已知地形的木卫三的比例为六千万分之一

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.