ATMOSPHERICALLY RESISTANT VEGETATION INDEX (ARVI) FOR EOS-MODIS
ATMOSPHERICALLY RESISTANT VEGETATION INDEX (ARVI) FOR EOS-MODIS
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DOI：
10.1109/36.134076
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发表时间：
1992-03-01
影响因子：
8.2
通讯作者：
TANRE, D
中科院分区：
文献类型：
--
作者：
KAUFMAN, YJ;TANRE, D
抗大气植被指数(ARVI)被提出并发展用于利用地球观测系统(EOS)MODIS传感器进行植被遥感。同样的指数也可用于Landsat TM和EOS-Hiris传感器的遥感。该指数利用了MODIS传感器中蓝色通道的存在，以及组成当前归一化植被指数的红色通道(0.66+/-0.025亩-m)和近红外通道(0.865+/-0.02亩-m)的存在。ARVI对大气影响的抵抗力(与NDVI相比)是通过对红色通道上的大气效应进行自校正过程来实现的，该过程使用蓝色和红色通道之间的辐射差异来校正红色通道中的辐射。对不同大气条件下的算术和自然地表光谱进行的辐射传输计算模拟表明，ARVI的动态范围与NDVI相似，但对大气影响的敏感度平均比NDVI低4倍。对于植被覆盖的表面，这种改善要比土壤好得多。对于中等到较小尺寸的气溶胶颗粒(例如，大陆、城市或烟雾气溶胶)，它比对于大颗粒(例如，海洋气溶胶或尘埃)要好得多。由于幸运的巧合，在ARVI定义中确定蓝波段辐射加权的参数--伽马值，对于气溶胶颗粒小到中等的植被区域(例如，人为气溶胶和烟雾)和对于颗粒尺寸较大的干旱区域(例如，尘埃)，也找到了相同的最佳值。因此，ARVI中的蓝色和红色通道的单个组合可用于所有或大多数遥感应用。由于ARVI具有良好的大气抵抗力，预计从MODIS遥感大多数陆地表面的植被指数将包括分子和臭氧校正，而不需要进一步的气溶胶校正，但沙尘条件除外，如在萨赫勒。
Atmospherically resistant vegetation index (ARVI) is proposed and developed to be used for remote sensing of vegetation from the Earth Observing System (EOS) MODIS sensor. The same index can be used for remote sensing from Landsat TM, and the EOS-HIRIS sensor. The index takes advantage of the presence of the blue channel (0.47 +/- 0.01-mu-m) in the MODIS sensor, in addition to the red (0.66 +/- 0.025-mu-m) and the near IR (0.865 +/- 0.02-mu-m) channels that compose the present normalized difference vegetation index (NDVI). The resistance of the ARVI to atmospheric effects (in comparison to the NDVI) is accomplished by a self-correction process for the atmospheric effect on the red channel, using the difference in the radiance between the blue and the red channels to correct the radiance in the red channel. Simulations using radiative transfer computations on arithmetic and natural surface spectra, for various atmospheric conditions, show that ARVI has a similar dynamic range to the NDVI, but is, on average, four times less sensitive to atmospheric effects than the NDVI. The improvement is much better for vegetated surfaces than for soils. It is much better for moderate to small size aerosol particles (e.g., continental, urban, or smoke aerosol) than for large particle size (e.g., maritime aerosol or dust). Due to a fortunate coincidence, the same optimal value of the parameter-gamma that defines the weighting of the blue band radiance in the ARVI definition, is found for vegetated areas with small to moderate aerosol particle size (e.g., anthropogenic aerosol and smoke) and for arid regions with large particle size (e.g., dust). Therefore, a single combination of the blue and the red channels in the ARVI may be used in all or most remote sensing applications. Due to the excellent atmospheric resistance of the ARVI, it is expected that remote sensing from MODIS of the vegetation index over most land surfaces will include molecular and ozone correction with no further need for aerosol correction, except for dust conditions, like in the Sahel.