| Investigation on dynamic changes of drought of winter wheat by TVDI index——Taking the Xingtai in Hebei province as an example |
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| DOI：10.7606/j.issn.1000-7601.2015.04.34 |
| Key Words: drought monitoring NDVI LST TVDI Xingtai Country |
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| Abstract: |
| Temperature Vegetation Dryness Index（TVDI）is an effective method for monitoring the dynamic changes of drought, and based on land surface soil moisture retrieval from optical and thermal-infrared remote sensing data. In 2010, TTVDI was calculated by Normalized Differential Vegetation Index (NVDI) and Land Surface Temperature (LST) data, that were derived from the MODIS data of winter wheat growing period in Xingtai county. We used TVDI for evaluate severe drought, and obtained a consistent result in comparison with the data of precipitation and soil moisture. The result showed that the deductive temperature of ground surface could be used as the actual value, considering the average error was 0.295℃ by a comparison between measured temperature and temperature retrieval from MOD11A2 data. There was a superior linear fitness between local TVDI value and relative humidity in 0～20 cm layer, with the maximal and minimal R2 were 0.722 of Qinghe and 0.598 of Renxia. These results suggest that TVDI can effectively reflect the actual drought in Xingtai county. |
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