I decided to test what affects city tile shield production, to figure out why some city centers produce more shields than others. Here's what I found.
Shields from unimproved terrain
+Shields from bonus resources
+1 if city size >= 7
+1 if industrious and size >= 7
+1 if city size >= 13
+1 if shields==0 so far
+1 if in golden age/mobilization
The interesting part is you only get the 0-shield-terrain bonus if the city is size 6 or less. Building on shielded grassland is not any worse than building on regular grassland after you reach size 7!
Shields from unimproved terrain
+Shields from bonus resources
+1 if city size >= 7
+1 if industrious and size >= 7
+1 if city size >= 13
+1 if shields==0 so far
+1 if in golden age/mobilization
The interesting part is you only get the 0-shield-terrain bonus if the city is size 6 or less. Building on shielded grassland is not any worse than building on regular grassland after you reach size 7!
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