Environmental Data from the SAGE Center at the University of Wisconsin
In our book, The GIS Guide to Public Domain Data, we discussed where to find environmental spatial data and the merits of specific types of environmental data. One source that space did not permit us to include was the environmental resources available from the SAGE Center for Sustainability and the Global Environment from the University of Wisconsin-Madison. The data focuses on the categories of terrestrial ecosystems, hydrological systems, and climate, including such items as freight emissions in the state of Wisconsin, soil carbon and nitrogen samples, irrigated lands, and much more, both for Wisconsin and for the globe.
The holdings include some significant surprises, including east and southeast Asia urban expansion, global urban extents, land use, river discharges, crop lands, and much more.
This site is also the host of the Atlas of the Biosphere, a resource containing online maps and ArcGrid data sets about people, land use, ecosystems, and water resources. We examined this data set in our book but it is worth mentioning here because of its ease of use and rich data sets viewable online and as downloadable files.