For the purpose of mapping heavy metal concentrations, a list of environmental predictors have been prepared using the data available from the USGS [1] and the National Atlas [2].
The dataset consists of 14 gridded maps, possibly extendable to 130 grids if one also includes the indicators. Description of each grid is available in the *.rdc file.
USGS / National Atlas
Attachment | Size |
---|---|
usgrids5km.zip [4] | 5.54 MB |
Links:
[1] http://www.usgs.gov/pubprod/data.html
[2] http://nationalatlas.gov/
[3] http://spatial-analyst.net/book/node/8
[4] http://spatial-analyst.net/book/system/files/usgrids5km.zip
[5] http://spatial-analyst.net/book/node/389