青藏高原不同地表反射率对比试验

通过对2009年7月在高原主体上利用ASD公司的野外光谱仪FieldSpec3采集到的不同地表光谱曲线的分析,结果表明:不同的下垫面具有非常典型的地物反射光谱曲线,沙化地的反射曲线相对平滑,在350~1800nm区间除去在700nm和1400nm有两个吸收谷以外,其他地方都呈反射状态,沙化地根据地表状况不同表现出不同幅值的反射率;油菜地的反射特征为从350nm开始吸收,在550nm出现一个反射峰后开始反射,到700nm附近出现一个吸收谷,反射率开始急剧上升,到740nm上升到最大,反射率维持在一个高位值上变化,一直到930nm附近出现一个反射谷,在1130nm附近,反射率开始呈下降的趋势;草地的反射曲线兼具绿色植物和沙化地的特征。 

Contrastive Experiment of Reflectivity of Different Situation of Land-surface in Tibetan Plateau

We collected some information about reflectivity of different situation of land-surface in the Tibetan Plateau in July, 2009.We collected total 850 curves of spectrum by the FieldSpec3 of Analytical Spectral Devices (ASD)., Inc.After studied these curves of spectrum, we obtained some usable information about desertification and grass land and rape field.The studied result to show that there was markedly different reflectivity respective land-surface.The reflectivity characteristic of desertification is relative smooth, from 350nm to 1800nm there are two Absorb valley respective 700nm and 1400nm, other show slow reflect trend, and there are different max respective land-surface.The reflectivity character of Rape field show the character of typical green plant, beginning with 350nm there is one Absorb valley nearby 550nm, then it show to reflect, and nearby 700nm again emerge one Absorb valley, then the reflectivity show sharp ascendant trend, it reach max nearby 740nm, then the reflectivity keep in high value, after 1300nm it show to drop.The reflectivity character of grass land shows has it of green plant and desertification.