Статья

Evaluation of MODIS NDVI and NDWI for vegetation drought monitoring using Oklahoma Mesonet soil moisture data

Yingxin GuASRC Research and Technology Solutions USGS Earth Resources Observation and Science Center Sioux Falls South Dakota USAEric HuntNational Drought Mitigation Center University of Nebraska at Lincoln Lincoln Nebraska USABrian WardlowNational Drought Mitigation Center University of Nebraska at Lincoln Lincoln Nebraska USAJeffrey B. BasaraOklahoma Climatological Survey University of Oklahoma Norman Oklahoma USAJesslyn F. BrownUSGS Earth Resources Observation and Science Center Sioux Falls South Dakota USAJ. P. VerdinUSGS Earth Resources Observation and Science Center Sioux Falls South Dakota USA

2008en

ABI

Аннотация

The evaluation of the relationship between satellite‐derived vegetation indices (normalized difference vegetation index and normalized difference water index) and soil moisture improves our understanding of how these indices respond to soil moisture fluctuations. Soil moisture deficits are ultimately tied to drought stress on plants. The diverse terrain and climate of Oklahoma, the extensive soil moisture network of the Oklahoma Mesonet, and satellite‐derived indices from the Moderate Resolution Imaging Spectroradiometer (MODIS) provided an opportunity to study correlations between soil moisture and vegetation indices over the 2002–2006 growing seasons. Results showed that the correlation between both indices and the fractional water index (FWI) was highly dependent on land cover heterogeneity and soil type. Sites surrounded by relatively homogeneous vegetation cover with silt loam soils had the highest correlation between the FWI and both vegetation‐related indices (r∼0.73), while sites with heterogeneous vegetation cover and loam soils had the lowest correlation (r∼0.22).

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Идентификаторы

DOI: 10.1029/2008gl035772

Цитирования и источники

Цитирований: 3Использованных источников: 0

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