[postgis-users] Removing tiny polygons

Astrid Bjørnerød aeb at skogoglandskap.no
Mon Jan 27 22:18:56 PST 2014


Is there anyone you have written some sql-code for removing the small polygons onto one of the neighbor-polygons ?
Any stabil functions for this task?

Astrid

-----Opprinnelig melding-----
Fra: postgis-users-bounces at lists.osgeo.org [mailto:postgis-users-bounces at lists.osgeo.org] På vegne av Tom McCallum
Sendt: 27. januar 2014 20:48
Til: morten at sickel.net; PostGIS Users Discussion
Emne: Re: [postgis-users] Removing tiny polygons

Thanks Morten.  I wanted the first case, so that helps.

On Mon, 27 Jan 2014 19:15:18 -0000, Morten Sickel <morten at sickel.net>
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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