Olenin, Sergej

Dataset presents visual data of bottom macrofauna filmed in sublittoral of European Arctic – Svalbard. Some of the areas (Burgerbukta, Borebukta, Dahlbrebukta, St. Johnsfjorden, Trygghamna) are in the vicinity of melting glaciers, others are in ice-free areas (Adriabukta, Eidembukta, Gipsvika). The dataset consists of three types of data: video samples, 2D mosaics and annotations of objects found. In total, 22 min 51 s of video footage was collected and split into 10-30 s segments, resulting in 47 video samples. he labels of samples indicate site, transect, a part of raw video from which video sample was cropped and duration of video sample. E.g., file named B1_0332_30s.bmp, where B stands for Borebukta bay (AD – Adriabukta, B – Borebukta, D - Dahlbrebukta, E - Eidembukta, G - Gipsvika, HB - Burgerbukta, SJ - St. Johnsfjorden, T - Trygghamna), 1 – transect number, 0332 – 3 min 32 s start time from a raw video, 30s – length of video sample from which this mosaic file was made. All video samples were converted into still images (video mosaics), that were manually analysed by marine biologists - specialists in Arctic biota, who identified visible biological objects at the lowest possible taxonomic level. Twelve taxons were targeted for annotation: brown alga – kelp Laminaria, spider crab Hyas sp., brittlestars Ophiuroidea, burrowing anemone Halcampa sp., sea squirts Tunicata, tube anemone Ceriantharia sp., sea star Urasterias lincki, tube dwelling Polychaeta, snailfishes Liparidae, flatfishes Pleuronectiformes, Shrimps, and benthic trachymedusa Ptychogastria polaris. Annotation process, where 4 experts performed manual pixel-wise segmentation (with Labelbox tool) and mask refinement survey (on SurveyJS platform), resulted in 2242 annotated objects with the most popular category – Ophiuroidea.

Dataset consists of three directories: video samples (3-5 fps, .AVI format), video mosaics (.JPG format) and annotated categories with/without background (.PNG format). 47 video samples and 47 resulting 2D mosaics with corresponding annotations (masks and mask overlays) for 2242 objects in 12 categories.

Geographic information. The following bays of Svalbard archipelago: Adriabukta (77.000100, 16.192216), Burgerbukta (77.057108, 16.007882), Borebukta (78.38859, 14.28120), Dahlbrebukta (78.566666, 12.368533), Eidembukta (78.360133, 12.779950), Gipsvika (78.42591, 16.52873), St. Johnsfjord (78.506766, 12.931066), Trygghamna (78.254050, 13.761500) .

Dataset presents bathymetrical and hydrological data from newly formed lagoon between Eidembreen glacier and Eidembukta bay in Svalbard, European Arctic. Surveys were conducted in 2022 August 21-26th, 2023 August 14-19th and 2024 July 22-24th. The dataset consists of bathymetry data and hydrological data. Bathymetry data was collected using Garmin Echomap UHD 92sv sonar with GT56UHD-TM transducer, additionally, in 2022 shallow depths were measured with a sonar Deeper chirp+2. Hydrological data was collected using Valeport SWiFT SVP probe in 2022 and 2024, while in 2023 a multiparameter probe CTD115M was used. Bathymetrical data files consist of coordinates (longitude, latitude in WGS 1984 coordinate system) and depth measurements (in meters). Hydrological data from 2022 and 2024 consists of several parameters: depth profile (m), pressure (decibars), sound velocity (m s-1), temperature (degree Celsius), salinity (PSU), density (kg m-3), conductivity (milliSiemens per centimeter), date and time. Hydrological data from 2023 consists of following parameters: pressure (decibars), temperature (degree Celsius), conductivity (milliSiemens per centimeter), oxygen saturation (%), dissolved oxygen concentration (mg l-1), pH, photosynthetically active radiation (microeinsteins), turbidity (FTU), salinity (PSU), density (kg m-3), sound velocity (m s-1). The dataset consists of two directories: 1) “Bathymetry”, which includes files “depths_Deeper2022”, “depths_Garmin2022”, “depths_Garmin2023”, “depths_Garmin2024”, with indication to sonar used and the year of survey; 2) “Hydrology”, which contains three subfolders “2022”, “2023” and “2024” indicating the year of survey. Each subfolder consists of files with coordinates (contains site names, longitude and latitude in WGS 1984 coordinate system) and hydrological data (contains hydrological data for each site in separate sheet). Data is provided both in .xlsx and .csv formats. Geographic information. Edge coordinates of the Eidembukta Lagoon are: Northernmost point 78°24’19,1’’N / 12°50’33,7’’E, Easternmost point 78°22’10,4’’N / 12°55’44,8’’E, Southernmost point 78°21’13,1’’N / 12°52’34,4’’E, Westernmost point 78°22’30,8’’N / 12°45’26,8’’E.