Terra Nova Bay Polynya boundary displacement - high temporal resolution dataset based on satellite data, 2012-2024

The data are organized as follows: Each folder named “YYYY-mm-DD.zip” contains all data related to a given event.Within each ZIP archive, you will find 3 subfolders and file with meteorological statistics. SUBFOLDERS: 1. ‚shapefiles’: One or more .shp files containing georeferenced series of polynya boundary lines (PBLs). Each line has a unique ID corresponding to its sequence in the dataset, i.e., to consecutive satellite images. The numbering is not always continuous, as some satellite scenes were excluded (e.g., due to clouds or poor image quality), resulting in missing ID values in the sequence. For a given event, there may be one shapefile or several, depending on the number of individual polynya boundaries detected. 2. ‚date_overviewtif’: set of .tiff files that illustrate the satellite image, cut to Terra Nova Bay region. 3. ‚displacement’: Four .csv files for each polynya boundary line series, named as: date_lineX_shift1, date_lineX_shift1c, date_lineX_shift2, and date_lineX_shift2c. Each file contains a specific type of displacement data, described below: a) 'YYYY_MM_DD_lineX_shift1' – calculated using the Laplace-equation-based method, all calculations refer to the values between two consecutive PBLs. COLUMNS: t1 - start datetime; t2 - datetime of the consecutive image; area - area of the polygon; len - length of the 0.5 solution line; wmean - mean distance; dt - time difference; vel - average velocity of the PBL. b) 'YYYY_MM_DD_lineX_shift1c' - calculated using the Laplace-equation-based method, all calculations refer to the values between coast and given PBL. COLUMNS: area - area of the polygon; len - length of the 0.5 solution line; wmean - mean distance; t - datetime of the given PBL. c)'YYYY_MM_DD_lineX_shift2' - calculated using the point-to-point method, all calculations refer to the values between two consecutive PBLs. COLUMNS: wmean - mean distance; wmin - minimum distance; wmax - maximum distance; area - area of the polygon; t1 - start datetime; t2 - datetime of the consecutive image; dt - time difference; vel - average velocity of the PBL; negshift (%) - percent of the line length where displacement is negative (i.e., movement toward the coast). d) 'YYYY_MM_DD_lineX_shift2c' - calculated using the point-to-point method, all calculations refer to the values between coast and given PBL. COLUMNS: wmean - mean distance; wmin - minimum distance; wmax - maximum distance; area - area of the polygon; t - datetime of the given PBL; negshift (%) - percent of the line length where displacement is negative (i.e., movement toward the coast); All datetime variables are given in a format: 'dd-mmm-yyyy HH:MM:SS', area is given in (m^2), length and distance are given in (m), velocity is given in (m/s), time difference is given in (s). 4. meteo_statistics – contains meteorological data averaged over periods between consecutive satellite images, COLUMNS: File Number; Start_Time - datetime in the format 'DD-MM-YYYY HH:MM:SS'; End_Time - datetime in the same format as above; Temp_Avg - average air temperature; Temp_Min - minimum air temperature; Temp_Max - maximum air temperature; Pressure_Avg - average air pressure; Pressure_Min - minimum air pressure; Pressure_Max - maximum air pressure; WindSpeed_Avg - average wind speed; WindSpeed_Min - minimum wind speed; WindSpeed_Max - maximum wind speed; WindDir_Avg - average wind direction; WindDir_Min - minimal wind direction; WindDir_Max - maximal wind direction; Humidity_Avg - average air humidity; Humidity_Min - minimum air humidity; Humidity_Max - maximum air humidity. All variables are given in the following dimensions: temperature (°C), pressure (hPa), wind speed (m/s), wind direction (°), humidity (%). All coordinates are given in the EPSG:32758 – WGS 84 / UTM zone 58S projection.Time is expressed in UTC.