A comparison of vegetation indices global set of TM images for EOS-MODIS
A comparison of vegetation indices global set of TM images for EOS-MODIS
复制标题
DOI：
10.1016/s0034-4257(96)00112-5
复制
发表时间：
1997-03-01
影响因子：
13.5
通讯作者：
vanLeeuwen, W
中科院分区：
文献类型：
--
作者：
Huete, AR;Liu, HQ;vanLeeuwen, W
对美国航天局大地卫星探路者全球土地覆盖试验场倡议提供的一组大地卫星专题成像仪图像进行了处理，以模拟中分辨率成像光谱仪（中分辨率成像光谱仪），即像素大小分辨率为250米的全球植被指数图像。这些地点包括寒带森林、温带针叶林、温带落叶林、热带雨林、草原、稀树草原和荒漠生物群落。比较了不同光谱植被指数（维斯）对植被条件敏感性的异同。所有的维斯都表现出与植被变化的定性关系。然而，有显着差异的维斯之间的沙漠，草原和森林生物群落。归一化植被指数（NDVI）是敏感的，主要是响应于高吸收的红色反射率的变化，在近红外波段（NIR）。因此，我们发现的归一化植被指数模仿红色反射率和饱和的森林覆盖的网站，而SARVI，相比之下，不饱和，并遵循近红外反射率的变化。在干旱和半干旱生物群落中，NDVI比SARVI对冠层背景变化更敏感。植被指数的行为之间的最大差异发生在万年青针叶林网站相对于落叶阔叶林和干燥，草地和灌木网站。这些差异似乎是有用的补充归一化差异植被指数，改善监测植被，与归一化差异植被指数敏感的吸收光合有效辐射的分数和SARVI更敏感的结构冠层参数，如叶面积指数和叶形态。（C）Elsevier Science Inc. 1997.
A set of Landsat Thematic Mapper images representing a wide range of vegetation conditions from the NASA Landsat Pathfinder, global land cover test site (GLCTS) initiative were processed to simulate the Moderate Resolution Imaging Spectroradiometer (MODIS), global vegetation index imagery at 250 m pixel size resolution. The sites included boreal forest, temperature coniferous forest, temperature deciduous forest, tropical rainforest, grassland, savanna, and desert biomes. Differences and similarities in sensitivity to vegetation conditions were compared among various spectral vegetation indices (VIs). All VIs showed a qualitative relationship to variations in vegetation. However, there were significant differences among the VIs over desert, grassland, and forested biomes. The normalized difference vegetation index (NDVI) was sensitive to and responded primarily to the highly absorbing red reflectance to variations in the near-infrared (NIR) band. As a result, we found the NDVI to mimic red reflectances and saturate over the forested sites while the SARVI, by contrast, did not saturate and followed variations in NIR reflectances. In the arid and semiarid biomes, the NDVI was much more sensitive to canopy background variations than the SARVI. Maximum differences among vegetation index behavior occurred over the evergreen needleleaf forest sites relative to the deciduous broadleaf forests and drier, grassland, and shrub sites. These differences appear to be useful in complementing the NDVI for improved monitoring of vegetation, with the NDVI sensitive to fraction of absorbed photosynthetic active radiation and the SARVI more sensitive to structural canopy parameters such as leaf area index and leaf morphology. (C)Elsevier Science Inc. 1997.