Water Resources NSDI Node

Retrieval for spatial data set aquifers_us

Principal aquifers of the 48 contiguous United States

Metadata

SEE METADATA FOR aquifers_us NOW!

Metadata -- "data about data." A metadata file is available and may contain important information about this spatial data set. We strongly recommend that you read the metadata file before making any use of data set aquifers_us. (For information about metadata in general, click here).

Other Information Sources

GIF image showing simplified views of the data sets

Shape Files

URL (click to retrieve - see instructions below)	Description	Size (bytes)
http://water.usgs.gov/GIS/dsdl/aquifrp025.tar.gz	Full Coverage	Unknown

Spatial Data Tranfer Standard (SDTS) Files

URL (click to retrieve - see instructions below)	Description	Size (bytes)
http://water.usgs.gov/GIS/dsdl/usaq.tar.gz	Full Coverage	Unknown

Retrieval Information

Please remember that spatial data files typically are very big! A 28.8K modem, for example, takes about 10 minutes to download a 1 MByte file, even longer if there's network traffic. Plan accordingly.

Multiple files may be joined together by the GNU "tar" utility, tar.exe. These files usually are identified by the "tar" or "tgz" extension.

Shape files typically include at least 3 files: .shp, .shx, and .dbf . You must retrieve all 3 for the shape files to work properly. The files sometimes are combined into a tar file. Shape files often are produced in geographic coordinates (lat/lon) regardless of the original projection. Please see the metadata for more information.

USGS Water

GIS

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