R package mod09nrt. Package for processing downloaded MODIS Surface reflectance Product HDF files. Specifically, MOD09 surface reflectance product files, and the associated MOD03 geolocation files (for MODIS-TERRA). The package will be most effective if the user installs MRTSwath (MODIS Reprojection Tool for swath products; <>, and adds the directory with the MRTSwath executable to the default R PATH by editing  /.Rprofile.