This model is based on the global digital elevation map (DEM) of the MIIGAiK Extraterrestrial Laboratory (MExLab) Geoportal site and the two biggest patchs of topography from the work of Zubarev et al. 2017, which are near the poles. It was rendered using MATLAB R2016a. Many features may be artifacts caused by the mixing of the two different sources.
The file's names explained: name_1_x_10_y.stl is 1 : x * 10y. So _1_6_10_7 is 1:600000000 or one in 60 million.
Zubarev, A., Nadejdina, I., Brusnikin, E., Giese, B., Oberst, J., A search for
Ganymede stereo images and 3D mapping opportunities, Planetary and Space Science (2017), doi: 10.1016/j.pss.2017.07.021.
Ganymede is the largest moon of Jupiter as well as of the Solar System. It's sometime called a "planet like moon", being larger in diameter than Mercury, but having a 45% of the planet mass. This is because it's largelly composed of water ice, being the largest "icy body" (aka. an object composed of a great fraction of water, with a solid surface). Water is one of the least viscous material of celestial bodies. That's why objects with ice composition can be rounded at smaller size, like Mimas; or bigger objects like Ganymede can be extremelly rounded, because when a moon or an asteroid melts (usually in its early history) it turns into a rouded shape, and a less vicous material could easily flow to fill the irregular terrain. Ganymede has a fully differenciated nucleus, rich in iron, which makes it the only moon with a substantial magnetic field. Its surface has two main types of geography: one old, dark, heavily cratered, similar to that of Callisto, and a younger, lighter and grooved terrain. However, this difference is not visible because of the low resolution of the topographical maps. Io, Europa and Ganymede are locked in a 1:2:4 orbit resonance, which means that each Ganymede's orbit around Jupiter, Europa makes 2, and Io makes 4.
Orbital period: 7.154 d
Composition: Icy body. Differenciated interior. Subsurface ocean.
Density: 1.936 g/cm3.
Dimensions: 5268.2 km
Model scale: 1:6x107 (9cm)