Skip to content

Research at St Andrews

Global analysis of gully composition using manual and automated exploration of CRISM imagery

Research output: Contribution to journalArticle

Open Access Status

  • Embargoed (until 29/11/19)

Author(s)

Elyse Allender, Tomasz F. Stepinksi

School/Research organisations

Abstract

Gully formations on Mars have been the focus of many morphological and mineralogical studies aimed at inferring the mechanisms of their formation and evolution. In this paper we have analyzed 354 globally distributed gully-bearing Full Resolution Targeted (FRT) Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) images. The primary goal of the analysis was to identify all spectrally distinct deposits in these images (if any) and to classify them into hydrated and non-hydrated categories using only CRISM summary parameters (Viviano-Beck et al., 2014). Such an approach makes it possible to analyze a very large set of all distinct deposits in 354 images. We found that 68% of these images lack any distinct deposits, 8% of images contain non-hydrated deposits which coincide with the gullies and 24% of images contain hydrated deposits which coincide with the gullies. These results are compared with the recent analysis of 110 CRISM images by Nuñez et al. (2016) who also found that most gullies coincide with indistinct deposits, but, contrary to our findings, they found a predominance of non-hydrated minerals among distinct deposits. We attribute this discrepancy in part to their smaller and geographically biased sample of images, and in part to differing protocols of categorizing images. The discrepancy between the two surveys is further increased if we count all deposits in FRT gully-bearing images, not just deposits directly coinciding with the gullies, obtaining 44% indistinct, 15% non-hydrated, and 41% hydrated images. The secondary goal of this study was to perform the same image survey using a recently developed automated method in order to assess its accuracy and thus its feasibility for performing future surveys. We found the overall accuracy of the auto-mapper to be 76.2% but its accuracy for discovering distinct deposits, and in particular, distinct hydrated deposits was lower. We attributed the deficiencies of the auto-mapper primarily to its sensitivity to presence of noise in images and especially to presence of speckle noise. It is however worth noting that qualitatively both manual and automatic surveys arrived at the same overall conclusion.
Close

Details

Original languageEnglish
Pages (from-to)319-329
Number of pages10
JournalIcarus
Volume302
Early online date22 Nov 2017
DOIs
StatePublished - 1 Mar 2018

    Research areas

  • Mars, CRISM, Gullies formation, Mineral composition, Automatic analysis

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. UV luminescence characterisation of organics in Mars-analogue substrates

    Laurent, B., Cousins, C. R., Gunn, M., Huntly, C., Cross, R. & Allender, E. 18 Dec 2018 In : Icarus. 321, p. 929-937

    Research output: Contribution to journalArticle

  2. The ExoMars Spectral Tool (ExoSpec): an image analysis tool for ExoMars 2020 PanCam imagery

    Allender, E., Stabbins, R., Gunn, M., Cousins, C. R. & Coates, A. 9 Oct 2018 Image and Signal Processing for Remote Sensing XXIV: Proceedings of SPIE: Remote Sensing. Bruzzone, L. & Bovolo, F. (eds.). Vol. 10789, 107890I

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  3. Traverses for the ISECG-GER Design Reference Mission for humans on the lunar surface

    Allender, E., Orgel, C., Almeida, N., Cook, J., Ende, J., Kamps, O., Mazrouei, S., Slezak, T., Soini, A-J. & Kring, D. 31 Aug 2018 In : Advances in Space Research. In press

    Research output: Contribution to journalArticle

  4. Automatic, exploratory mineralogical mapping of CRISM imagery using summary product signatures

    Allender, E. & Stepinski, T. F. 1 Jan 2017 In : Icarus. 281, p. 151-161 10 p.

    Research output: Contribution to journalArticle

Related by journal

  1. UV luminescence characterisation of organics in Mars-analogue substrates

    Laurent, B., Cousins, C. R., Gunn, M., Huntly, C., Cross, R. & Allender, E. 18 Dec 2018 In : Icarus. 321, p. 929-937

    Research output: Contribution to journalArticle

  2. Anoxic atmospheres on Mars driven by volcanism: implications for past environments and life

    Sholes, S. F., Smith, M. L., Claire, M. W., Zahnle, K. J. & Catling, D. C. 1 Jul 2017 In : Icarus. 290, p. 46-62 17 p.

    Research output: Contribution to journalArticle

  3. Automatic, exploratory mineralogical mapping of CRISM imagery using summary product signatures

    Allender, E. & Stepinski, T. F. 1 Jan 2017 In : Icarus. 281, p. 151-161 10 p.

    Research output: Contribution to journalArticle

  4. Low surface gravitational acceleration of Mars results in a thick and weak lithosphere: implications for topography, volcanism, and hydrology

    Heap, M. J., Byrne, P. K. & Mikhail, S. 1 Jan 2017 In : Icarus. 281, p. 103-114 12 p.

    Research output: Contribution to journalArticle

ID: 251713044