Species download free

Therefore, we developed three general categories to include in species habitat models for species requiring water. Stream velocity : For some aquatic species, this is an important aspect of their habitat, such as oxygenation levels, presence of invertebrate prey, and amount of sediment within the water column and on streambed substrates.

Stream velocity i. Typically these are areas where the underlying topography is steep. Map units are designated as either primary or secondary. Secondary map units are selected only when located within a specified distance from primary map units. Patch Size : The type and size of clusters of habitat can be assessed with spatial modeling.

We used patch size to indicate minimum amounts of contiguous habitat needed for a species. This variable requires the generation of cluster sizes in the actual modeling code during post processing. In other words, these model variables are not independent ancillary data layers.

There are no specific ancillary layers for this variable. For example, an ecotone width of meters includes meters into forest and meters into open. Buffer distances: --Distances into ecotone e. See above under Forest and Ecotone Habitats for descriptions of the forest and non-forest map units. For a species that requires interior forest e.

Skip to main content. Search Search. Gap Analysis Project. Species Data Download. Modeling Regions : The lower 48 states of the U. Each of the ancillary data layers are split into these six regions and models were run within a region and regional model output were compiled to create a complete distribution model across a species range.

The regions are based on grouped MRLC zones. Download the national boundaries data. Download the regional boundaries data. Human Impact Avoidance : Regional layers indicating how intolerant a species is to human disturbance. Download human impact avoidance data. Download elevation data file. Download land cover data file. Download forest edge data. Download forest and ecotone habitats data. Download hydrography data. File size: 5 GB.

Part 2: Hydrography Click here to download. File size: 16 GB. Slope: Nationwide coverage of slope, which represents the percent of change of elevation for each 30 m cell. It is based on DEM data. Download slope data file. Aspect: Nationwide coverage of aspect, which describes the direction of slope in degrees. Phone Number. Job Title. Company Size Company Size: 1 - 25 26 - 99 - - 1, - 4, 5, - 9, 10, - 19, 20, or More.

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