Data source
US GIS data:
TIGER/Line Shapefiles 2009
GIS Datasets by categories Geodata.gov
Global GIS data:
EDEN Data Archive [http://ergodd.zoo.ox.ac.uk/eden/index.php?p=4]
DIVA-GIS [http://www.diva-gis.org/Data]
Imagery:
Landsat Imagery and other
Global Visualization Viewer
Earth Explorer
HSI - Hyperspectral data:
add links to free data and its short description
SLT (sea level temperature):
add links to free data and its short description
Lidar:
Resource web links
USGS Lidar
ASPRS resource for Lidar
Applied Imagery
KML:
add links to free data and its short description