Over the past couple of days I've been implementing a system which utilises Climates and Terrain to determine which trade good to be placed in a province. It still needs a bit more work but I've implemented a couple of new mapmodes to show the diversity of the terrain and climate.
For climates: blue-green is oceanic, Dark green is continental, Light-green is sub-tropical, yellow is mediterreanean, Orange is arid-hot, white is arid-hot and blue is polar.
For Terrains: Grey is mountains, light green is flat, dark green is forest, white is wasteland, light brown is forest hills, dark brown is hills.
Longer devlog with explinations of how to make the map coming soon (: