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Over the past decade, great progress has been made to develop national extent land cover mapping products to addressnatural resource issues. One of the core products of the GAP Program is range-wide species distribution models for nearly2000 terrestrial vertebrate species in the U.S. We rely on deductive modeling of habitat affinities using these products tocreate models of habitat availability. That approach requires that we have a thematically rich and ecologically meaningfulmap legend to support the modeling effort. In this work, we tested the integration of the Multi-Resolution LandscapeCharacterization Consortium's National Land Cover Database 2011 and LANDFIRE's Disturbance Products to update the2001 National GAP Vegetation Dataset to reflect 2011 conditions. The revised product can then be used to update thespecies models. We tested the update approach in three geographic areas (Northeast, Southeast, and Interior Northwest). We used the NLCDproduct to identify areas where the cover type mapped in 2011 was different from what was in the 2001 land cover map. Weused Google Earth and ArcGIS base maps as reference imagery in order to label areas identified as "changed" to theappropriate class from our map legend. Areas mapped as urban or water in the 2011 NLCD map that were mappeddifferently in the 2001 GAP map were accepted without further validation and recoded to the corresponding GAP class. Weused LANDFIRE's Disturbance products to identify changes that are the result of recent disturbance and to inform thereassignment of areas to their updated thematic label. We ran species habitat models for three species including Lewis'sWoodpecker (Melanerpes lewis) and the White-tailed Jack Rabbit (Lepus townsendii) and Brown Headed nuthatch (Sittapusilla). For each of three vertebrate species we found important differences in the amount and location of suitable habitatbetween the 2001 and 2011 habitat maps. Specifically, Brown headed nuthatch habitat in 2011 was −14% of the 2001modeled habitat, whereas Lewis's Woodpecker increased by 4%. The white-tailed jack rabbit (Lepus townsendii) had a netchange of −1% (11% decline, 10% gain). For that species we found the updates related to opening of forest due to burningand regenerating shrubs following harvest to be the locally important main transitions. In the Southeast updates related totimber management and urbanization are locally important

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Integrating Recent Land Cover Mapping Efforts to Update the National Gap Analysis Program's Species Habitat Map