Vegetation optical depth (VOD): review of SMAP products and prospects for agricultural applications in the southeastern Argentine Pampas region

Authors

DOI:

https://doi.org/10.59069/83nqhd97

Keywords:

vegetation water status, crops, water deficit, passive microwaves, remote sensing

Abstract

Microwave observations at frequencies between 1-2 GHz (L-band) are sensitive to surface soil moisture (SM) and vegetation water content, which can be parameterized by vegetation optical depth (VOD). The aim of this work was to present the physical basis of passive microwave measurements and a preliminary analysis of vegetation water dynamics in the southeastern Pampean Region by observing VOD and SM time series from the Soil Moisture Active Passive mission (SMAP). To complement these analyses, observations of normalized difference vegetation index (NDVI) and land surface temperature (LST) obtained in the field and derived from measurements recorded by Moderate-Resolution Imaging Spectroradiometer (MODIS) sensor were incorporated. The results showed that VOD has the capacity to determine sub-weekly variations related to water content in vegetation through coupled behaviors with SM and LST under homogeneous surface conditions. Particularly, localized increases in LST were observed to coincide with decreases in VOD during summer seasons. These observations demonstrated the potential of VOD both for monitoring vegetation water dynamics at a sub-weekly scale and detecting punctual water stress events.

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2024-12-12

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Vegetation optical depth (VOD): review of SMAP products and prospects for agricultural applications in the southeastern Argentine Pampas region. (2024). Journal of Engineering Geology and the Environment, 51, ee021. https://doi.org/10.59069/83nqhd97