10.1594/PANGAEA.995225Bühler, LinnuLinnuBühlerUniversity of CologneRückert, Janna ElisabethJanna ElisabethRückert0000-0001-9885-6576Institute of Environmental Physics, University of BremenWalbröl, AndreasAndreasWalbröl0000-0003-2603-2724University of CologneKrobot, PavelPavelKrobotUniversity of ColognePANGAEA2026ArcticArctic OceanCamera observationsRGBSea iceDATE/TIMEImageImage (File Size)Digital Camera, GoProPS149PolarsternArctic Amplification (AC3)2025-07-03T11:00:00/2025-08-28T13:00:00Dataset10.1594/PANGAEA.99049710.1594/PANGAEA.9871322503 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalDuring the Polarstern cruise PS149 from July 2025 to September 2025 in the Arctic Ocean, photos of the surface (open ocean and sea ice) were recorded from onboard the vessel with a down-looking camera (GoPro Hero 11 Black) that was installed on port side on the A-deck (at around 20 m above sea level). The viewing angle (off-nadir) was around 53°. Each image has a size of 1114 x 974 pixels. The camera was operated with a sampling rate of 0.5 Hz, taking a picture every 2 s. The visual camera was operated in conjunction with an infrared camera, pointing at the same target, in addition microwave radiometers measured the surface brightness temperatures of a small area within the camera image (these datasets are also part of the VAMPIRE-2 dataset bibliography https://doi.org/10.1594/PANGAEA.990497).
The images are downscaled to reduce storage needs and stored as zipped JPG files where one zip file includes one image per minute from one hour. In addition, the images are projected to the ground (top view projection). For that, the ship railing visible in the lower right of each image is masked out, except for a 40 by 40 pixel area showing the white ship hull. This area may be taken as white reference (calibration target) by users who want to use, for example, calibrated brightness information. The projection to the ground uses the roll and tilt angles obtained from the hydrins measurements (available via dship at 1 Hz resolution) and the python package cameratransform with the following parameters: sensor size 6.47mm x 5.05mm and focallength_mm 3.8 mm. Finally the images are cropped to contain a smaller area in the center of the original image. These post-processed images are available in the original temporal resolution. Data is available starting 3 July, 11:06, until 28 August, 13:44. More than 1 hour of data is missing from 2025-07-03 15:17:26 to 2025-07-04 17:42:43, and from 2025-07-14 09:02:58 to 2025-07-15 08:43:10.-10.08540214.92344378.2551181.889001Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhavenhttps://doi.org/10.13039/501100003207AWI_PS149_07VAMPIRE-2German Research Foundationhttps://doi.org/10.13039/501100001659268020496TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms