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  Detecting and analysing geomorphological structures in images of comet 67P/Churyumov–Gerasimenko using Fourier transform

Ruzicka, B.-K., Schröter, M., Pack, A., & Böhnhardt, H. (2021). Detecting and analysing geomorphological structures in images of comet 67P/Churyumov–Gerasimenko using Fourier transform. Monthly Notices of the Royal Astronomical Society, 503(3), 3449-3459. doi:10.1093/mnras/stab618.

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 Creators:
Ruzicka, Birko-Katarina1, Author              
Schröter, Matthias, Author
Pack, Andreas, Author
Böhnhardt, Hermann1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: methods: data analysis, techniques: image processing, comets: general, comets: individual: 67P/Churyumov–Gerasimenko
 Abstract: We present a method for automatized detection and analysis of quasi-periodic lineament structures from images at pixel precision. The method exploits properties of the images’ frequency domain found by using the Fourier transform. We developed this method with the goal of detecting lineament structures in an image of the Hathor cliff of comet 67P/Churyumov–Gerasimenko, which are caused by layerings and furrows in the nucleus material. Using our method, we determined the orientation and wavelength range of these structures. The detected layering edges have similar orientations and spatial separations of 9–20 m, and are ubiquitous throughout the image. We suggest that the layerings are a global feature of the comet nucleus that provide information about formation and evolution of comet 67P. The furrows are non-uniformly distributed throughout the image. Their orientation is broadly parallel to the direction of the local gravity vector at the Hathor cliff, with spacings similar to those of the layering structures. The furrows are interpreted as signatures of local down-slope movement of cliff material. We demonstrate that the developed method is broadly applicable to the detection and analysis of various kinds of quasi-periodic structures like geological layering, folding and faulting, and texture analysis in general. In order to facilitate the application of our method, this paper is accompanied by a demo program written in matlab.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab618
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 503 (3) Sequence Number: - Start / End Page: 3449 - 3459 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150