Detection of anomalous crop condition and soil variability mapping using a 26 year Landsat record and the Palmer crop moisture index

•Define normal crop condition based on 26 years of Landsat data.•Crop condition assessed through NDVI, soil moisture from crop moisture index (CCMI).•Responses in depressions were anti-correlated, and crests correlated, with CCMI.•Normal condition was defined by a tolerance interval from the sample distribution.•Broader application for crop condition monitoring and edaphological soil mapping.