Hi,
I started to reduse the number of polygons in one dataset which originally it
contained more than 5000 rahter complicated polygons. Some experience:
- "Combine two selected polygons tool" is fast but it has a little bug. It
allows to combine polygons even if the layer is non-editable.
- "Combine polygon with neighbouring polygon" is very slow and can give an
out-of-memory error. Is it perhaps walking through all the features when
searching for the one to use for combining? I would guess that it should be
much faster if it correctly selects just the few adjacent polygons for
candidates first.
- Making union of selected features suits me well because I would like to
combine about 10-20 polygons together. However, because it creates new layer
each time there is some extra work with joining them together later.
- "Union selected in place (if result can be simple polygon)" would be the
ideal tool for just this case.
-Jukka Rahkonen-
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