Ms. Anitha Dasari Profile

Anitha Dasari

at Space Applications Ctr

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Proceedings Article | 7 December 2006 Paper

Multifrequency SAR signatures of forest class covering parts of Rajpipla, Gujarat

Anitha Dasari, Shiv Mohan, A. Ajai, Bharat Patel

Proceedings Volume 6410, 641005 (2006) https://doi.org/10.1117/12.697911

KEYWORDS: Backscatter, Radar, Polarization, Synthetic aperture radar, X band, Vegetation, Scattering, L band, Calibration, Data acquisition

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Multi-frequency SAR observation over forested areas has been the subject of research owing to the frequency dependence on the contribution of radar backscatter from different parts of the vegetation canopy. The multi-frequency SAR data at P-, L-, C- and X-band was acquired over Rajpipla site (Gujarat). All the channels were in quad-pole mode except X-SAR, which was in HH and VV-polarization mode. The study area comprises of the dry and moist deciduous forest. The moist deciduous forest is not evergreen and shed their leaves during March-April. Teak (Tectona grandis) is the dominant species in the moist deciduous forest area. Dry deciduous trees are mainly khakhar (Butea monosperma). Multifrequency SAR data was processed to get geo-referenced images and all the images were co-registered. Images were converted to the backscattering image using the calibration function. For the purpose of ground verification, ground data was obtained at different locations. Ground data consisted of measurements on tree height, diameter at breast height, basal girth, crown diameter etc. for each location; measurements were done in 10m by 10 m area. The analysis of the data was carried out in relation to comparison of backscattering coefficient in different frequencies and polarizations. In general, forest type was better seen in X-band image as compared to other classes. However, X- and C-band could be comparable in terms of forest classes. Further, backscattering coefficient increases with frequency except in P-band. However, P-band showed best correlation with biomass as compared to other channels.

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