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Sign In Sign in to add your own tags to this product. All rights reserved. All trademarks are property of their respective owners in the US and other countries. However, the dynamic and complex nature of water systems makes the development of a highly refined and reliable data layer challenging. 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.