Assessment and extension of the MODIS F_PAR products in temperate forests of the eastern United States

Abstract

Spatial and temporal variability in the quality of the collection 4 and 5 MODIS F_PAR products were examined over a 1.1 million km² region dominated by temperate forests. The MODIS F_PAR products were parsed into different quality levels based on the retrieval method of the F_PAR estimates, and the spatial coverage of the different quality MODIS subsets was examined through time and by land cover. The spatial extent of good quality F_PAR estimates, derived from the main radiative transfer algorithm without saturation, was found to be quite limited, particularly during the growing season. The majority of the MODIS C4 F_PAR retrievals were derived from the back‐up, empirically based algorithm. The C5 products available to date showed greater data quality but still had limitations in forested areas. As an alternative to using the lower‐quality MODIS F_PAR data, we explored the utility of estimating F_PAR from the more spatially extensive (and higher resolution) MODIS NDVI product using a simple, regionally based linear regression. A strong linear relationship between high quality MODIS NDVI and F_PAR products within our study site was found, indicating its utility for estimating F_PAR at regional scales where good quality retrievals from the MODIS algorithm are not available and where higher resolution F_PAR maps are desired. We discuss these results and their significance for down‐stream MODIS users.