http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/AVHRR

Full Description of AVHRR sensor

http://www.umac.org/

Upper Midwest Airspace Consortium

http://www.kars.ku.edu/

Kansas Applied Remote Sensing Program

http://rangeview.arizona.edu/

GeoSpatial Tools for Natural Resource Management

http://www.ssec.wisc.edu/data/

Univ. of Wisconsin-Madison, Space Science and Engineering Center

http://cnrit.tamu.edu/cgrm/

Texas A&M University Center for Grazinglands and Range Management

http://www26.statcan.ca/ccap-peec/overview-apercu-eng.jsp

Statistics Canada - Crop Condition Assessment Program

http://pekko.geog.umd.edu/usda/beta/

USDA/FAS Worldwide MODIS GLAM Database

http://www.pecad.fas.usda.gov/cropexplorer/modis_summary/

USDA/FAS MODIS Crop Explorer

http://rapidfire.sci.gsfc.nasa.gov/

MODIS Rapid Response System

http://modis.gsfc.nasa.gov/

Modis Info at NASA Goddard Space Flight Center

http://www.drought.gov/portal/server.pt

National Integrated Drought Information System

http://gisdata.usgs.net/website/Drought_Monitoring

USGS Drought Monitoring - VegDRI

http://drought.unl.edu/

National Drought Mitigation Center

http://www.ncdc.noaa.gov/oa/ncdc.html

National Climactic Data Center

http://www.rcc-acis.org/

Applied Climactic Information System