Hyperspectral Remote-sensing reflectance data collected by the Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) within the Connectivity and synchronisation of lake ecosystems in space and time (CONNECT project). This data set is limited to records for one field sampling campaign in 26.07.2019. Field data collection and processing: Ogashawara, I.; Kiel, C.; Jechow, A.; Kohnert, K.; Ruhtz, T.; Grossart, H.-P.; Hölker, F.; Nejstgaard, J.C.; Berger, S.A.; Wollrab, S. The Use of Sentinel-2 for Chlorophyll-a Spatial Dynamics Assessment: A Comparative Study on Different Lakes in Northern Germany. Remote Sensing, v. 13, 1542, 2021. doi:10.3390/rs13081542 Data specification Station name – name of the station lat, lon - geographical latitude/longitude coordinates in decimal degrees chl-a - chlorophyll-a concentration in μg/L Rrs 380… Rrs 779 - Remote-sensing reflectance (Rrs, units 1/sr). The sequential numbering (380 - 779) denotes the wavelength in nm.