Directional reflectance of light from landscapes on a long transect in Australia – forest to desert

IF 5.7 Q1 ENVIRONMENTAL SCIENCES

Science of Remote Sensing Pub Date : 2024-05-11 DOI:10.1016/j.srs.2024.100136

John R. Dymond , James D. Shepherd , Sam Gillingham

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Abstract

The reflectance of land and vegetation observed in satellite imagery depends on sun and viewing geometry. This bidirectional reflectance requires correction for monitoring changes in vegetation cover and condition. We used a digital camera mounted in a light aircraft, and fitted with a fisheye lens, to measure directional reflectance of a diverse range of landscapes along a long transect in Australia — between Brisbane and the Simpson desert. All, except one, of the measured directional reflectances were able to be characterised accurately (adjusted r² > 0.95) by the product of two analytical functions. The first, $G (θ_{1}, θ_{2})$ , which represents volume scattering, is a function of illumination and viewing zenith angles, $θ_{1} a n d θ_{2}$ , and has one parameter $k$ :

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澳大利亚从森林到沙漠长横断面景观的定向光反射率

卫星图像中观测到的土地和植被的反射率取决于太阳和观测几何形状。这种双向反射率需要校正，以监测植被覆盖和状况的变化。我们使用安装在轻型飞机上的数码相机和鱼眼镜头，沿澳大利亚布里斯班和辛普森沙漠之间的一条长横断面测量了各种地貌的定向反射率。除一处外，所有测得的定向反射率都可以通过两个分析函数的乘积来准确描述（调整后的 r2 > 0.95）。第一个函数 G(θ1,θ2)表示体积散射，是照明和观测天顶角 θ1 和 θ2 的函数，有一个参数 k：

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来源期刊

Science of Remote Sensing

CiteScore

12.20

自引率

0.00%

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