通过野外采样和室内测定，研究了湖南省主要类型土壤反射光谱的剖面变化特性。
We studied reflecting spectral change characteristics in the depth profile of major soils in Hunan province through field sampling and lab analysis.
沙化土地光谱数据源分为单一地物类型级和复合地物类型级两种，野外测量时分别采取不同的采样方法。
Spectral data sources of sandy land included single surface feature and composite surface feature, and their spectral data were measured by different sampling methods.
野外测量的大气环境、目标背景和地物的热力学特性等因素的影响，使得野外测量地物目标表面光谱发射率变得较为复杂。
Field atmospheric conditions, the environmental background of target and the target's thermodynamic properties will make it difficult to collect target's spectral emissivity in field.
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