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Remote sensing for soil map unit boundary detection

26 Creating accurate soil maps at small scales using traditional methods is a time-consuming 27 and expensive process. However, remote-sensing techniques can provide spatially and spectrally 28 contiguous data in a timely manner. For this study, 20 root zone soil moisture maps derived from 29 Landsat images during the growing season were used for the detection of soil boundaries. A split 30 moving-window analysis along two demonstration transects in, respectively, a semi-arid desert 31 and riparian area located in the Middle Rio Grande Valley of New Mexico showed that remotely 32 sensed root zone soil moisture can reveal subsurface trends that can be used to identify soil 33 boundaries that do not have a strong surface expression. Overall, the use of multiple remotely 34 sensed root zone soil moisture and Landsat images for soil boundary delineation shows great 35 promise of becoming a valuable tool in the field of digital soil mapping. 36