Hi Mitxel,
I think I split up your mails into several topics, else it will get quite a
chaos to follow up all these ideas.
If you have a layer of raster maps reading the files and scaling the content to
an upper zoomlevel is
getting more and more resource intensive the more you zoom out. To avoid
endless map loading,
QMS will skip the map if the effort to display it is getting too large.
However if QMS detects overview levels attached to the map it will use them.
gdaladdo is the tool to
do so. Things are getting a bit more difficult for insane large map
collections. gdaladdo will create an
overview file over all maps combined in the vrt. That might get too large. In
this case you have to
create single overview files and combine them in a vrt.
HTH
Oliver
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