The files linked to this reference are the geospatial data created as part of the completion of the baseline vegetation inventory project for the NPS park unit. Current format is ArcGIS file geodatabase but older formats may exist as shapefiles.

Cogan Technology, Inc. (CTI) created the digital vegetation map layer for the Mojave National Preserve and Castle Mountains National Monument project, which covered over 1.6 million acres (640,000 ha). In the accuracy assessment (AA) phase, contracted field crews collected data at 720 AA point locations that were randomly placed by map class throughout the project area. In the final phase, CTI finalized the classification, reported the AA results, revised the final vegetation map, and delivered the final products to the NPS VMI. The resulting spatial database and vegetation map layer were created using a combination of 2018 National Agriculture Imagery Program (NAIP) basemap data, ground-based verification efforts, and a two-step or hybrid mapping approach that used both manual and automated techniques. By comparing the vegetation signatures on the imagery to the field data, 87 map units (72 vegetated and 15 land-use/land-cover) were developed and used to delineate the plant communities. The interpreted vegetation polygons were then digitized into a Geographic Information System (GIS) layer that was field-tested, reviewed, and revised. The final MOJA and CAMO vegetation map layer was assessed for overall thematic accuracy at 91% with a Kappa value of 92%.