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Toward high-resolution global topography of Mercury from MESSENGER orbital stereo imaging: A prototype model for the H6 (Kuiper) quadrangle

Preusker, Frank and Stark, Alexander and Oberst, J. and Matz, Klaus-Dieter and Gwinner, Klaus and Roatsch, Thomas and Watters, Tom R. (2017) Toward high-resolution global topography of Mercury from MESSENGER orbital stereo imaging: A prototype model for the H6 (Kuiper) quadrangle. Planetary and Space Science, 142, pp. 26-37. Elsevier. DOI: 10.1016/j.pss.2017.04.012 ISSN 0032-0633

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Abstract

We selected approximately 10,500 narrow-angle camera (NAC) and wide-angle camera (WAC) images of Mercury acquired from orbit by MESSENGER's Mercury Dual Imaging System (MDIS) with an average resolution of 150 m/pixel to compute a digital terrain model (DTM) for the H6 (Kuiper) quadrangle, which extends from 22.5 degrees S to 22.5 degrees N and from 288.0 degrees E to 360.0 degrees E. From the images, we identified about 21,100 stereo image combinations consisting of at least three images each. We applied sparse multi-image matching to derive approximately 250,000 tie-points representing 50,000 ground points. We used the tie-points to carry out a photogrammetric block adjustment, which improves the image pointing and the accuracy of the ground point positions in three dimensions from about 850 m to approximately 55 m. We then applied high-density (pixel-by-pixel) multi-image matching to derive about 45 billion tie-points. Benefitting from improved image pointing data achieved through photogrammetric block adjustment, we computed about 6.3 billion surface points. By interpolation, we generated a DTM with a lateral spacing of 221.7 m/pixel (192 pixels per degree) and a vertical accuracy of about 30 m. The comparison of the DTM with Mercury Laser Altimeter (MLA) profiles obtained over four years of MESSENGER orbital operations reveals that the DTM is geometrically very rigid. It may be used as a reference to identify MLA outliers (e.g., when MLA operated at its ranging limit) or to map offsets of laser altimeter tracks, presumably caused by residual spacecraft orbit and attitude errors. After the relevant outlier removals and corrections, MLA profiles show excellent agreement with topographic profiles from H6, with a root mean square height difference of only 88 m.

Item URL in elib:https://elib.dlr.de/115200/
Document Type:Article
Title:Toward high-resolution global topography of Mercury from MESSENGER orbital stereo imaging: A prototype model for the H6 (Kuiper) quadrangle
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Stark, AlexanderAlexander.Stark (at) dlr.deUNSPECIFIED
Oberst, J.juergen.oberst (at) dlr.deUNSPECIFIED
Matz, Klaus-Dieterklaus-dieter.matz (at) dlr.deUNSPECIFIED
Gwinner, KlausKlaus.Gwinner (at) dlr.deUNSPECIFIED
Roatsch, ThomasThomas.Roatsch (at) dlr.deUNSPECIFIED
Watters, Tom R.ceps, national air and space museum, smithsonian institution, washington, dc 20560UNSPECIFIED
Date:August 2017
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:142
DOI :10.1016/j.pss.2017.04.012
Page Range:pp. 26-37
Publisher:Elsevier
ISSN:0032-0633
Status:Published
Keywords:Mercury, MESSENGER, Stereo photogrammetry, Topography, Hun Kal, DTM
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Geology
Deposited By: Scholten, Dipl.-Ing. Frank
Deposited On:10 Nov 2017 12:54
Last Modified:31 Jul 2019 20:12

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