Ocean color retrieval using DroneSpex: a miniature imaging spectrometer

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DroneSpex, a miniature hyperspectral imager, has been tested for ocean color measurements and retrieval of chlorophyll concentration. The work was carried out at Norut AS, Tromsø, Norway and calibration of the spec- trometer was made at The University Centre in Svalbard (UNIS), Norway Field data were collected during the spring bloom of phytoplankton in Sk- agerrak 2007, where the instrument was mounted on a passenger ferry. Reflectance measurements and chlorophyll estimates were validated against measurements made by the Norwegian Institute for Water Research, NIVA. The DroneSpex reflectance measurements agree well with the validation data, but has low or no correlation with the NIVA chlorophyll estimates. A chlorophyll concentration retrieval algorithm adapted to oceanic waters was used, while the water in Skagerrak is of coastal type. It is a well knownfact that algorithms for oceanic waters break down in more optically complex coastal waters, where dissolved organic substances and suspended materials other than phytoplankton have a significant influence on the reflectance spectrum. The re...