Ok, really silly question now, how can a polygon field contain what looks
like multiple polygons.
So I have a Shapefile of GB but its only got 3 polygons in, according to
PostGis, but there are lots of small island polygons as well which are not
attached to any of the main land masses, so I don't see how they can all
be one polygon? Can a polygon field have multiple polygons in without
being a multi-polygon?
Thanks
On Mon, 27 Jan 2014 19:15:18 -0000, Morten Sickel <[email protected]>
wrote:
It depends on what you mean with "remove" - do you want to just have the
large polygons without the area that is covered by the small ones or do
you want to add the area of the small polygons onto one or more of the
larges? (e.g. how one typically wants to handle shiver polygons)
In the first case it is as easy as a query like
select the_geom where ST_area(the_geom) > ...
Morten
Tom McCallum skrev:
Hi all,
If I have a polygon geometry field which seems to be made up of a large
number of tiny polygons and some larger ones, what is the best way to
remove polygons below a certain size? Would I need to preprocess this
and
save in a new table/record or can I dynamically do it?
Thanks
Tom
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