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Model Datasets

Below are the datasets and model attributes used in the SWReGAP Habitat Modeling effort. Models did not always use all available datasets.  The most common attributes used were land cover and elevation with the hydrologic units as the constraining layer.

Description Dataset Examples
(pdf)
Notes Metadata

Download Data
(large files)

Land Cover SWReGAP Derived Landcover See landcover page The vegetation map created for SWReGAP.  This layer consists of 125 land cover types including natural and disturbed classes. metadata SWlandcover
Elevation NED DEM This is the Digital Elevation Model (DEM) for the region. metadata regional_dem
Slope NED Derived slope Derived from regional dem. Value is (integer) slope in degrees. metadata slope
Aspect NED Derived aspect Derived from regional DEM. (integer) Aspect (in degrees) is value and reclassed to SWReGAP categories is in value attribute table. metadata aspect
Distance to Perennial Water NHD Derived intlakes
Intstream

perennial lakes
perennial stream

springs
wetlands

Each type of water is selected from the USGS NHD and a grid is created where each pixel is defined as the (integer) euclidean distance (in meters) to nearest water type.  Pixels are selected if they are less than the specified distance.   

This layer can be used as a riparian surrogate. 

metadata
metadata

metadata
metadata

metadata
metadata

disttointerstill
disttointerflow

disttolake
disttoperrflow

disttosprings
disttowetlands

Landform NED Derived landform This dataset is a 10-class land form dataset that divides the region into areas based on slope and aspect. 
  1. Valley Flats floodplains, basin floors, (alluvial, lacustrine)
  2. Toe Slopes, bottoms and swales riparian and semi-riparian, moist lower slopes and bottoms (fluvial/alluvial, colluvial, glacial)
  3. Gently sloping ridges,fans, and hills ridges and moderately dry hills and moraines (residual, glacial, other)
  4. Nearly level plateaus and terraces upland or terrace flats (residual, alluvial)
  5. Very moist steep slopes lower north facing valley and mountain
    sideslopes
  6. Moderately moist steep slopes northerly facing valley and mountain sideslopes
  7. Moderately dry steep slopes southerly facing valley and mountain sideslopes
  8. Very dry steep slopes upper southwest facing valley and mountain
    sideslopes
  9. Cool aspects cliffs, scarps, cirques over-steepened, northerly slopes
  10. Hot aspects cliffs, scarps, cirques. over-steepened, southerly slopes
metadata landform
Soils STATSGO Derived

clay
silt
sand
loam

boulders
stone
gravel
cobble
rocky

soil depth
shallow
deep soils
pan

outcrop 15
outcrop 15-30
outcrop 30-65
outcrop 65

Derived from STATSGO. Each MUID (statsgo polygon ID) was reclassed to SWRegap soil attributes.  Attribute table of coverage swregapstatsgo has the reclassification.

 
metadata swregapstatsgo
Hydrologic Units     8-digit hydrologic units metadata usgshuc
Mountain Ranges   Mountain Mountain range coverage created by using a roughness coefficient of the DEM.  metadata gapmtn
Precipitation   Not Used This dataset is generally considered to be too coarse for modeling and was not used.     
Temperature   Not Used This dataset is generally considered to be too coarse for modeling and was not used.     
           

For additional comments or questions contact
Ken Boykin

575.646.6303