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New insights from old software: Gridview brings out hidden tectonic features of Mars
Abstract:
<p>This paper presents a novel application of the Goddard Space Flight Center's Gridview, a program facilitating analysis of gridded data from the Mars Orbiter Laser Altimeter (MOLA). Gridview, last updated in 2011, provides access to MOLA datasets at several spatial resolutions. It allows construction of shaded relief maps with control over hypsometric color schemes, greyscale, vertical exaggeration, and the altitude and azimuth of illumination source. I built several greyscale visualizations in Gridview, covering the planet along the -15° parallel at every 30° of longitude in stereoscopic projection of the MOLA32 database. For each, I set vertical exaggeration at 1,000 times and illumination at 15° above the local horizon in a full circle every 30° of azimuth. The twelve output images for each longitude were placed in a single presentation for that longitude, for a total of twelve files. Each allows “animation” of the light source to enable megageomorphic analysis of different Martian regions. Findings include (1) long-wavelength ridges in Terra Cimmeria; (2) a hemisphere scale ridge or, in places, a graben-like pair of ridges spanning from western Terra Cimmeria, through Terra Sirenum and Aonia Terra, and south of Argyre Planitia into Noachis Terra; (3) a fainter scarp extending in a long line extending from Valles Marineris through Noachis Terra, Terra Sabaea, and Syrtis Major Planum into Isidis Planitia; and (4) detection of lines of craters, possibly secondary craters. Regional names are mapped for abstract readers at https://home.csulb.edu/~rodrigue/mars/regions/</p>
Keywords: Mars, visualization, megageomorphology
Authors:
Christine M Rodrigue, Department of Geography, California State University, Long Beach; Submitting Author / Primary Presenter
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New insights from old software: Gridview brings out hidden tectonic features of Mars
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