Thanks for your replies.

Geowolf: I see..logically I can understand how "getFirstCoordinate()" might
be a source of this kind of trouble for polygons, since this kind of layer
has shared borders.

However it applies to certain points of an address layer. For instance 
https://karta.eskilstuna.se/geoserver/wms?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=sokvyx_adresser_adresser&LAYERS=sokvyx_adresser_adresser&TILED=true&INFO_FORMAT=text%2Fhtml&feature_count=12&X=116&Y=335&WIDTH=512&HEIGHT=512&SRS=EPSG%3A3010&STYLES=&BBOX=151339.19999999972%2C6583086%2C152772.79999999973%2C6584519.6
is the result of an URL- construction with a getFeatureInfoUrl that has the
point's real coordinates i.e the point we can pretend we
getFeatureInfo-clicked.

It will return three addresses where the first one's point is 22 meters away
from the above point.

So I was wondering whether the above call generates a pretty generous buffer
or if something else is amiss.

Regards,
David





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