基于Landsat8 OLI影像干旱区绿洲土壤含盐量反演

黄晓宇, 王雪梅, 卡吾恰提·白山

Inversion of soil salinity of an oasis in an arid area based on Landsat8 OLI images

HUANG Xiaoyu, WANG Xuemei, KAWUQIATI Baishan

表1 光谱指数计算公式

Tab.1 Calculation formulas of spectral indexes

光谱指数 计算公式① 参考文献 NDVI NDVI=(NIR-Red)/(NIR+Red) [10] ENDVI ENDVI=(NIR+SWIR2-Red)/(NIR+SWIR2+Red) [10] DVI DVI=NIR-Red [10] CRSI CRSI=[(NIR·Red-Green·Blue)/(NIR·Red+Green·Blue)]0.5 [15] EVI EVI=2.5[(NIR-Red)/(NIR+6Red-7.5Blue+1)] [12] EEVI EEVI=2.5[(NIR+SWIR1-Red)/(NIR+SWIR1+6Red-7.5Blue+1)] [12] NDSI NDSI=(Red-NIR)/(Red+NIR) [17] S3 S3=(Green·Red)/Blue [17] S5 S5=(Blue·Red)/Green [17] SI4 SI4= ( G r e e n 2 + R e d 2 ) 0.5 [10] SI-T SI-T=(Red/NIR)×100 [18]