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基于地形调节植被指数估算长汀县植被覆盖度

DOI: 10.6046/gtzyyg.2015.01.26, PP. 164-171

Keywords: 植被覆盖度,地形调节植被指数(TAVI),归一化差值植被指数(NDVI)

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Abstract:

植被覆盖度遥感估算最常用的方法是基于植被指数构建模型,但大部分的植被指数没有考虑地形的影响。以福建省长汀县作为研究区,引入能消除地形影响的地形调节植被指数(topographyadjustedvegetationindex,TAVI),利用像元二分模型估算植被覆盖度,旨在研究TAVI对植被覆盖度估算结果的影响,并与基于归一化差值植被指数(normalizeddifferencevegetationindex,NDVI)估算的结果进行比较。根据目视效果和统计指标的分析表明:基于TAVI估算的植被覆盖度精度高于基于NDVI的估算结果,并能有效降低阴坡阳坡间的差异,提高阴坡区域植被覆盖度的估算精度。

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