Planetary science questions are generally on-topic both here and in Space Exploration SE.
The recent and rapidly answered question How can I find the depth of a portion of the Valles Marineris? includes the figure below, and the mapping and characterization of this kind of geographic data on rocky planets is done with spacecraft in orbit around the planet.
There are many well-answered questions in SpaceSE about specific geographic features on rocky planets. While not a priori off topic, I'm wondering if we should try to keep this class of questions in one site (i.e. Space SE).
This allows for linking related questions, which we can not do across different sites (currently).
This might include by extension radar mapping from Earth of the rocky planets as well, for which most of the questions are also in Space SE.