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Simultaneous Estimation of LAI, PAR, FAPAR, and Surface Albedo at Multiple Spatial Scales From Top-of-Atmosphere Satellite Observations With Different Spatial Resolutions | IEEE Journals & Magazine | IEEE Xplore

Simultaneous Estimation of LAI, PAR, FAPAR, and Surface Albedo at Multiple Spatial Scales From Top-of-Atmosphere Satellite Observations With Different Spatial Resolutions


Abstract:

Current global land-surface parameter products are generally derived from surface reflectance data acquired by a single satellite sensor, which requires atmospheric corre...Show More

Abstract:

Current global land-surface parameter products are generally derived from surface reflectance data acquired by a single satellite sensor, which requires atmospheric corrections for top-of-atmosphere (TOA) reflectance data. The retrieval methods for different parameters are commonly based on different assumptions, as a result of which the estimated parameters are inconsistent in terms of physical detail. Furthermore, the currently available land-surface parameter products only have a limited number of spatial resolutions. These problems existing in the current land-surface parameter products greatly limit their applications in Earth sciences. This article proposes a novel approach to simultaneously estimate leaf area index (LAI), photosynthetically active radiation (PAR), fraction of absorbed photosynthetically active radiation (FAPAR), and surface albedo at multiple spatial scales from satellite TOA reflectance data with different spatial resolutions. Based on the average of multiyear Global Land Surface Satellite (GLASS) LAI product, an ensemble multiscale tree (EnMsT) was constructed to describe the initial conversion relationships among LAI values at different spatial scales. The EnMsT was coupled with a land-surface–atmosphere radiative transfer model to simulate TOA reflectance data with different spatial resolutions, which were compared with the corresponding satellite TOA reflectance data to update the LAI values of each node in the EnMsT. Finally, the estimated LAI values were input into the land-surface–atmosphere radiative transfer model to calculate PAR, FAPAR, and surface albedo values at different spatial resolutions. In this article, the method was applied to estimate LAI, PAR, FAPAR, and surface albedo at 28.9, 57.8, 115.6, 231.2, 462.4, and 924.8 m from Thematic Mapper (TM) or Enhanced Thematic Mapper Plus (ETM+) and Moderate Resolution Imaging Spectroradiometer (MODIS) TOA reflectance data at four sites with cropland and grassland biomes. The retrie...
Article Sequence Number: 4408321
Date of Publication: 04 September 2023

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