Three types of drought are commonly noted including meteorological, agricultural, and hydrological droughts. This paper presents a synergistic approach spatially and temporarily between two types of drought indices associated with two reference years of 1987 and 2000. Both drought indices of TVDIs and RWSI can be tied to get her to address soil moisture dynamics and drought impacts. When the values of RWSI may be integrated with TVDI SAVI, TVDI ANDVI and TVDI MSAVI for drought assessment, we found that the shortage ofsoil water in 1987 was more severe than that in 2000. However,the use of TVDI NDVI cannot draw on the same conclusion. It was due to that TVDIs are suitable for monitoring situations of wet, normaland light dry conditions when RWSI < 0.752. In the situation ofmedium dry as the value of RWSI is smaller than or equal to 0.8, the TVDIs can still monitor drought correctly. Nevertheless, whendealing with medium dry and heavy dry as the value of RWSI is greater than 0.8, TVDIs cannot correctly portray the situation of water shortage for drought assessment. As a consequence, TVDIs should not be used to monitor the medium and heavy drought (RWSI > 0.8)
Three types of drought are commonly noted including meteorological, agricultural, and hydrological droughts. This paper presents a synergistic approach spatially and temporarily between two types of drought indices associated with two reference years of 1987 and 2000. Both drought indices of TVDIs and RWSI can be tied to get her to address soil moisture dynamics and drought impacts. When the values of RWSI may be integrated with TVDI SAVI, TVDI ANDVI and TVDI MSAVI for drought assessment, we found that the shortage ofsoil water in 1987 was more severe than that in 2000. However,the use of TVDI NDVI cannot draw on the same conclusion. It was due to that TVDIs are suitable for monitoring situations of wet, normaland light dry conditions when RWSI < 0.752. In the situation ofmedium dry as the value of RWSI is smaller than or equal to 0.8, the TVDIs can still monitor drought correctly. Nevertheless, whendealing with medium dry and heavy dry as the value of RWSI is greater than 0.8, TVDIs cannot correctly portray the situation of water shortage for drought assessment. As a consequence, TVDIs should not be used to monitor the medium and heavy drought (RWSI > 0.8)
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