| 光谱学与光谱分析 |
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| 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 |
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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.
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Received: 2011-01-04
Accepted: 2011-03-29
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Corresponding Authors:
LI Wei-hong
E-mail: liwh@ms.xjb.ac.cn
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