The study area was in southeastern Arizona's Basin and Range physiographic province. Parent materials were primarily sedimentary basin fill deposits, including dissected and inset alluvial fans and fan terraces ranging in age from Holocene (12 Ka) to early Miocene-aged (20 Ma).
We developed a soil pre-mapping technique using automated image segmentation that utilized soil-landscape relationships and surface reflectance to produce an effective map unit design in a 160,000 ha soil survey area. Overall classification accuracy of soil taxonomic units at the suborder was 58 % after including soil temperature regime. Physical soil properties were not significantly different for individual transects; however, properties were significantly different between soil pre-map units when soils from the entire study area were compared.