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In this paper, the accuracy of TanDEM-X DEMs is evaluated for different terrains of India and is also compared with that of Cartosat-1 optical stereo DEMs. Using accurate GPS points as reference, TanDEM-X DEMs of Mumbai area with flat as well as low hilly terrain, Koyna area with high hilly terrain, rugged Himalayan terrain of Manali and Katerniaghat area with forest cover over flat terrain were evaluated...
This paper deals with the fusion of TanDEM-X raw DEMs in ascending and descending pass over Mumbai test area and enhance its quality. Before applying fusion method, a robust layover and shadow map has been calculated in ITP using TanDEM-X DEM and the corresponding slant range image. The selection of optimum weights for fusion has been based on height error map calculated from interferometric coherence...
Recently launched TanDEM-X SAR mission (June, 2010) aims to generate a consistent global DEM equaling HRTI-3 specification. In view of global DEM generation using TanDEM-X InSAR data, it is very important to evaluate their accuracy over various test areas. This paper presents the evaluation of DEM generated using interferometric technique from TanDEM-X data in and around Mumbai city in India. The...
Mean and standard deviation of backscattering coefficients (σ0) of RISAT-1 data acquired over Mumbai in hybrid and linear dual polarizations have been analysed for various land features. Classification accuracy between RISAT-1 hybrid polarimetric data and RADARSAT-2 simulated hybrid polarimetric data has been compared. Wishart supervised and Support Vector Machine (SVM) classifiers are used for this...
This paper is an attempt to help the beginners and the students to learn the basics of the SAR signal processing in a simple and easy way using MATLAB. The signal processing of SAR data is very important for generating various data products for different applications and analysis of land features. The SAR raw data for signal processing is a two dimensional array which contain sampled echoes in the...
ENVISAT ASAR images acquired during 2003–2007 were processed for landslide movement using PSInSAR and SBAS methods over Himalayan region. The mean velocity of the landslide movement obtained with ascending and descending pass data using PSInSAR is around ± 16 mm/yr and SBAS method gives −25 to 15 mm/yr with descending pass and −39 to 38 mm/yr with ascending pass data sets. The number of PS points...
Polarimetric Synthetic Aperture Radar (PolSAR) data is available at different frequencies and polarizations from various sensors like ALOS-PALSAR, Envisat ASAR, TerraSAR-X. This study compares the classification accuracies obtained with fully polarimetric and dual-polarization L-band ALOS-PALSAR data over Mumbai and Sundarban area. We have also compared dual polarized ALOS-PALSAR L-band TerraSAR-X...
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