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The root zone soil moisture estimates used by USDA-FAS are generated using the modified Palmer model. This baseline model was extended to by adding a data assimilation (DA) unit that allow us to routinely ingest satellite-based soil moisture observations. The current DA system relies on observations obtained from the Soil Moisture Ocean Salinity Mission (SMOS). Preliminary analysis, however, demonstrated...
Only the photosynthetically active radiation (PAR) absorbed by chlorophyll (chl) throughout a canopy, not the PAR absorbed by the foliage of the canopy or the PAR absorbed by the entire canopy, is potentially available for vegetation photosynthesis. This mechanism has motivated us to produce the products of fraction of absorbed PAR (fAPAR) by chlorophyll throughout the canopy (fAPARchl). Early results...
A primary operational goal of the United States Department of Agriculture (USDA) is to improve foreign market access for U.S. agricultural products. A large fraction of this crop condition assessment is based on satellite imagery and ground data analysis. The baseline soil moisture estimates that are currently used for this analysis are based on output from the modified Palmer two-layer soil moisture...
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