USGS Gap Analysis Project - Additional Data – Hydrography
Dates
Publication Date
2011-02-22
Start Date
1999-04-28
End Date
2004-07-26
Citation
USGS - Core Science Analytics, Synthesis, and Library - Gap Analysis Project, 20110222, USGS Gap Analysis Project - Additional Data – Hydrography: U.S. Geological Survey, https://doi.org/10.5066/F7JM28J1.
Summary
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 [...]
Summary
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 grids and combined into 16 catagories where feature types overlapped. For each region there is the possiblity of having up to 21 different hydrographic buffer layers and within a model it is possible to have up to 72 different permutations of these layers. The coding of the layer names is as follows: salinity(s), type(t), velocity(v), and null(n). s0t1v0n0 --> All (0) Flowing (1) All (0) None (0) All types of flowing water with no masks s0t1v0n1 --> All (0) Flowing (1) All (0) Standing (1) All types of flowing water with standing water masked out s0t1v1n1 --> All (0) Flowing (1) Fast Only (1) Slow & standing (1) All types of fast flowing water with slow & standing water masked out s0t1v2n0 --> All (0) Flowing (1) Slow Only (2) Fast (0) All types of slow flowing water with fast water masked out s0t1v2n1 --> All (0) Flowing (1) Slow Only (2) Fast & standing (1) All types of slow flowing water with fast water & standing water masked out s0t2v0n0 --> All (0) Standing (2) n/a (0) None (0) All types of standing (open) water with no masks s0t2v0n1 --> All (0) Standing (2) n/a (0) Flowing (1) All types of standing (open) water with flowing water masked out s0t3v0n0 --> All (0) Wet Veg (3) n/a (0) None (0) All types of wet veg with no masks s1t1v0n0 --> Fresh (1) Flowing (1) All (0) Brackish standing water & brackish wet veg (0) Fresh, flowing water with brackish standing water and wet veg masked out s1t1v0n1 --> Fresh (1) Flowing (1) All (0) All standing water & brackish wet veg (1) Fresh, flowing water with all standing water , and brackish wet veg masked out s1t1v1n1 --> Fresh (1) Flowing (1) Fast Only (1) Slow & standing (1) Fresh, fast flowing water with slow water & standing water masked out s1t1v2n0 --> Fresh (1) Flowing (1) Slow Only (2) Fast (0) Fresh, slow flowing water with fast water masked out s1t1v2n1 --> Fresh (1) Flowing (1) Slow Only (2) Fast & standing (1) Fresh, slow flowing water with fast water & standing water masked out s1t2v0n0 --> Fresh (1) Standing (2) n/a (0) Brackish flowing water & brackish wet veg (0) Fresh, standing water with brackish flowing water and wet veg masked out s1t2v0n1 --> Fresh (1) Standing (2) n/a (0) All flowing water & brackish wet veg (1) Fresh, standing water with all flowing water and wet veg masked out s1t3v0n0 --> Fresh (1) Wet Veg (3) n/a (0) Brackish (0) Fresh wet veg with brackish water masked out s2t1v0n0 --> Brackish (2) Flowing (1) All (0) Fresh standing & fresh wet veg (0) Brackish flowing water with fresh standing water, & fresh wet veg masked out s2t1v0n1 --> Brackish (2) Flowing (1) All (0) All standing water & fresh wet veg (1) Brackish flowing water with all standing water and fresh wet veg masked out s2t2v0n0 --> Brackish (2) Standing (2) n/a (0) Fresh flowing & fresh wet veg (0) Brackish standing water with fresh flowing water & fresh wet veg masked out s2t2v0n1 --> Brackish (2) Standing (2) n/a (0) All flowing water & fresh wet veg (1) Brackish standing water with all flowing water & fresh wet veg masked out s2t3v0n0 --> Brackish (2) Wet Veg (3) n/a (0) Fresh standing, flowing, & wet veg (0) Brackish wet veg with fresh flowing, standing water, & wet veg masked out. This hydrography data set is considered official foundational data for the GAP species modeling process. The data have been made available provisionally to enhance understanding and use of GAP species data.
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.
