Dumke, Ines; Nornes, Stein (2017): Hyperspectral imager (UHI) data files acquired on SONNE cruise SO242/2, ROV dive SO242/191-1. PANGAEA, https://doi.org/10.1594/PANGAEA.874408, Supplement to: Dumke, Ines; Nornes, Stein; Purser, Autun; Marcon, Yann; Ludvigsen, Martin; Ellefmo, Steinar L; Johnsen, Geir; Søreide, Fredrik (2018): First hyperspectral imaging survey of the deep seafloor: High-resolution mapping of manganese nodules. Remote Sensing of Environment, 209, 19-30, https://doi.org/10.1016/j.rse.2018.02.024
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Hyperspectral seafloor surveys using airborne or spaceborne sensors are generally limited to shallow coastal areas, due to the requirement for target illumination by sunlight. Deeper marine environments devoid of sunlight cannot be imaged by conventional hyperspectral imagers. Instead, a close-range, sunlight-independent hyperspectral survey approach is required. In this study, we present the first hyperspectral image data from the deep seafloor. The data were acquired in approximately 4200 m water depth using a new Underwater Hyperspectral Imager (UHI) mounted on a remotely operated vehicle (ROV). UHI data were recorded for 112 spectral bands between 378 nm and 805 nm, with a high spectral (4 nm) and spatial resolution (1 mm per image pixel). The study area was located in a manganese nodule field in the Peru Basin (SE Pacific), close to the DISCOL (DISturbance and reCOLonization) experimental area. To test whether underwater hyperspectral imaging can be used for detection and mapping of mineral deposits in potential deep-sea mining areas, we compared two supervised classification methods, the Support Vector Machine (SVM) and the Spectral Angle Mapper (SAM). The results show that SVM is superior to SAM and is able to accurately detect nodule surfaces. The UHI therefore represents a promising tool for high-resolution seafloor exploration and characterisation prior to resource exploitation.
Boetius, Antje (2015): RV SONNE Fahrtbericht / Cruise Report SO242-2: JPI OCEANS Ecological Aspects of Deep-Sea Mining, DISCOL Revisited, Guayaquil - Guayaquil (Equador), 28.08.-01.10.2015. GEOMAR Report (N. Ser.), 27, 552 pp, https://doi.org/10.3289/GEOMAR_REP_NS_27_2015
Median Latitude: -7.089720 * Median Longitude: -88.446084 * South-bound Latitude: -7.090050 * West-bound Longitude: -88.446302 * North-bound Latitude: -7.089529 * East-bound Longitude: -88.445941
Date/Time Start: 2015-09-13T16:00:04 * Date/Time End: 2015-09-14T18:18:03
Minimum Elevation: -4194.7 m * Maximum Elevation: -4185.4 m
SO242/2_191_HYSP-1 * Latitude Start: -7.089529 * Longitude Start: -88.446018 * Latitude End: -7.089548 * Longitude End: -88.446021 * Date/Time Start: 2015-09-13T16:51:48 * Date/Time End: 2015-09-13T16:52:33 * Elevation Start: -4194.5 m * Elevation End: -4194.5 m * Location: South Pacific Ocean, Peru Basin * Campaign: SO242/2 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Hyperspectral Imager/Profiler (HYSP) * Comment: Action: on ground/max depth; Position sensor: USBL; Comment: Sample SO242-2_D191_HYSP_1: SO242_2_191_0913_1651: First UHI recording. Scan of the plastic piece. Setting forward power to 2 % for constant velocity approx. 0.05 m/s, altitude 1.2m. No LED light, other lamps on. 2m transect
SO242/2_191_HYSP-2 * Latitude Start: -7.089580 * Longitude Start: -88.446028 * Latitude End: -7.089587 * Longitude End: -88.446033 * Date/Time Start: 2015-09-13T16:55:15 * Date/Time End: 2015-09-13T16:56:22 * Elevation Start: -4194.5 m * Elevation End: -4194.4 m * Location: South Pacific Ocean, Peru Basin * Campaign: SO242/2 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Hyperspectral Imager/Profiler (HYSP) * Comment: Action: on ground/max depth; Position sensor: USBL; Comment: Sample SO242-2_D191_HYSP_2: SO242_2_191_0913_1655: 3 m transect. Contains nodule and possibly small sponge. Ophiurid passed at approx 16:56:00.
SO242/2_191_HYSP-3 * Latitude Start: -7.089602 * Longitude Start: -88.446041 * Latitude End: -7.089606 * Longitude End: -88.446042 * Date/Time Start: 2015-09-13T16:58:53 * Date/Time End: 2015-09-13T16:59:40 * Elevation Start: -4194.4 m * Elevation End: -4194.4 m * Location: South Pacific Ocean, Peru Basin * Campaign: SO242/2 (JPI-OCEANS) * Basis: Sonne_2 * Method/Device: Hyperspectral Imager/Profiler (HYSP) * Comment: Action: on ground/max depth; Position sensor: USBL; Comment: Sample SO242-2_D191_HYSP_3: SO242_2_191_0913_1658: 2 m transect. LED-lamps were turned on from this scan until the end. All available lighting on.
zip archives contain UHI bsq file and header filetracks 1-14: processed and georeferenced UHI pseudo-reflectance datatrack 15: processed UHI pseudo-reflectance data
80 data points