OK, I know, it's chinese, but I thought I share it with you.
I've found Baidu maps; a map of only China. This map has a 'birdeye'-view, where you can see various cities in 'SC4'-perspective, like this:
(https://www.sc4devotion.com/forums/proxy.php?request=http%3A%2F%2Fs4.postimage.org%2F47sf6dupx%2FBaidu.jpg&hash=5403afc4ffc1bec6504e664601ea49bd43b1f843) (http://map.baidu.com/?newmap=1&l=4&tn=B_NORMAL_MAP&c=4839850,6947413&cc=&s=tpl:City&sc=0%5B/url)
Click on the image to open the site.
It's very useful for those who want to build Asian cities.
Hope you find this useful!
-Matthijs