Cost-weighted distance modeling.

<p>(A) Example 3 km×3 km landscape with a pixel size of 3 m (from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0052604#pone.0052604-McRae1" target="_blank">[15]</a>). Two habitat patches (green) are embedded in a matrix of land cover types with differing resistance to movement. Resistances range from 1 (white) to 100 (dark grey); complete barriers with infinite resistance (e.g., linear features representing roads and highways) are shown in black. (B) Cost-weighted distance (<i>CWD</i>) from leftmost patch, with darker shades representing higher cumulative resistance from the patch. (C) <i>CWD</i> from rightmost patch, with darker shades representing higher cumulative resistance from the patch. (D) Modeled least-cost corridor produced by adding <i>CWD</i> surfaces shown in panels B and C (best 20% of study area shown). The least-costly path (traced in green) has a cumulative least-cost distance (<i>LCD</i>) of 124,443 weighted meters.