Above-water hyperspectral field spectroscopy and associated water quality measurements in the Sacramento-San Joaquin Delta, California, collected in 2024 and 2025

Broad-area, high-resolution, boat-based water quality mapping surveys of the Sacramento-San Joaquin Delta (Delta) were conducted in June and September of 2024. Each survey was comprised of one day of high-resolution mapping. The regions covered included Discovery Bay and Old and Middle Rivers in the South Delta Tidal Transition Zone. On each day, the route of the mapping survey was determined by weather, tides and other logistical considerations. Please note that this dataset will be revised in the future. Additional data is being collected in 2025, and the final dataset will include the high-resolution water quality data mentioned above, as well as water quality data collected with a vertical profiler, field-based hyperspectral data collected with a handheld spectroradiometer, and water quality data for discrete samples.