TRMM: http://trmm.gsfc.nasa.gov/
NLDAS: http://ldas.gsfc.nasa.gov/nldas/
GLDAS: http://ldas.gsfc.nasa.gov/gldas/
NARR: http://www.emc.ncep.noaa.gov/mmb/rreanl/
HydroSheds: http://hydrosheds.cr.usgs.gov/index.php
NHDPlus: http://www.horizon-systems.com/nhdplus/
STATSGO: http://dbwww.essc.psu.edu/dbtop/doc/statsgo/statsgo_info.html