| Investigation on dynamic changes of drought in Heilongjiang Province based on temperature vegetation drought index |
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| DOI：10.7606/j.issn.1000-7601.2017.04.42 |
| Key Words: temperature vegetation drought index MODIS classification of drought grades Heilongjiang Province |
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| Abstract: |
| To carry out dynamic monitoring of the drought in Heilongjiang Province in 2015, MODIS data from June to September were used to calculate temperature vegetation drought index (TVDI). Baesd on the agricultural drought grade division standard of soil relative humidity and TVDI data of ten days as a unit over the past 15 years from 40 dry farming site, TVDI drought monitoring level was set. The agricultural drought grade division standard were verified by the soil relative humidity data of field survey in 2011, and the accuracy of the verified results reached 83%. The results showed there were five levels of TVDI value: no drought (TVDI<0.46)，light drought (0.46 |