Class separability evaluation of desert types based on the hyperspectral reflectance characteristics
Few studies have used the characteristic variables extracted from the details of the hyperspectral reflec-tance curves of bare soil to evaluate the separability of various desert types.In this study,salt desert,gravel des-ert,mud desert,and desert in the lower reaches of the Shiyang River were used as the research objects,and cumu-lative difference,first-order differentiation,continuum removal,vegetation index calculation and principal compo-nent analysis were used to identify the hyperspectral reflectance features of various desert types,extract the key categorical variables,and quantify the degree of differentiation of various desert types.The results showed that(1)the absorption valleys at 446-600 nm and 2150-2285 nm differed significantly among the desert types.(2)the Carter index 1,Greenness Index,and Green NDVI hyper 2 differed significantly among the desert types.(3)The Modified Chlorophyll Absorption Ratio Index,Soil Adjusted Vegetation Index,and 2265 nm and 1790-1810 nm reflectance had larger weight values in constructing the principal component indexes;and(4)the differentiation index of each desert type:desert&salty desert>desert&muddy desert>muddy&salty desert>gravelly&salty desert>desert&gravelly desert>mud&gravelly desert.These findings provide ground verification and data sup-port for the remote sensing monitoring of deserts in the northwest Arid Zone.
万方数据
维普
