005). The effect of various global digital elevation models in producing high-resolution DEMs using TanDEM-X
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