/* DATA DESCRIPTION:
Citation:	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.970659
Abstract:	Sea ice surface roughness data were obtained during the IceBird winter campaign in Apr, 2019 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by an Airplane (Basler BT-67, Polar-6). A method developed by Hibler (1972) was used to a) isolate the surface profile from low-frequency variations associated with the aircraft motion and b) to identify pressure ridge sails. The processing steps are described in https://epic.awi.de/id/eprint/56364/. We applied a ridge detection threshold of 0.6 m, which means that only sails higher 0.6 m are detected. Version and name of the processing routine: Laser_Altimeter_Processing_VS5_06_20.py (vers.5, Feb 22, 2024, https://gitlab.awi.de/sitem/sbla_processing.git). SBLA records (ASTECH - LDM) are provided at a sampling rate of 100 Hz. Sensor accuracy is 2 cm with a beam diameter at surface of 6.3 cm. This dataset includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 6.3 cm .
Keyword(s):	Laser Altimeter; Ridge Height; Ridge Spacing; Ridge Width; Sea Ice Surface Roughness
Supplement to:	Krumpen, Thomas; von Albedyll, Luisa; Bünger, Hans Jakob; Castellani, Giulia; Hartmann, Jörg; Helm, Veit; Hendricks, Stefan; Hutter, Nils; Landy, Jack; Lisovski, Simeon; Lüpkes, Christof; Rohde, Jan; Suhrhoff, Mira; Haas, Christian (2025): Smoother sea ice with fewer pressure ridges in a more dynamic Arctic. Nature Climate Change, https://doi.org/10.1038/s41558-024-02199-5
Related to:	Hendricks, Stefan; Ricker, Robert; Jutila, Arttu (2019): IceBird 2019 Winter: ICESat-2 Validation Data Acquisition Report. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, hdl:10013/epic.c5dfe9f3-a928-4706-addc-b5b8f3af723a
Related code / software:	Electromagnetic induction sounding of sea-ice thickness / SBLA_Processing · GitLab (URI: https://gitlab.awi.de/sitem/sbla_processing.git)
Data processing report:	Suhrhoff, Mira (2021): Sea Ice Surface Roughness from Single Beam Laser Altimeter Measurements - Method Development and Comparison with Airborne Laser Scanner Profiles [thesis]. Universität Trier, hdl:10013/epic.30c63deb-b1f5-4c1e-927b-3d8a8d495b82
Coverage:	MEDIAN LATITUDE: 74.989249 * MEDIAN LONGITUDE: -117.422420 * SOUTH-BOUND LATITUDE: 70.044396 * WEST-BOUND LONGITUDE: -132.759550 * NORTH-BOUND LATITUDE: 84.498722 * EAST-BOUND LONGITUDE: -54.361310
	DATE/TIME START: 2019-04-02T19:07:03 * DATE/TIME END: 2019-04-10T19:17:36
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Size:	18 datasets
*/
/* TABULAR SUMMARY OF DATASETS LISTED IN THIS COLLECTION: */
Filename	Citation of child dataset
P6_217_ICEBIRD_2019_SBLA_20190402T1703_82.31_-96.35_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190402T1703_82.31_-96.35_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970650
P6_217_ICEBIRD_2019_SBLA_20190402T1732_82.79_-99.08_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190402T1732_82.79_-99.08_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970647
P6_217_ICEBIRD_2019_SBLA_20190402T1752_83.16_-101.51_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190402T1752_83.16_-101.51_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970654
P6_217_ICEBIRD_2019_SBLA_20190405T1712_83.48_-62.44_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190405T1712_83.48_-62.44_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970655
P6_217_ICEBIRD_2019_SBLA_20190405T1738_84.20_-57.05_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190405T1738_84.20_-57.05_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970658
P6_217_ICEBIRD_2019_SBLA_20190407T1833_70.40_-132.75_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190407T1833_70.40_-132.75_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970656
P6_217_ICEBIRD_2019_SBLA_20190407T1900_71.20_-132.75_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190407T1900_71.20_-132.75_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970657
P6_217_ICEBIRD_2019_SBLA_20190407T1926_71.82_-132.75_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190407T1926_71.82_-132.75_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970642
P6_217_ICEBIRD_2019_SBLA_20190407T1944_72.42_-132.42_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190407T1944_72.42_-132.42_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970645
P6_217_ICEBIRD_2019_SBLA_20190407T2013_72.52_-130.16_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190407T2013_72.52_-130.16_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970646
P6_217_ICEBIRD_2019_SBLA_20190407T2043_72.51_-127.84_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190407T2043_72.51_-127.84_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970643
P6_217_ICEBIRD_2019_SBLA_20190408T1729_71.49_-126.80_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190408T1729_71.49_-126.80_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970644
P6_217_ICEBIRD_2019_SBLA_20190408T1752_71.58_-127.75_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190408T1752_71.58_-127.75_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970641
P6_217_ICEBIRD_2019_SBLA_20190408T1804_71.09_-127.73_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190408T1804_71.09_-127.73_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970648
P6_217_ICEBIRD_2019_SBLA_20190410T1509_70.69_-130.87_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190410T1509_70.69_-130.87_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970649
P6_217_ICEBIRD_2019_SBLA_20190410T1548_71.84_-131.35_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190410T1548_71.84_-131.35_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970651
P6_217_ICEBIRD_2019_SBLA_20190410T1617_72.68_-131.72_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190410T1617_72.68_-131.72_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970652
P6_217_ICEBIRD_2019_SBLA_20190410T1647_73.61_-132.17_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the IceBird winter campaign in Apr, 2019; profile P6_217_ICEBIRD_2019_SBLA_20190410T1647_73.61_-132.17_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970653
