The Response Characteristics of TM Image Reflectance to the Arid Region of Soil Moisture
LI Bao-fu1，2，3, LI Wei-hong1，2*, CAO Zhi-chao1，2，3
1. Xinjiang Institute of Ecology and Geography，Chinese Academy of Sciences, Urumqi 830011, China 2. State Key Laboratory of Desert and Oasis Ecology, Urumqi 830011, China 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：The response characteristics of TM image to the soil moisture in the Tarim River are the research object. Selected the image spectrum (R), spectrum reciprocal (1/R), the logarithm of reciprocal spectrum lg(1/R) and removal normalized difference vegetation index (Rc) of four spectral index were selected to establish the soil moisture content prediction model, the variance test was used to validate the model significance, the model accuracy level was divided by the posterior variance examination. The results showed that: the model accuracy of the logarithm of reciprocal spectrum lg(1/R) prediction of soil moisture is the highest, and achieved a good level for the monitoring of soil moisture content (0～30 cm). The model accuracy of the spectral (R) and spectral reciprocal (1/R) prediction of soil moisture is lower than logarithm of reciprocal spectrum with only the individual layers (0～30, 0～50 cm, etc.) reaching the qualified level or narrouly qualified level. The model accuracy of the removal normalized difference vegetation index (Rc) prediction of soil moisture is the lowest. Besides, the best prediction depth of every model is the depth of 0～30 cm, and if the soil depth is too deep or too shallow, the prediction accuracy will decrease.
Key words：TM image reflectance;Arid;Soil moisture;Tarim river
李宝富1，2，3，李卫红1，2*，曹志超1，2，3 . TM影像反射率对干旱区土壤含水量的响应特征 [J]. 光谱学与光谱分析, 2011, 31(10): 2824-2828.
LI Bao-fu1，2，3, LI Wei-hong1，2*, CAO Zhi-chao1，2，3 . The Response Characteristics of TM Image Reflectance to the Arid Region of Soil Moisture . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(10): 2824-2828.
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