GIS (Geographic Information Systems):

On Target GIS Tutorials (pdf):

GIS data and imagery sources.pdf
Satellite Image Viewers Compared.pdf

Other GIS Tutorial Sites and Worthwhile GIS Links:

Information on GIS and tutorials can be found at: http://webgis.wr.usgs.gov/globalgis

Additional GIS Sites:

GIS Hotlist (additional links)
Starpal Links

Souces for state remote sensing and GIS data layers:

ALABAMA	KENTUCKY	NORTH DAKOTA
ALASKA	LOUISIANA	OHIO
ARIZONA	MAINE	OKLAHOMA
ARKANSAS	MARYLAND	OREGON
CALIFORNIA	MASSACHUSETTS	PENNSYLVANIA
COLORADO	MICHIGAN	RHODE ISLAND
CONNECTICUT	MINNESOTA	SOUTH CAROLINA
DELAWARE	MISSISSIPPI	SOUTH DAKOTA
DIST. OF COLUMBIA	MISSOURI	TENNESSEE
FLORIDA	MONTANA	TEXAS
GEORGIA	NEBRASKA	UTAH
HAWAII	NEVADA	VERMONT
IDAHO	NEW HAMPSHIRE	VIRGINIA
ILLINOIS	NEW JERSEY	WASHINGTON
INDIANA	NEW MEXICO	WEST VIRGINIA
IOWA	NEW YORK	WISCONSIN
KANSAS	NORTH CAROLINA	WYOMING