Ringel, Maximilian Harald; Spreen, Gunnar; Huntemann, Marcus (2026): Hyperspectral camera raw data (SPECIM_IQ_01) during the RV Polarstern PS149 CONTRASTS cruise (July-August 2025) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.995759
Always quote citation above when using data! You can download the citation in several formats below.
Published: 2026-07-10 • DOI registered: 2026-08-08
Abstract:
The data consists of 146 hyperspectral images 512x512 pixels in 204 bands in the wavengths range between 400 – 1000 nm with 2.5 nm step, obtained with the SPECIM IQ hyperspectral camera. The images contain bare ice, snow and melt pond surfaces and are taken with an incidence angle of about 40-50°. See the referenced cruise report for details of the used measurement set-up. The images have been either taken along straight transects along measurement tapes in regular distances of 20 meters or at specific locations at which other co-located measurements have been conducted. For the latter ones the images have been taken with an incidence angles of 0° and labeled with _coord in their location names. The data are raw data in the original SPECIM IQ format. Each data record is a folder (compressed as one file) readable by the Specim IQ software, which is downloadable free of charge from the manufacturer (Specim) after registration. Within the field of view of each scene, there is a white reference plate, which can be used for image calibration to obtain the hemispheric-directional surface reflectances. Out-of-focus white reference still can be used for calibration as the spectral properties are not affected.
We provide some additional parameters to each image if available. Further hyperspectral images taken during the PS149 CONTRASTS expedition, which only cover melt pond surfaces using a 0° incidence angle, are available in a seperate dataset.
Keyword(s):
Related to:
Bühler, Linnu; Rückert, Janna Elisabeth; Walbröl, Andreas; Mech, Mario; Krobot, Pavel; Ebell, Kerstin; Schnitt, Sabrina; Spreen, Gunnar (2026): Water vapor, mixed-phase clouds, precipitation and sea ice emissivity over the Central Arctic Ocean (VAMPIRE-2): remote sensing and in-situ measurements suite during POLARSTERN cruise PS149 (CONTRASTS) [dataset bibliography]. PANGAEA, https://doi.org/10.1594/PANGAEA.990497
Nicolaus, Marcel (2026): The Expedition PS149 of the Research Vessel POLARSTERN to the Arctic Ocean in 2025. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 808, 382 pp, https://doi.org/10.57738/BZPM_0808_2026
Ringel, Maximilian Harald; Spreen, Gunnar; Huntemann, Marcus (2026): Hyperspectral camera raw data (SPECIM_IQ_01) of nadir melt pond images taken during the RV Polarstern PS149 CONTRASTS cruise (July-August 2025) [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995758 (similar dataset for nadir melt pond images)
Project(s):
Arctic Amplification (AC3)
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS149_01: Sea Ice Physics (CONTRASTS)
German Research Foundation (DFG), grant/award no. 268020496: TRR 172: ArctiC Amplification: Climate Relevant Atmospheric and SurfaCe Processes, and Feedback Mechanisms
Coverage:
Median Latitude: 83.669937 * Median Longitude: 10.555166 * South-bound Latitude: 82.430301 * West-bound Longitude: -17.885840 * North-bound Latitude: 84.812437 * East-bound Longitude: 83.756425
Date/Time Start: 2025-07-12T09:11:17 * Date/Time End: 2025-08-27T09:23:31
Minimum Elevation: -4073.9 m * Maximum Elevation: -3011.6 m
Event(s):
PS149_13-1 (Ice Station 1a) * Latitude Start: 83.804469 * Longitude Start: 20.753587 * Latitude End: 83.856951 * Longitude End: 24.252349 * Date/Time Start: 2025-07-09T06:32:22 * Date/Time End: 2025-07-12T18:25:00 * Elevation Start: -4073.9 m * Elevation End: -4071.5 m * O2A Registry URI: https://registry.o2a-data.de/items/8891 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: # Ice Station 1a; Sea ice 1.4m thick on Gangway
PS149_16-1 (Ice Station 2a) * Latitude Start: 85.022741 * Longitude Start: 13.512829 * Latitude End: 84.686618 * Longitude End: 13.944513 * Date/Time Start: 2025-07-14T12:36:36 * Date/Time End: 2025-07-17T17:58:01 * Elevation Start: -3065.2 m * Elevation End: -3612.9 m * O2A Registry URI: https://registry.o2a-data.de/items/8891 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: # Ice station 2a
PS149_18-1 (Ice Station 3a) * Latitude Start: 84.482009 * Longitude Start: -17.876229 * Latitude End: 84.349051 * Longitude End: -17.886025 * Date/Time Start: 2025-07-19T17:45:41 * Date/Time End: 2025-07-22T18:00:00 * Elevation Start: -3392.7 m * Elevation End: -3407.1 m * O2A Registry URI: https://registry.o2a-data.de/items/8891 * Campaign: PS149 (CONTRASTS; ArcWatch 3) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: # Ice Station 3a
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Ringel, Maximilian Harald | |||
| 2 | DATE/TIME | Date/Time | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | Geocode | |
| 3 | LATITUDE | Latitude | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | Geocode | |
| 4 | LONGITUDE | Longitude | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | Geocode | |
| 5 | Identification | ID | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | filename of the corresponding hyperspectral image taken by the SpecimIQ camera. | |
| 6 | Image | IMAGE | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | ||
| 7 | Image (File Size) | IMAGE (Size) | Bytes | Ringel, Maximilian Harald | Hyperspectral camera Specim IQ | |
| 8 | Ice floe description | Floe descr | Ringel, Maximilian Harald | digit is giving the number of the floe, the letter the visit. For example, "2b" means it is the second visit of floe 2. See cruise report for more details. | ||
| 9 | Location | Location | Ringel, Maximilian Harald | original name of the measurement location on the floe. These site names were chosen in the field and used in the O2A registry before the locations_unified have been defined. | ||
| 10 | Location | Location | Ringel, Maximilian Harald | unified name of the measurement location on the floe. These site names are used throughout all publications related to CONTRASTS melt pond observations. | ||
| 11 | Transect length | Transect l | m | Ringel, Maximilian Harald | Tape measure | distance along the transect. |
| 12 | Azimuth | Azim | deg | Ringel, Maximilian Harald | Anglemeter | angle of the camera's viewing direction relative to the sun azimuthal angle. |
| 13 | Camera height | Cam height | m | Ringel, Maximilian Harald | Ruler stick (RULER) | height of the hyperspectral camera abvoe melt pond water surface. |
| 14 | Light description | Light descr | Ringel, Maximilian Harald | light conditions during the image. | ||
| 15 | Comment | Comment | Ringel, Maximilian Harald |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1241 data points