Wikipedia can be a good start (for countries or region specific especially, full earth maybe less)

How do you prep those maps for the map editor?

Found this guide but those maps have far more than 16 levels (and are practically continuous). Do you somehow condense these maps into fewer elevation categories?

moke93 wrote:

How do you prep those maps for the map editor?

Found this guide but those maps have far more than 16 levels (and are practically continuous). Do you somehow condense these maps into fewer elevation categories?

Havent used these yet, but you can take the levels that are important enough and put them in a custom color palette

Is there some form of tutorial available on how to use the in-game map editor ?

There is this official tutorial as mentioned by moke93

https://humankind.mod.io/guides/map-editor-manual

You can see it in use here https://www.youtube.com/watch?v=Q0_C_gPYF_U

The map editor got soem upgrades in the steam beta patch if you opt in for it (not yet on other platforms) thats makes it a bit easy and fix some issues