Modeling the Effects of Various Radiant Transfers in Mountainous Terrain on Sensor Response
Modeling the Effects of Various Radiant Transfers in Mountainous Terrain on Sensor Response
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DOI：
10.1109/tgrs.1981.350360
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发表时间：
1981-04
影响因子：
8.2
通讯作者：
D. Kimes;J. A. Kirchner
中科院分区：
文献类型：
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作者：
D. Kimes;J. A. Kirchner
在山区地形中，在对多光谱数据进行准确分类之前，需要考虑到由于相对于入射辐射源的坡度方向变化而引起的遥感光谱数据的变化。开发了一个模型，以研究与山区遥感有关的若干问题。该模型能够模拟各向异性源的辐照度（直接太阳能，天空，和相邻的斜坡通量）和双向反射特性的目标表面上的传感器响应的各种倾斜方向的影响。该模型被描述和利用来探索与两个实用的技术占传感器响应的地形效应的错误。技术#1是直接太阳源的简单余弦校正，而技术#2考虑了直接太阳源和漫射天空源。对于本研究的特定各向异性辐照度条件和朗伯场景，技术#1的相对显著误差（反射率误差> 11%）发生在斜率大于20°的所有波长处。当使用技术#2时，该误差减少了50%以上。随着数字地形数据与遥感数据相结合的方法的最近发展，应用这种技术已成为可能。
In mountainous terrain, variations in remotely sensed spectral data caused by variations of slope orientation with respect to sources of incident radiation need to be considered before accurate classification of multispectral data can be achieved. A model was developed to study a number of problems relevant to remote sensing in mountainous terrain. The model is capable of simulating the effects of anisotropic sources of irradiance (direct solar, sky, and adjacent slope fluxes) and bidirectional reflectance properties of the target surface on sensor response for various slope orientations. The model was described and utilized to explore the errors associated with two practical techniques for accounting for the topographic effect on sensor response. Technique #1 was a simple cosine correction of the direct solar source, while technique #2 considered both the direct solar and the diffuse sky sources. For the specific anisotropic irradiance conditions and Lambertian scenes of this study relatively significant errors (> 11-percent error in reflectance) of technique #1 occurred at all wavelengths with slope inclinations greater than 20°. This error was diminished by greater than 50 percent when technique #2 was used. With the recent development of methods for integrating digital terrain data with remote sensing data it has become possible to apply such techniques.