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# 3D reconstruction of the final PHILAE landing site: Abydos

Abstract : The Abydos region is the region of the final landing site of the PHILAE lander. The landing site has been potentially identified on images of this region acquired by the OSIRIS imaging system aboard the orbiter before (Oct 22, 2014) and after (Dec 6-13, 2014) the landing of PHILAE (Lamy et al., in prep.). Assuming that this identification is correct, we reconstructed the topography of Abydos in 3D using a method called multiresolution photoclinometry by deformation'' (MPCD, Capanna et al., The Visual Computer, 29(6-8): 825-835, 2013). The method works in two steps: (a) a DTM of this region is extracted from the global MPCD shape model, (b) the resulting triangular mesh is progressively deformed at increasing spatial resolution in order to match a set of 14 images of Abydos at pixel resolutions between 1 and 8 m. The method used to perform the image matching is the L-BFGS-b non-linear optimization (Morales et al., ACM Trans. Math. Softw., 38(1): 1-4, 2011).In spite of the very unfavourable illumination conditions, we achieve a vertical accuracy of about 3 m, while the horizontal sampling is 0.5 m. The accuracy is limited by high incidence angles on the images (about 60 deg on average) combined with a complex topography including numerous cliffs and a few overhangs. We also check the compatibility of the local DTM with the images obtained by the CIVA-P instrument aboard PHILAE. If the Lamy et al. identification is correct, our DTM shows that PHILAE landed in a cavity at the bottom of a small cliff of 8 m height.
Document type :
Conference papers

https://hal-insu.archives-ouvertes.fr/insu-03580895
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Submitted on : Friday, February 18, 2022 - 6:48:51 PM
Last modification on : Sunday, February 20, 2022 - 3:02:03 AM

### Citation

Claire Capanna, Laurent Jorda, Philippe Lamy, Gilles Gesquière, Cédric Delmas, et al.. 3D reconstruction of the final PHILAE landing site: Abydos. American Astronomical Society, 0000, à renseigner, Unknown Region. p.2644-2652. ⟨insu-03580895⟩

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