Designing a spectral index to estimate vegetation water content from remote sensing data -: Part 2.: Validation and applications
Designing a spectral index to estimate vegetation water content from remote sensing data -: Part 2.: Validation and applications
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DOI：
10.1016/s0034-4257(02)00037-8
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发表时间：
2002-10-01
影响因子：
13.5
通讯作者：
Grégoire, JM
中科院分区：
文献类型：
--
作者：
Ceccato, P;Flasse, S;Grégoire, JM
全球植被水分指数（GVMI）是利用SPOT-VEGETATION数据快速、可靠地反演从局部到全球范围内的植被水分含量的一个指标。本文验证了GVMI与实地测量的植被含水量超过四个不同的生态系统在塞内加尔。其中两个地点显示，全球脆弱性管理指数得出的含水量与实地测量的含水量完全一致。其余两个网站显示的价值差异，但提供相同的演变随着时间的推移。生态系统之间的比较表明，全球脆弱性管理指数得出的含水量与以单位面积水量表示的含水量实地测量值一致。进一步的研究表明，全球植被质量指数与植被含水量无关，植被含水量以每单位生物量的含水量百分比表示。GVMI和NDVI方法之间的比较还表明，NDVI提供不同的信息（植被绿度），这是不直接相关的水量在植被。新的GVMI的潜在应用进行了讨论。(C)2002年爱思唯尔科技有限公司All rights reserved.
The Global Vegetation Moisture Index (GVMI) was developed to retrieve vegetation water content from local to global scale rapidly and reliably using SPOT-VEGETATION data. This paper validates the GVMI with field measurements of vegetation water content measured over four different ecosystems in Senegal. Two of the sites show exact concordance between GVMI-derived and field-measured water content. The remaining two sites show differences in value but provide identical evolution over time. Comparison between ecosystems illustrates that GVMI-derived water content is consistent with field measurements of water content expressed as a quantity of water per unit area. Additional study shows that GVMI is not related to the vegetation moisture content expressed as a percentage of water per quantity of biomass. Comparison between the GVMI and NDVI methods also illustrates that the NDVI provides different information (vegetation greenness), which is not directly related to the quantity of water in the vegetation. Potential applications of the new GVMI are also discussed. (C) 2002 Elsevier Science Inc. All rights reserved.