FY-3A/MERSI植被指数区域适用性比较

Comparison of FY-3A/MERSI Vegetation Index Regional Applicability

为确定适用于宁夏不同类型区域的植被指数,基于研究区多时相FY-3A/MERSI和TERRA/MODIS数据,通过频率统计、误差分析方法比较了NDVI与EVI的适用性。结果表明:①宁夏全区,在低植被区EVI更有优势,在高植被区NDVI更有优势;②中部干旱带、南部山区、草地、旱地,在中度植被区,NDVI更有优势;③基于FY-3A/MERSI与TERRA/MODIS的EVI相关性高于NDVI、误差低于NDVI。比较FY-3A植被指数区域适用性为科学认识宁夏植被长势提供参考。

In order to identify suitable vegetation index for different types of regions in Ningxia. The applicability of NDVI and EVI was compared by frequency statistics and error analysis using multi-temporal FY-3A/MERSI and TERRA/MODIS data in the study area. The results showed that ①In whole area of Ningxia, EVI has more advantages in low vegetation area, and NDVI has more advantages in high vegetation area.②In medium vegetation area, NDVI has more advantages in middle arid area, southern mountainous area, grassland and dry land.③The correlation of EVI based on FY-3A/MERSI and TERRA/MODIS is higher than NDVI, and the error is lower than NDVI. Comparing the regional applicability of FY-3A vegetation index provides scientific reference for vegetation growth in Ningxia.