南方丘陵区植被覆盖度遥感估算的地形效应评估

发布时间：2018-01-16 15:13

本文关键词：南方丘陵区植被覆盖度遥感估算的地形效应评估　出处：《遥感学报》2017年01期 　论文类型：期刊论文

【摘要】：植被覆盖变化是生态环境领域的核心研究内容之一,但其估算精度常受到地形效应、土壤背景、大气效应等各种因素影响。以Landsat 8 OLI为遥感数据源,基于像元二分模型,分别利用归一化差值植被指数(NDVI)、经Cosine-C校正的归一化差值植被指数(NDVI)和归一化差值山地植被指数(NDMVI)建立植被覆盖度估算模型,以评估南方丘陵区植被覆盖度的地形效应。结果表明,3种植被覆盖度估算模型均能削弱地形效应,但消除或抑制地形效应影响的能力不同。比较而言,基于NDMVI指数构建的植被覆盖度估算模型的地形效应最小,更适合地形复杂区域的植被覆盖度遥感估算;基于Cosine-C校正的NDVI植被指数构建的植被覆盖度估算模型的地形效应次之,但存在一定的过度校正现象;基于NDVI植被指数构建的植被覆盖度估算模型的地形效应最大,尤其当坡度≥10°时,阴坡植被覆盖度比阳坡明显偏低。
[Abstract]:Vegetation cover change is one of the core research contents in the field of ecological environment, but its estimation accuracy is often affected by topographic effect and soil background. Taking Landsat 8 OLI as remote sensing data source and based on pixel dichotomy model, normalized difference vegetation index (NDVI) was used. The normalized difference vegetation index (NDVI) and the normalized difference mountain vegetation index (NDMVI) corrected by Cosine-C were used to establish the estimation model of vegetation coverage. In order to evaluate the topographic effect of vegetation coverage in the southern hilly region, the results showed that the topographic effect could be weakened by the estimation models of the vegetation coverage, but the ability to eliminate or suppress the topographic effect was different. The vegetation coverage estimation model based on NDMVI index has the least topographic effect and is more suitable for remote sensing estimation of vegetation coverage in complex terrain areas. The topographic effect of vegetation coverage estimation model based on NDVI vegetation index based on Cosine-C correction is the second, but there is a certain phenomenon of overcorrection. The vegetation coverage estimation model based on NDVI vegetation index has the largest topographic effect, especially when the slope is more than 10 掳, the vegetation coverage of the shady slope is obviously lower than that of the sunny slope.
【作者单位】：龙岩学院资源工程学院;中国科学院遥感与数字地球研究所;深圳市建筑科学研究院股份有限公司;哈尔滨工业大学深圳研究生院;
【基金】：福建省自然科学基金(编号:2012D104)~~
【分类号】：TP79;Q948
【正文快照】： 引用格式:吴志杰,何国金,黄绍霖,王猛猛,林金堂.2017.南方丘陵区植被覆盖度遥感估算的地形效应评估.遥感学报,21(1):159 167Wu Z J,He G J,Huang S L,Wang M M and Lin J T.2017.Terrain effects assessment on remotely sensed fractionalvegetation cover in hilly area of

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