Neckel, Niklas; Fuchs, Niels; Birnbaum, Gerit; Hutter, Nils; Jutila, Arttu; Buth, Lena; von Albedyll, Luisa; Ricker, Robert; Haas, Christian (2023): Helicopter-borne RGB orthomosaics and photogrammetric Digital Elevation Models from the MOSAiC Expedition [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.949433
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Abstract:
The Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition took place between October 2019 and September 2020 giving the rare opportunity to monitor sea-ice properties over a full annual cycle. Here we present 24 high-resolution orthomosaics and 14 photogrammetric digital elevation models of the sea-ice surface around the icebreaker RV Polarstern between March and September 2020. The dataset is based on >34.000 images acquired by a helicopter-borne optical camera system with survey flights covering areas between 1.8 and 96.5 km^2 around the vessel. Depending on the flight pattern and altitude of the helicopter, ground resolutions of the orthomosaics range between 0.03 and 0.5 m. By combining the photogrammetric products with contemporaneously acquired airborne laser scanner reflectance measurements selected orthomosaics could be corrected for cloud shadows which facilitates their usage for sea-ice and melt pond classification algorithms. The presented dataset is a valuable data source for the interdisciplinary MOSAiC community building a temporal and spatially resolved baseline to accompany various remote sensing and in situ research projects.
Central Observatory (CO) grid flights are available as single grids while transect and triangle flights were segmented into 2 km x 2 km data tiles to provide the user with manageable file sizes. Next to the orthomosaic and DEM data we provide confidence maps of the respective survey flights. All data is stored in GeoTIFF file format and gridded to 0.5 m spatial resolution. For the CO grid flights we also provide orthomosaic data at full spatial resolution within a 3 km square centered at Polarstern. The naming convention of the final data products is: Date, #Flight, DShip ID, followed by DEM, confidence or orthomosaic, and hr for high resolution (0.5 m) or fr for full resolution. As we provide brightness corrected orthomosaics these are termed l2 for level 2 products and if the data were corrected for the effect of cloud shadows we added a l2b product. All datasets were projected to a polar stereographic reference system centered at 45° W and vertically referenced to the Global Mean Sea Surface grid provided by DTU Space. The final datasets are stored in one zip archive per survey flight.
Project(s):
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AFMOSAiC-1_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS122_00: Multidisciplinary drifting Observatory for the Study of Arctic Climate / MOSAiC
Coverage:
Median Latitude: 83.801733 * Median Longitude: 22.248499 * South-bound Latitude: 78.355862 * West-bound Longitude: -35.606555 * North-bound Latitude: 89.140237 * East-bound Longitude: 112.955967
Date/Time Start: 2020-03-18T10:45:00 * Date/Time End: 2020-09-21T07:46:00
Minimum Elevation: -4374.0 m * Maximum Elevation: -228.0 m
Event(s):
PS122/3_32-42 * Latitude Start: 86.694629 * Longitude Start: 12.137035 * Latitude End: 86.703498 * Longitude End: 11.992191 * Date/Time Start: 2020-03-18T10:45:00 * Date/Time End: 2020-03-18T10:56:37 * Elevation: -4374.0 m * Sensor URI: sensor.awi.de * Location: Arctic Ocean * Campaign: PS122/3 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Helicopter (HELI) * Comment: Survey aborted due to crack in LOG area
PS122/3_32-70 (20200321_01) * Latitude Start: 86.262759 * Longitude Start: 15.163634 * Latitude End: 86.225523 * Longitude End: 15.566116 * Date/Time Start: 2020-03-21T08:08:00 * Date/Time End: 2020-03-21T10:08:50 * Elevation: -3767.0 m * Sensor URI: sensor.awi.de * Location: Arctic Ocean * Campaign: PS122/3 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Helicopter (HELI) * Comment: floe grid
PS122/3_33-17 * Latitude Start: 86.212133 * Longitude Start: 15.812490 * Latitude End: 86.286338 * Longitude End: 15.510762 * Date/Time Start: 2020-03-23T10:37:00 * Date/Time End: 2020-03-23T12:17:00 * Elevation: -2709.3 m * Sensor URI: sensor.awi.de * Location: Arctic Ocean * Campaign: PS122/3 (MOSAiC20192020) * Basis: Polarstern * Method/Device: Helicopter (HELI) * Comment: chasing ICESat-2 orbit
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Neckel, Niklas | |||
| 2 | Binary Object | Binary | Neckel, Niklas | |||
| 3 | Binary Object (File Size) | Binary (Size) | Bytes | Neckel, Niklas |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Basic curation (CurationLevelB) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
24 data points