I'm looking to create a raster image of Pennsylvania, Maryland, and West Virginia using FIA data. I want to regress the different forest composition categories onto the reflected spectral data of MODIS imagery in order to fill in the gaps in the FIA data since it only covers points in the landscape, not pixels. I'm trying to use a grain size of 600 hectares. Does anyone know of a methodology for this process or have some articles or contacts that do? Thanks.