Applicability of TVDI in Monitoring Drought in Longdong Area of Gansu, China

doi:10.7522/j.issn.1000-694X.2015.00181

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (1): 132-139.DOI: 10.7522/j.issn.1000-694X.2015.00181

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Applicability of TVDI in Monitoring Drought in Longdong Area of Gansu, China

Sha Sha, Guo Ni, Li Yaohui, Hu Die, Wang Lijuan

Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster Reduction, Institute of Arid Meteorology, CMA, Lanzhou 730020, China

Received:2015-09-16 Revised:2015-11-30 Online:2017-01-20 Published:2017-01-20

Abstract

Abstract: Clear principle and concise physical meanings make Temperature Vegetation Dryness Index (TVDI) be a wildly used method in drought monitoring. It was not temporal comparable that building feature space by using single time remote sensing data in most former studies. In this paper, NDVI-LST, EVI-LST and SAVI-LST feature space is building by history MODIS data and the applicability is discussed. The results showed that: (1) In over all, TVDI method can be used to monitoring the Relative Soil Moisture (RSM) status in Longdong area. The correlation between TVDI calculated by EVI-LST space and RSM is highest. (2) Land Surface Temperature (LST) corrected by DEM improved TVDI method. In one hand, goodness of fitting of the dry and wet edge is improved. On the other hand, the correlation between TVDI and RSM is improved in a manner. (3) Building feature space though history remote sensing data is a reasonable and feasible method. Temporal and spatial comparable are enhanced by this method. TVDI indicated the history RSM spatial distribution every single year well and the variance of RSM in different year well too.

Key words: TVDI, DEM, MODIS

CLC Number:

S152.7
S127

Sha Sha, Guo Ni, Li Yaohui, Hu Die, Wang Lijuan. Applicability of TVDI in Monitoring Drought in Longdong Area of Gansu, China[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(1): 132-139.

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Applicability of TVDI in Monitoring Drought in Longdong Area of Gansu, China

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