Retrieval of High-Resolution Vegetation Optical Depth from Sentinel-1 Data over a Grassland Region in the Heihe River Basin - Archive ouverte HAL Access content directly
Journal Articles Remote Sensing Year : 2022

Retrieval of High-Resolution Vegetation Optical Depth from Sentinel-1 Data over a Grassland Region in the Heihe River Basin

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Xiaojing Bai
  • Function : Author
Frédéric Frappart
Xiaojun Li
Mingguo Ma
Xin Li
Tao Che

Abstract

Vegetation optical depth (VOD), as a microwave-based estimate of vegetation water and biomass content, is increasingly used to study the impact of global climate and environmental changes on vegetation. However, current global operational VOD products have a coarse spatial resolution (~25 km), which limits their use for agriculture management and vegetation dynamics monitoring at regional scales (1–5 km). This study aims to retrieve high-resolution VOD from the C-band Sentinel-1 backscatter data over a grassland of the Heihe River Basin in northwestern China. The proposed approach used an analytical solution of a simplified Water Cloud Model (WCM), constrained by given soil moisture estimates, to invert VOD over grassland with 1 km spatial resolution during the 2018–2020 period. Our results showed that the VOD estimates exhibited large spatial variability and strong seasonal variations. Furthermore, the dynamics of VOD estimates agreed well with optical vegetation indices, i.e., the mean temporal correlations with normalized difference vegetation index (NDVI), enhanced vegetation index (EVI), and leaf area index (LAI) were 0.76, 0.75, and 0.75, respectively, suggesting that the VOD retrievals could precisely capture the dynamics of grassland.
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Dates and versions

hal-03877849 , version 1 (29-11-2022)

Licence

Attribution - CC BY 4.0

Identifiers

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Zhilan Zhou, Lei Fan, Gabrielle de Lannoy, Xiangzhuo Liu, Jian Peng, et al.. Retrieval of High-Resolution Vegetation Optical Depth from Sentinel-1 Data over a Grassland Region in the Heihe River Basin. Remote Sensing, 2022, 14 (21), pp.5468. ⟨10.3390/rs14215468⟩. ⟨hal-03877849⟩
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