Anyone use ESRI products like ArcGIS or ArcScene? Obviously not intended for use in fictional maps, and expensive with something of a learning curve. I'm mainly looking at using them because 1. I'm strudying it for real-world uses anyway and 2. it's highly robust ability to store data geographically. I.e. you could select everywhere with an altitude under X and create an ocean feature to cover it. It also has tools for calculating watersheds and such to model very realistic rivers from a set of elevation values. Overkill for most purposes I'm sure. Hopefully I'll one day have my Mars map at least partially created with Arcmap to show here.