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With nothing but your Web browser, you can explore numerous Web sites with ready-made maps. Some Web sites allow you to build and investigate your own maps using menus and mapping tools. Others contain GIS-ready data sets that you can use with a GIS such as ArcView.
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Many Internet sites now provide data for free download to use with GIS software. Here are some of the national sites. Individual states may have local sites as well.
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Many locations on the Web incorporate map, aerial, radar, and satellite images as static complements to their offerings. While unchangeable, these can be useful additions to geographic explorations. Others embrace a host of possibilities. Some locations to visit include the following:
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Library of Congress
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 Map Collections 1544-1999
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NASA
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Earth Science Image Gallery
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Images from LandSat
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JPL Earth Sciences Home Page
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NASA Image Exchange
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SIR-C Mission Home Page
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Visualization of Remote Sensing Data
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NOAA
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Interactive Global Map of Sea Floor Topography Based on Satellite Altimetry & Ship Depth Soundings
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National Ocean Service
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National Weather Service
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Operational Significant Event Imagery Server
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Satellite's Eye Art Gallery
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USDA
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Forest Service, Data and Information Systems
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Forest Service, Forest Land Maps
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NASS 1992 Agriculture Census
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NASS Crop Maps
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National Agricultural Statistics Service
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Natural Resources Conservation Service
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NRCS Maps, Imagery, Data, & Analysis
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NRCS Technical Resources
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USGS
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National Atlas
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The National Map
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USGS: Maps, Imagery, and Publications
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USGS-Biological Resources
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Biological Resources Division
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Bird Species Map Page
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North American Breeding Bird Survey
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USGS-Geologic Resources
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Geology Discipline
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Latest Earthquake Information
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National Earthquake Information Center
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Near Real Time Earthquake List
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USGS-Water Resources
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 National Water Conditions
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 Water Resources Division
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