Author:  Jeff Jenness

Wildlife Biologist, GIS Analyst

Jenness Enterprises

3020 N. Schevene Blvd.

Flagstaff, AZ, 86004   USA

(928) 607-4638

[email protected] 

Land Facet Corridor Designer is a geographic approach to designing wildlife linkages that will be useful in the face of impending climate change. This novel GIS-based procedure identifies the geographic portion of a region that maximizes continuity and diversity of landscape units defined by topographic and soil traits (such as high-elevation north-facing slopes with rocky soils, or low-elevation flats with thick soils) that are expected to facilitate wildlife movement. We refer to these topographic-soil units as land facets. The rationale is that future vegetation (and, indirectly, animal assemblages) and human land uses will be determined primarily by the interaction among land facets (soil and topography) and future climate regimes. The conceptual basis for this approach was recently published (Beier, P., and B. Brost. 2010. Use of land facets to plan for climate change: conserving the arenas, not the actors. Conservation Biology. DOI: 10.1111/j.1523-1739.2009.01422.x).

Land Facet Corridor Designer is explained in detail, and applied to three landscapes in Arizona, by Brost (2010, MS Thesis, School of Forestry, Northern Arizona University; available online). Publications from this thesis, with Brian Brost as senior author, should appear in the peer-reviewed literature in 2011.

Until now, practitioners designed corridors to promote movement of focal species through today’s land cover map. Because land cover maps are likely to change in this century, any corridor linkage based on those maps might fail during climate change. By conserving strands of land facets, linkage designs based on our new procedures should preserve the “arenas” that support current and future biodiversity, without relying on the modeled responses of the temporary occupants of those arenas.

Conservation practitioners now have a flexible tool to design and map corridors of land facets at high resolution (30-m or 10-m, depending on resolution of the DEM) that have a high probability of allowing for animal movement, including shifts of species’ geographic ranges, during and after climate change. This can enhance the ability to design wildland networks robust to climate change, reducing the impact of climate change on the biota of natural landscapes. These procedures are transparent and do not depend on global or regional circulation models.

The Tools:  This extension is intended as a companion to CorridorDesigner available at http://www.corridordesign.org, and we recommend that you also download and install those tools. The tools in this Land Facet extension will work fine without CorridorDesigner, but some of the general tasks (such as creating corridor polygons over a habitat suitability raster, or creating patch polygons) require functions from CorridorDesigner. The tools in Land Facet Corridor Designer provide an alternative way to create the “habitat suitability” raster (i.e. the cost surface), but using land facets rather than focal species. Once you have created that cost surface raster, then you can use the standard CorridorDesigner tools to create the corridor polygons.

This extension is also designed to work in conjunction with a set of Land Facet R tools, available near the bottom of the page at http://www.corridordesign.org/downloads.  This ArcGIS extension does not use any R functions directly and therefore will work just fine without R installed.  However, the Land Facet cluster function is entirely performed in R.  This extension provides tools to export data in a format suitable for analysis in R, and it also includes tools to import the data that R generates.  All other analyses and tools, including the Density Surface, Shannon's Diversity Index, Termini Polygons, Raster Inversion, TPI Tools, and Mahalanobis Distance Tools are performed entirely by ArcGIS and do not require R.

Recommended Citation Format: For those who wish to cite this extension, the author recommends something similar to:

Jenness, J., B. Brost and P. Beier.  2013.  Land Facet Corridor Designer: Extension for ArcGIS. Jenness Enterprises. Available at: http://www.jennessent.com/arcgis/land_facets.htm

Current Citation List (from Google Scholar):

Requires:  ArcGIS 9.1 or better (at any license level) or ArcGIS 10.