Can 100m soil moisture from Sentinel-1 unlock early-season irrigation detection?
In this paper, Sofia Rossi, a Phd student within SARWATER, has recently published a paper on irrigation detection over the Riaza irrigation district (Spain). The study shows that high-resolution (~100 m) soil moisture maps from Sentinel-1 and Sentinel-2 can detect field-scale irrigation early in the growing season, although accuracy depends on satellite timing, crop stage, and the delay between irrigation and observation. Results also indicate a strong relationship between soil moisture and irrigation depth, supporting the estimation of applied water volumes. Additionally, combining C-band and L-band SAR data can enhance irrigation monitoring over the entire crop cycle.