The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLII-3/W1
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W1, 125–132, 2017
https://doi.org/10.5194/isprs-archives-XLII-3-W1-125-2017
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3/W1, 125–132, 2017
https://doi.org/10.5194/isprs-archives-XLII-3-W1-125-2017

  25 Jul 2017

25 Jul 2017

AUTOMATIC DETECTION OF SECONDARY CRATERS AND MAPPING OF PLANETARY SURFACE AGE BASED ON LUNAR ORBITAL IMAGES

A. L. Salih1, A. Lompart1, A. Grumpe1, C. Wöhler1, and H. Hiesinger2 A. L. Salih et al.
  • 1Image Analysis Group, TU Dortmund, Dortmund, Germany
  • 2Institut für Planetologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Keywords: Automatic crater detection; Absolute model age; Cater size-frequency distribution; Secondary craters

Abstract. Ages of planetary surfaces are typically obtained by manually determining the impact crater size-frequency distribution (CSFD) in spacecraft imagery, which is a very intricate and time-consuming procedure. In this work, an image-based crater detection algorithm that relies on a generative template matching technique is applied to establish the CSFD of the floor of the lunar farside crater Tsiolkovsky. The automatic detection threshold value is calibrated based on a 100 km² test area for which the CSFD has been determined by manual crater counting in a previous study. This allows for the construction of an age map of the complete crater floor. It is well known that the CSFD may be affected by secondary craters. Hence, our detection results are refined by applying a secondary candidate detection (SCD) algorithm relying on Voronoi tessellation of the spatial crater distribution, which searches for clusters of craters. The detected clusters are assumed to result from the presence of secondary craters, which are then removed from the CSFD. We found it favourable to apply the SCD algorithm separately to each diameter bin of the CSFD histogram. In comparison with the original age map, the refined age map obtained after removal of secondary candidates has a more homogeneous appearance and does not exhibit regions of spuriously high age resulting from contamination by secondary craters.