/* DATA DESCRIPTION:
Citation:	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.970485
Abstract:	Sea ice surface roughness data were obtained during the GreenIce campaign in May, 2004 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Helicopter (Unknown model). 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 (RIEGL - LD90) are provided at a sampling rate of 100 Hz. Sensor accuracy is 5 cm with a beam diameter at surface of 5.8 cm. This dataset includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 5.8 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:	Haas, Christian; Hendricks, Stefan; Doble, M (2006): Comparison of the sea ice thickness distribution in the Lincoln Sea and adjacent Arctic Ocean in 2004 and 2005. Annals of Glaciology, 44(1), 247-252, https://doi.org/10.3189/172756406781811781
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: 84.631764 * MEDIAN LONGITUDE: -69.961425 * SOUTH-BOUND LATITUDE: 82.690568 * WEST-BOUND LONGITUDE: -81.244499 * NORTH-BOUND LATITUDE: 85.872000 * EAST-BOUND LONGITUDE: -60.452578
	DATE/TIME START: 2004-05-12T16:26:27 * DATE/TIME END: 2004-05-13T22:07:41
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Size:	22 datasets
*/
/* TABULAR SUMMARY OF DATASETS LISTED IN THIS COLLECTION: */
Filename	Citation of child dataset
GreenICE2004_SBLA_20040512T1622_82.84_-62.44_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T1622_82.84_-62.44_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970477
GreenICE2004_SBLA_20040512T1641_83.14_-63.80_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T1641_83.14_-63.80_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970478
GreenICE2004_SBLA_20040512T1659_83.39_-66.32_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T1659_83.39_-66.32_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970479
GreenICE2004_SBLA_20040512T1716_83.76_-67.51_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T1716_83.76_-67.51_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970482
GreenICE2004_SBLA_20040512T1740_84.26_-67.51_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T1740_84.26_-67.51_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970483
GreenICE2004_SBLA_20040512T1806_84.72_-69.20_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T1806_84.72_-69.20_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970481
GreenICE2004_SBLA_20040512T2058_84.76_-75.84_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T2058_84.76_-75.84_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970480
GreenICE2004_SBLA_20040512T2112_84.63_-79.52_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T2112_84.63_-79.52_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970464
GreenICE2004_SBLA_20040512T2319_84.76_-80.27_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T2319_84.76_-80.27_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970462
GreenICE2004_SBLA_20040512T2336_84.82_-77.20_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T2336_84.82_-77.20_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970465
GreenICE2004_SBLA_20040512T2357_84.87_-72.88_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040512T2357_84.87_-72.88_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970467
GreenICE2004_SBLA_20040513T1322_84.88_-71.01_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1322_84.88_-71.01_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970463
GreenICE2004_SBLA_20040513T1337_84.93_-67.77_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1337_84.93_-67.77_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970466
GreenICE2004_SBLA_20040513T1359_84.98_-63.01_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1359_84.98_-63.01_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970474
GreenICE2004_SBLA_20040513T1601_84.80_-61.65_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1601_84.80_-61.65_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970468
GreenICE2004_SBLA_20040513T1613_84.84_-64.81_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1613_84.84_-64.81_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970469
GreenICE2004_SBLA_20040513T1629_84.86_-69.66_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1629_84.86_-69.66_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970472
GreenICE2004_SBLA_20040513T1834_84.99_-72.15_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1834_84.99_-72.15_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970470
GreenICE2004_SBLA_20040513T1851_85.31_-72.14_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1851_85.31_-72.14_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970471
GreenICE2004_SBLA_20040513T1909_85.68_-72.12_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1909_85.68_-72.12_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970473
GreenICE2004_SBLA_20040513T2123_85.59_-70.49_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T2123_85.59_-70.49_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970475
GreenICE2004_SBLA_20040513T2157_84.95_-71.96_thr06_data_Vers5.tab	Hendricks, Stefan; Haas, Christian; Krumpen, Thomas (2024): Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T2157_84.95_-71.96_thr06_data_Vers5. https://doi.org/10.1594/PANGAEA.970476
