For further information about wetlands in US you can visit http://www.nwi.fws.gov/. Other interesting links related to remote sensing are the following WWW sites:

SPOT: http://www.spot.com/data/images/spot4/tetierA1.jpg

NASA: http://rst.gsfc.nasa.gov/TofC/table.html

NASA: http://www.nasa.gov/gallery/photo/index.html