Tundra, snow and desert have about 1 resource per 10 tiles, while grassland and plains are about 1 per 40 tiles. It's a rough approximation of some complicated resource/start location placement code and depends on features, but that's about the base values.
Being resource-poor is not a bad thing though, since grassland and plans are yield-rich.
Our choices are (these are mutually exclusive categories): ocean, river, terrain, avoid terrain. Here are the current settings, I've highlighted some thoughts of stuff to add in bold:
- America -
- Arabia - desert
- Aztecs - jungle
- Babylon - desert
- China -
- Egypt - avoid forest, avoid jungle
- England - ocean
- France -
- Germany - avoid ocean?
- Greece - avoid hills? avoid desert?
- Incas - hills (I suspect)
- India - grassland
- Iroquois - forest
- Japan -
- Mongolia - plains
- Ottomans - avoid tundra
- Persia -
- Rome - hills?
- Russia - tundra
- Siam - avoid forest
- Songhai - avoid tundra
- Spain - not sure
Some of the suggestions are considerations based on the civilization's traits, which would help reduce frustrating games where the traits are nearly unusable:
- Germany's trait relies on having access to lots of barbarian camps, which is unlikely if starting on a peninsula.
- Greece's CC requires horses but they don't favor terrain where horses are frequent.
- Rome is an iron unit but without a rough terrain priority (where iron is frequent).