going crazy...
same filter applied and when I look, some squares are clearer than others. I'm reworking it one by one... compare, correct, re-compare, when it look ok, move to the next...
and for cities it's almost the same, except that they apear differently when displayed (a big patch over landscape), so they need to be smoothen out more (not found it right 'till now)
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coolaero.altajeux.com