In-situ Sonde-Based Phycocyanin measurements of the Contiguous United States matched with Coincident Sentinel-2 MSI Level-2A Data (2015-2024)

The data provided are same-day matchups between in-situ, sonde-based phycocyanin measurements collected across the contiguous United States (CONUS) and Sentinel-2 Level-2A MSI data from 2015 to 2024. The in-situ data are composed of EXO sonde-based phycocyanin measurements, with other optically active water quality constituents included where available. These data are designed for testing and training machine learning models to create and validate remotely sensed estimates of aquatic phycocyanin concentrations. In-situ observations include data from continuous monitoring stations, discrete sampling events, and boat surveys. Continuous monitoring data include the average, standard deviation, minimum, maximum, and observation count of associated water quality parameters collected between 10:00am and 12:00pm local time to align with Sentinel-2 overpass times.

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