Center for Spatial Analysis Technologies
| Description
The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 1970s to put into digital form a number of data layers which were of interest to the USGS. One of these data layers was the Hydrologic Units. The map is based on the Hydrologic Unit Maps published by the U.S. Geological Survey Office of Water Data Coordination, together with the list descriptions and name of region, subregion, accounting units, and cataloging unit. The hydrologic units are encoded with an eight- digit number that indicates the hydrologic region (first two digits), hydrologic subregion (second two digits), accounting unit (third two digits), and cataloging unit (fourth two digits). |
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![[small map]](/statewide/small/huc250.png){kind=small}
Screensize image file (916x1024 pixels) |
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![[large map]](/statewide/large/huc250.png){kind=small}
100 dpi image file (3400x3800 pixels) |
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![[download]](../download.gif){kind=small}
Data: 378 KB Zipped, 1.2 MB Unzipped, 350 KB Actual Size |
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![[metadata]](../metadata.gif){kind=small}
View Metadata |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://csat.er.usgs.gov/statewide/layers/huc250.html
Page Contact Information: webmaster-ga@usgs.gov
Page Last Modified: Wednesday, 07-Jun-2006 14:54:29 EDT
