Follow-up Comment #13, bug #15255 (project freeciv):
> Will compile the patch now and then test some maps ...
I tested the patch and if swamps are allowed in !FROZEN terrains they look
fine for the different generators and temperature settings of 30 / 50 / 70
(swamp explanation in bug #15001).
One thing with regard to poles (map with temperature = 30; size = 5; topology
= 3):
3: map settings:
3: mountain_pct : 18%
3: desert_pct : 4%
3: forest_pct : 18%
3: jungle_pct : 0%
3: swamp_pct : 5%
3: map statistics:
3: Lake : 22 0.4% (ocean: 0.9%)
3: Ocean : 1408 28.7% (ocean: 56.1%)
3: Deep Ocean : 1079 22.0% (ocean: 43.0%)
3: Glacier : 1163 23.7% (land: 48.6%)
3: Desert : 46 0.9% (land: 1.9%)
3: Forest : 220 4.5% (land: 9.2%)
3: Grassland : 336 6.9% (land: 14.1%)
3: Hills : 139 2.8% (land: 5.8%)
3: Jungle : 4 0.1% (land: 0.2%)
3: Mountains : 83 1.7% (land: 3.5%)
3: Plains : 335 6.8% (land: 14.0%)
3: Swamp : 61 1.2% (land: 2.6%)
3: Tundra : 4 0.1% (land: 0.2%)
In the above output the map settings and the map statistic don't match. One
has to take into account that the poles (= glacier) are special and are set
after water (lake + ocean + deep ocean) but before the land tiles are
defined. One has to remove this terrain type to get the right numbers (i.e
for forest: 9.2 * 100 / (100-48.6) = 17.9). For a high temperature map
(temperature = 70; size = 5; topology = 3) it looks (kind of) OK:
3: map settings:
3: mountain_pct : 20%
3: desert_pct : 9%
3: forest_pct : 15%
3: jungle_pct : 5%
3: swamp_pct : 8%
3: map statistics:
3: Lake : 13 0.3% (ocean: 0.3%)
3: Ocean : 1052 21.5% (ocean: 28.3%)
3: Deep Ocean : 2655 54.2% (ocean: 71.4%)
3: Glacier : 0 0.0% (land: 0.0%)
3: Desert : 46 0.9% (land: 3.9%)
3: Forest : 160 3.3% (land: 13.6%)
3: Grassland : 315 6.4% (land: 26.7%)
3: Hills : 145 3.0% (land: 12.3%)
3: Jungle : 18 0.4% (land: 1.5%)
3: Mountains : 93 1.9% (land: 7.9%)
3: Plains : 308 6.3% (land: 26.1%)
3: Swamp : 95 1.9% (land: 8.1%)
3: Tundra : 0 0.0% (land: 0.0%)
This also differs for different topology settings (all generators); wrap N-S
+ wrap E-W maps (topology = 3,7,11,15) have for temperature = 30 around 23%
glacier at the poles while the other topologies have only around 11%.
(only some statistics I found while experimenting with the map settings)
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