Full text: Mapping without the sun

transmissivity is computed using NDWI from Landsat TM, 
then, volume and interaction scatter are removed from 
observations based on some assumptions, finally, soil moisture 
change estimation algorithm is developed using surface scatter 
at two acquisitions. The results are validated using in-situ 
samples of 0-1 cm. The results showed than the algorithm can 
1 Measured 
•• .!/ 
Fig.2 The Validation of results for both soybean and com field at four polarizations 
be used at L-band, but not at S-band. It is the key in future 
work that the algorithm will be advanced to be used at higher 
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[1 l].Jianming Wang, J. Shi, Shengli Wu, Wei Liu, 2004, 
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[12] .Yang Hu, 2003, On the Modelling of Canopy Covered 
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This work was supported by funds from NSFC and CAS under 
grants 40671140 and kzcx2-yw-301. The EnviSat ASAR data 
were provided by ESA through the Category-1 ID: 1406.

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