多种干旱遥感指数在临沂地区的适用性分析

为了研究临沂地区适合的干旱遥感指数,利用2012年4—11月MODIS数据反演了临沂地区的NDVI和EVI植被指数,分别构建了温度植被指数(TVDI)和植被供水指数(VSWI)。结合地面实测土壤相对湿度数据,建立了上述植被指数与土壤相对湿度的关系模型,并反演得到区域性的土壤墒情。通过比较多种干旱遥感指数的反演结果,研究了适宜于临沂地区的遥感干旱监测模型。结果表明:TVDI_(NDVI)、TVDI_(EVI)、VSWI_(NDVI)和VSWI_(EVI)4种干旱遥感指数与10~20 cm的土壤相对湿度均显著关系,82%通过0.01显著性检验,TVDI指数的相关系数总体比VSWI指数高5%,TVDI_(EVI)的相关系数比TVDI_(NDVI)指数高3%,VSWI_(NDVI)的相关系数比VSWI_(EVI)1%,差异较小。

The comparative application analysis of the several droughts monitoring index in Linyi district

The paper researched the droughts monitoring index suitable for Linyi District, it evaluated the TVDI and VSWI index and structured the TVDI and VSWI vegetationSindex by using MODIS data in Linyi district from April to November in 2012. Combined with the soil moisture measured data, established the relational model between vegetation index and soil relative humidity, and evaluated the soil moisture of the research region. Compared the inversion result of several droughts monitoring indices, obtained the most suitable drought monitoring model of Linyi district. The result shows that, there is a significant relationship between kinds of drought indices and 10 ~ 20cm of soil relative humidity, 82% passed 0.01 test of significant, The correlation coefficient TVDI index 5% higher than the overall VSWI index. The TVDIEVI index 3% is higher than TVDINDVI index. VSWINDVI index is higher than VSWIEVI, with 1% minor differences.