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USGS Gap Analysis Project - Additional Data – Hydrography


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USGS - Core Science Analytics, Synthesis, and Library - Gap Analysis Project, 20110222, USGS Gap Analysis Project - Additional Data – Hydrography: U.S. Geological Survey,


Water and its location on the landscape are important aspects of a species distribution. A number of water related data layers were used to refine these species models. These include water type (i.e. flowing, open/standing), distance to and from water, and stream flow and underlying gradient. The source for this data was the USGS National Hydrography Dataset (NHD)(USGS 2007). Hydrographic features were divided into three types: flowing water, open/standing water, and wet vegetation. These feature types were extracted from the NHD by selecting the corresponding codes (the FCODE attribute) in datatables and creating seperate datasets for each data type. To facilitate their use in spatial modeling, these feature types were converted into [...]


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Additional data, such as hydrography, are used in the GAP species modeling process. Water-related features identified as relevant to species habitat are used with this hydorgraphy data to determine habitat suitability in a spatially explicit way.


Spatial Services

ScienceBase WMS


  • State CHAT Data Community (CHAT-DC)
  • US Fish and Wildlife Service (USFWS)



Data source
Input directly

Additional Information


Type Scheme Key
DOI 10.5066/F7JM28J1

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