Influences of the illumination and viewing geometry on the vegetation indices

Liangpei Zhang; Hui Lin; Deren Li

doi:10.1117/12.466755

16 June 2003 Influences of the illumination and viewing geometry on the vegetation indices

Liangpei Zhang, Hui Lin, Deren Li

Proceedings Volume 4897, Multispectral and Hyperspectral Remote Sensing Instruments and Applications; (2003) https://doi.org/10.1117/12.466755
Event: Third International Asia-Pacific Environmental Remote Sensing Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2002, Hangzhou, China

Abstract

Vegetation indices have been widely used by the remote sensing community to monitor vegetation from space, both on regional and global scales. However, vegetation indices are sensitive to the illumination and viewing geometry. In order to assess this sensitivity, spectra of the five species of plant leaves were collected under the different illumination and viewing geometry. It was demonstrated that when the illumination angles were altered, the leaf spectral amplitudes would change; the vegetation indices would increase with the illumination angles. But the influences of the illumination angle alterations on the vegetation indices were different with the different sensors. For the vegetation index NDVI, the influences on AVHRR were the least, the largest of MODIS. But for the vegetation index SR, the influences on MODIS were the least, the largest of AVHRR. The vegetation index NDVI was also proved to be the more reliable than the vegetation index SR.

Citation Download Citation

Liangpei Zhang, Hui Lin, and Deren Li "Influences of the illumination and viewing geometry on the vegetation indices", Proc. SPIE 4897, Multispectral and Hyperspectral Remote Sensing Instruments and Applications, (16 June 2003); https://doi.org/10.1117/12.466755

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KEYWORDS

Vegetation

Sensors

MODIS

Reflectivity

Remote sensing

Atmospheric sensing

Near infrared

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