Both scanners are mobile and shall serve onboard MARUM GeoB expeditions for routine, high-quality optical documentation of GeoB core split sections.
- Schäfter+Kirchhoff Triple Line Scan Camera SK12240GKOC-LB
- APO Rodagon lens N (1:2,8/f=50 mm) for 250 dpi resolution
- APO Rodagon lens 2Dx (1:4,5/f=75 mm) for 500 dpi and 1000 dpi resolution
- max. scan lengh: 160 cm
- max. core diameter: 20 cm
- directly connected to ExpeditionDIS-GeoB / CurationDIS-GeoB
- RGB-value output as txt
|Resolution||Duration (Min:Sec / 100 cm)|
|250 dpi DOF mode||03:40|
|500 dpi DOF mode||06:30|
|1000 dpi DOF mode||12:42|
DOF = Depth-of-field mode - to enhance depth of field for inclined surfaces. For 500 dpi and 250 dpi default depth of field is sufficient and extra DOF mode is only necessary for heavily inclined surfaces (>1-1,5 cm focus level difference).
In a first step a standard white balance correction of the individual R, G, and B components is performed.
Secondly for an absolute color reproduction of the line scan camera, a standardized color calibration is achieved by using an IT8.7/2 target of defined size and color palette. The IT8-target is imaged by the scanner and an ICC-profile (ICC = International Color Consortium) is calculated on the basis of the defined reference values. Applying this ICC-profile to the digital line scans of the core sections afford best matches with true sediment colors and absolute comparability. Application of ICC-profiles is automatically done while processing the scan images in the lates version of smartCIS steering software.
Methodology Text Module
Users are welcome to adopt the following methodological text module as a template for cruise reports or other scientific publications. Please adapt setting specifications were necessary!
Sediment Core Imaging
Longitudinal split open core sections were imaged using the SmartCIS 1600LS line scanning system of the MARUM GeoB Core Repository (www.marum.de/en/Infrastructure/GeoBsmartCIS-1600-Line-Scanner.html). Split surfaces of each section was freshly scraped immediately prior to imaging in order to capture the ephemeral nature of sedimentary features as some features oxidize within minutes. All images were acquired at a standard resolution of 500dpi (250dpi/ 1000dpi). In order to retain the relative variability in sediment lightness throughout the expedition camera aperture was fixed at f/8. This aperture setting imaged most sediments without the need for further adjustment. All sections were scanned using two light sources in order to achieve best lighting situations and reduce potential shadow effects of rough surfaces. A white calibration of the system was done on daily basis using a standardized white tile. Absolute color reproduction of the line scan images is ensured through the automatic application of a IT8.7/2-target referenced ICC-profile built-in the steering software of the line scanner. Section images were directly saved to the curatical database system ExpeditionDIS as jpeg files. Output also included a tab-delimited text file with red, green, blue, lightness (%) values as well as red/blue ratios in 1 mm down-core resolution for each section.
Line Scanner 1
|20 May - 17 Aug 2015||MSM44 (D. Hebbeln)|
|28 Sept - 2 Oct 2015||POS482 Onshore Sampling Party (H. Lantzsch)|
|14 Oct 2015 - 30 March 2016||M122 (D. Hebbeln) & M123 (M. Zabel)|
|18 - 22 April 2016||Anke Schürer (AG Dobeneck)|
|10 - 24 June 2016||Claudia Wienberg|
|27 - 28 June 2016||SO245 Core Opening + Scanning|
|4 July 2016 - 5 Oct 2016||MSM57/1+2 (G. Bohrmann)|
|13 - 21 October 2016||Anke Schürer (AG Dobeneck)|
|24 Oct 2016 - 10 April 2017||M134 (G. Bohrmann)|
|15 - 19 May 2017||Torsten Bickert (PS104 Sampling Party)|
|22 - 24 May 2017||Jürgen Pätzold|
|12 - 16 June 2017||Claudia Wienberg|
|19 June - 19 Sept 2017||MSM66 (B. Dorschel, D. Hebbeln, M. Kucera, M. Bartels)|
|Dec 2017 - 11 April 2018||SO260 (S. Kasten)|
|14 June - Mid-Nov 2018||M149 (A. Kopf)|
|Mid-March - Mid-July 2019||M154-2 (K. Huhn)|
|24 Oct 2019 - End Aug 2020||SO272 (Th. Westerhold) & SO275 (D. Hebbeln, C. Wienberg)|
Line Scanner 2
|24 Sept 2015 - 21 Dec 2015||MSM48 (K. Zonneveld)|
|11 Jan 2016 - 17 June 2016||SO247 (K. Huhn)|
|27 June - 1 July 2016||Heiko Sahling (POS498 Cores)|
|04 Aug 2016 - 04 Jan 2017||SO251/1+2 (A. Kopf)|
|13 Jan 2017 - 24 July 2017||SO256 (M. Mohtadi)|
|18 Sept 2017 - 8 Feb 2018||M142 (G. Bohrmann)|
|02 Aug 2018 - Jan 2019||SO266 (G. Bohrmann)|
|01 March 2020 - Mid-June 2020||M163 (K. Zonneveld)|
|Early Dec 2020 - Mid-April 2021||SO281 (T. Schwenk, E. Miramontes)|
List of scanned cores
The default save pathway for GeoB section line scan images is directly into our curatorial database system DIS (Drilling Information System). The GeoB-DIS (both in expedition as well as curation version) provides two sorts of pre-defined PDF core overview reports inlcuding line scan images:
- Core Overview Tab (showing up to 10 sections per page incl. a section list table on the right-hand side)
- Core Overview Image (showing up to 6 sections per page)
For further processing of GeoB core section line scan images the MARUM GeoB Core Repository applies a specifically designed GeoB macro collection used in WaveMetrics IGOR Pro (www.wavemetrics.com).
These macros enable quick creation of composite images for a whole MeBo drill site or a whole gravity core on one sheet. The macro collection also includes a template to easily create one page overview plots incl. line profile data, e.g. red/blue ratio or lightness, for publication in cruise reports.
Example 1 - 500 dpi scan
GeoB3911-3; 0-97 cm; Archive; 500 dpi
Example 2 - 1000 dpi scan
GeoB18123-2; 8P-1A; 1000 dpi DOF mode
Example 3 - one vs. two light sources
Comparison one vs. two light sources
Example 4 - scanning other sample objects
Stromatolith from lower Buntsandstein at Wilhelmshall, Huy, Northern Germany
Stromatolith from Münder Formation at Thüste, Upper Jurassic, Northern Germany