![]() ![]() ![]() Gaps in the DEM represent masked noise or absence of stereo coverage. Image 1: Global stereo DEM overlain on a mosaic of Voyager and Galileo images in simple cylindrical projection at 2 km/pixel. While not providing coverage across the entire globe, the map stands as the most comprehensive continuous topographic data set of Io’s surface, at least until a spacecraft arrives at Io with a dedicated photogrammetric camera or a laser altimeter on board. This map represents a continuous topographic dataset that has revealed topographic variations not otherwise apparent in Voyager and Galileo imaging and limb profiles, and which may be correlated with geologic units (e.g. (2014) constructed a global digital elevation model (DEM) covering ~75% of Io’s surface from all available stereo coverage in Voyager and Galileo imaging, and controlled it using Galileo limb profiles (Image 1). No instrumentation specifically designed to measure topography has ever been deployed to Io, but White et al. Constant volcanic resurfacing means that the oldest surface is likely not more than a million years old (Williams et al., 2011). Io is the innermost Galilean satellite of Jupiter, and with over 400 active volcanoes, it is the most volcanically active body in the Solar System, a consequence of tidal heating from friction generated within its interior as it is pulled between Jupiter and other Galilean satellites. Post contributed by Oliver White, Search for Extraterrestial Intelligence Institute. Geomorphic Processes Aeolian avalanches Banded Terrain Blockfall Boulder Chaos Chaotic Terrain Charon Climate Craters Cryo-venting Cryo-Volcanic Cryovolcanism Debris flow Delta deltaic desert Dragongly Dry lake Dune dunes Earth Europa Evaporite ExoMars Fan Fluvial Fracture fills geochemical Glacial Glacier Granular Flow Groundwater Haulani Ice Impact cratering Impact shaking Inverted topography Karst Laboratory Experiment Labyrinth Lacustrine Lake Landslide Lava flows Marine Mars Mass Movement Mass wasting Melting Mineralogy Miranda Ocean Periglacial Pingo Pit Pluto Regolith Rock Breakdown RSL Sedimentary Soil Spring Mound Sputnik Planitia Stratigraphy Tectonic tectonics Titan Topography Valley volatiles Volcanic volcanism Weathering Yardang.Field Guide to an Ancient Martian Lake Bed.Ice mounds on Mars are a vault of the planet’s climate history.Surface expressions of ice flow on Earth and Mars.Flow deposits on Mercury – Impact ejecta flows or landslides?. ![]()
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