Factorio Forums

I've seen that there are several mods that adjust how the map generates (i.e., it can generate rivers & stuff). How would I go about making a mod that would create 'true' continents, archipelagos, & other sort of quasi-natural features? Both from the 'syntax' of "how do I make it in Factorio?" and the semantics of "how would I create logic within the Factorio system that would generate those kind of terrain patterns?"

In the https://mods.factorio.com/mod/NewIslands I use math.cos multiple times, every with another period and rotation.