Abstract
A seamless mosaic has been constructed including a 3D terrain model at 50 m grid-spacing and a corresponding terrain-corrected orthoimage at 12.5 m using a novel approach applied to ESA Mars Express High Resolution Stereo Camera orbital (HRSC) images of Mars. This method consists of blending and harmonising 3D models and normalising reflectance to a global albedo map. Eleven HRSC image sets were processed to Digital Terrain Models (DTM) based on an opensource stereo photogrammetric package called CASP-GO and merged with 71 published DTMs from the HRSC team. In order to achieve high quality and complete DTM coverage, a new method was developed to combine data derived from different stereo matching approaches to achieve a uniform outcome. This new approach was developed for high-accuracy data fusion of different DTMs at dissimilar grid-spacing and provenance which employs joint 3D and image co-registration, and B-spline fitting against the global Mars Orbiter Laser Altimeter (MOLA) standard reference. Each HRSC strip is normalised against a global albedo map to ensure that the very different lighting conditions could be corrected and resulting in a tiled set of seamless mosaics. The final 3D terrain model is compared against the MOLA height reference and the results shown of this intercomparison both in altitude and planum. Visualisation and access mechanisms to the final open access products are described.
Highlights
IntroductionThe system is more than 4,000 km long, 200 km wide, and up to 10 km deep with respect to the surrounding plateaus
Valles Marineris on Mars are the largest system of canyons in the Solar System
The 71 DLR High Resolution Stereo Camera orbital (HRSC) level 4 Digital Terrain Models (DTM) cover most of the Valles Marineris region but leave several significant gaps
Summary
The system is more than 4,000 km long, 200 km wide, and up to 10 km deep with respect to the surrounding plateaus Because of their sheer size Valles Marineris have been a subject of growing number of studies since the Viking era and we know that they have been subject to a wide variety of processes throughout their history. Estimated to be approximately 3.5 Ga old [1], the superstructure is related to tectonic rifting of the crust related in part to the loading induced by the Tharsis Volcanic province [1,2,3,4] This overall tectonic structure has been modified by outflows [5,6,7,8], fluvial processes [7,9,10,11].
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