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7 December 2006 Tree height estimation in Tundi reserved forest using SAR interferometry
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This study describes the use of SAR interferometric technique, coherence technique and backscattering coefficient data for the estimation of canopy height in forest area. The study area is Tundi Reserved Forest falling in Dhanbad district of Jharkhand state in India. Most predominant species is Shorea robusta (Sal) constituting the top storey of the forest with maximum height up to 20 m. For the purpose of validation, Ground Truth locations were taken on the basis of variability in the area. At ground truth location, sample plots were selected for the measurement of stand heights for the forest stands of different age and height categories. Interferometric SAR technique was used to generate Digital Elevation Model (DEM) in terms of Top of the Canopy Digital Surface Model (TCDSM). For this, Radarsat SAR interferometric data pair of 12 February and 7 March, 2004 were selected. The baseline for this pair was 643 m. The TCDSM at ground truth location was subtracted from the DEM obtained at clear-cut areas. The value of tree height was 8.1 m as against the measured value of 9m. The two date SLC data set (17 April and 22 May, 2004) of Envisat- ASAR were also used for the study of coherence pattern and its relation to forest height. Averages of coherence values for each of the GT sites with stand heights as well as ground height were derived using 5×5 pixel windows. The coherence values with the ground measured stand heights showed a high correlation. Coherence has been shown to be efficient for establishment of forest stand height in a forest environment. Thus, this paper demonstrates that SAR derived TCDSM and coherence can be used as a useful tool along with intensity data for the measurement of tree parameters.
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Praveen Kumar, A. P. Krishna, M. S. Nathawat, C. P Singh, A. K. Kandya, Shiv Mohan, and . Ajai "Tree height estimation in Tundi reserved forest using SAR interferometry", Proc. SPIE 6410, Microwave Remote Sensing of the Atmosphere and Environment V, 641004 (7 December 2006);

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