Topographic correction of HiRISE and CaSSIS images: Validation and application to color observations of Martian albedo features

Munaretto, G.; Pajola, M.; Lucchetti, A.; Re, C.; Cremonese, G.; Simioni, E.; Cambianica, P.; Thomas, N. (2021). Topographic correction of HiRISE and CaSSIS images: Validation and application to color observations of Martian albedo features. Planetary and space science, 200, p. 105198. Elsevier 10.1016/j.pss.2021.105198

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The topographic correction of satellite images has to be applied to both disentangle albedo features from illumination effects induced by local topography and performspectrophotometric analyses of planetary surfaces. This work focuses on the modeling and removal of surface brightness variations induced by topography, referred astopographic shading, from high resolution images of Mars. Topographic shading can be modeled through functions of the surface illumination and observation anglescalled disk functions. We consider four disk functions that are widely used in planetary photometry: the Lambert, Lommel-Seeliger, Akimov and Minnaert diskfunctions. We test and evaluate their performances in removing topographic shading from High Resolution Imaging Science Experiment (HiRISE) and Colour andSurface Science Imaging System (CaSSIS) images. We here validate our method, moreover, we report scientific applications to single or multi-band datasets byanalyzing topographically corrected HiRISE colour observations of Martian recurring slope lineae and dust devil tracks, as well as CaSSIS panchromatic observations.

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