USGS Gap Analysis Project Additional Data: Hydrologic Unit Codes [HUCs]
October 1, 2018
The Hydrologic Unit Code (HUC) is part of a hierarchical classification system for surface water drainage in the US (Seaber et al. 1987). The numerical code represents a cataloging unit of delineation. Vector format (i.e. polygon) data were compiled from United States Geological Survey (USGS) source - the Watershed Boundary Dataset (WBD). In order to include areas of large water bodies and ocean shorelines, an iterative process was used to expand polygons boundaries 5 kilometers extending from landward edges. This altered 12-digit code HUC dataset was used to delineate species ranges as part of the USGS Gap Analysis Project's species range and distribution modeling effort.
Citation Information
| Publication Year | 2018 |
|---|---|
| Title | USGS Gap Analysis Project Additional Data: Hydrologic Unit Codes [HUCs] |
| DOI | 10.5066/F7DZ0754 |
| Authors | Matthew J Rubino, Steven G Williams |
| Product Type | Data Release |
| Record Source | USGS Digital Object Identifier Catalog |
| USGS Organization | Science Analytics and Synthesis Program |
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