Just add these lines to the terrain.txt in ..\ctp2_data\default\gamdata\ folder:

TERRAIN_SPECIAL3 {
TilesetIndex 27
Icon ICON_TERRAIN_DESERTS
InternalType: Special
CanDie
GLHidden

EnvBase {
Score 10
Food 0
Shield 0
Gold 5
Defense 0
Movement 200
Freight 100
DeadFood 0
DeadShield 0
DeadGold 0
}

EnvCity {
Score 0
Food 10
Shield 15
Gold 15
Movement 50
Freight 50
}

EnvRiver {
Score 30
Food 5
Shield 5
Gold 5
Movement 50
Freight 50
}

MovementType: Air
MovementType: Land
}

############################################################

Than you can screencapture the city graphics.
It easy to separate them from pure black terrain. And there is no need to resize them they have the correct size. Just put the screenshots into an sprite file but do not foreget the shadows. If you want to make red diamond sprites foreget the images in Apolyton database. Harlan gave us only the city graphics of CTP1 and his own graphics for castle and pyramid style but he foregot graphics for the industrial age.

-Martin