Vegetation water content mapping using Landsat data derived normalized difference water index for corn and soybeans

被引:585
作者
Jackson, TJ
Chen, DY
Cosh, M
Li, FQ
Anderson, M
Walthall, C
Doriaswamy, P
Hunt, ER
机构
[1] USDA ARS, Hydrol & Remote Sensing Lab, Beltsville, MD 20705 USA
[2] Univ Manchester, Manchester Ctr Civil & Construct Engn, Manchester, Lancs, England
[3] Univ Wisconsin, Madison, WI 53705 USA
关键词
vegetation water content; Landsat; NDWI;
D O I
10.1016/j.rse.2003.10.021
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Information about vegetation water content (VWC) has widespread utility in agriculture, forestry, and hydrology. It is also useful in retrieving soil moisture from microwave remote sensing observations. Providing a VWC estimate allows us to control a degree of freedom in the soil moisture retrieval process. However, these must be available in a timely fashion in order to be of value to routine applications, especially soil moisture retrieval. As part of the Soil Moisture Experiments 2002 (SMEX02), the potential of using satellite spectral reflectance measurements to map and monitor VWC for corn and soybean canopies was evaluated. Landsat Thematic Mapper and Enhanced Thematic Mapper Plus data and ground-based VWC measurements were used to establish relationships based on remotely sensed indices. The two indices studied were the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Water Index (NDWI). The NDVI saturated during the study period while the NDWI continued to reflect changes in VWC. NDWI was found to be superior based upon a quantitative analysis of bias and standard error. The method developed was used to map daily VWC for the watershed over the 1-month experiment period. It was also extended to a larger regional domain. In order to develop more robust and operational methods, we need to look at how we can utilize the MODIS instruments on the Terra and Aqua platforms, which can provide daily temporal coverage. (C) 2003 Elsevier Inc. All rights reserved.
引用
收藏
页码:475 / 482
页数:8
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