不同含水量土壤高光譜二向性反射特征研究
發(fā)布時間:2019-06-12 06:44
【摘要】:【目的】探討高光譜遙感土壤含水量對土壤二向性反射分布函數(shù)(bidirectional reflectance distribution function,BRDF)的影響,可為改進土壤含水量高光譜遙感反演機理模型,提高反演精度奠定重要基礎(chǔ)。【方法】該研究在室內(nèi)條件下對含水量為5%~45%(按5%遞增)的土樣進行多角度光譜測定,分析光源天頂角、觀測天頂角、觀測方位角及含水量不同對土壤二向性反射特征的影響!窘Y(jié)果與結(jié)論】由于土壤表面顆粒之間的相互遮蔽,土壤BRDF隨光源天頂角的增加而增大,隨觀測天頂角的減小而降低,且土壤BRDF隨觀測天頂角的變化與波長有關(guān)。后向散射方向的土壤BRDF最高,前向散射方向的土壤BRDF最小。在400~1 400nm波段范圍內(nèi),當(dāng)土壤含水量小于田間持水量時,土壤BRDF值隨含水量的增加而降低;大于田間持水量時,土壤BRDF值隨含水量的增加而增加。但在波長1 400~2 400nm范圍內(nèi),不同的觀測位置下,土壤含水量不同引起土壤BRDF的變化沒有明顯規(guī)律。
[Abstract]:[objective] to explore the effect of hyperspectral remote sensing soil water content on soil bidirectional reflection distribution function (bidirectional reflectance distribution function,BRDF), which can lay an important foundation for improving hyperspectral remote sensing inversion mechanism model of soil water content and improving inversion accuracy. [methods] the soil samples with water content of 5% 鈮,
本文編號:2497819
[Abstract]:[objective] to explore the effect of hyperspectral remote sensing soil water content on soil bidirectional reflection distribution function (bidirectional reflectance distribution function,BRDF), which can lay an important foundation for improving hyperspectral remote sensing inversion mechanism model of soil water content and improving inversion accuracy. [methods] the soil samples with water content of 5% 鈮,
本文編號:2497819
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