TNG exports LAT/LONG in separate _PLAC tags that are not associated with events. Key is the place name itself.
1 BIRT
2 DATE bet 1746 and 1747
2 PLAC Mehring
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0 _PLAC Mehring
1 MAP
2 LATI 49.7971999
2 LONG 6.8237034
2 ZOOM 11
2 PLEV 3
What exacly expects WikiTree?