[postgis-users] Point inside a polygon (?smund Tokheim)

[Stephen Davies]

Why not ST_contains?

On 04/05/14 04:30, postgis-users-request at lists.osgeo.org wrote:
> Message: 1
> Date: Fri, 2 May 2014 21:38:31 +0200
> From: ?smund Tokheim <asmundto at gmail.com>
> To: PostGIS Users Discussion <postgis-users at lists.osgeo.org>
> Subject: Re: [postgis-users] Point inside a polygon
> Message-ID:
> 	<CAFDjuaBA8pxXZoV2zgkr0LiphmX7MNgvkka1Rhf1Wt=YeQ+oug at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi
>
> You can use st_closestpoint(geom, st_centroid(geom)) to make sure that the
> returned point is in most circumstances at or near the centroid, and always
> at least on the boundary of the polygon. While st_pointonsurface certainly
> will be faster, it will often choose a more random point on the surface.
>
> ?smund
>
>
> On Fri, May 2, 2014 at 12:45 PM, Nicolas Ribot <nicolas.ribot at gmail.com>wrote:
>
>> Hi,
>>
>> Use st_pointOnSurface (
>> http://postgis.net/docs/manual-2.1/ST_PointOnSurface.html)
>>
>> Nicolas
>>
>>
>> On 2 May 2014 06:32, J.Alejandro Martinez Linares <islanis at infomed.sld.cu>wrote:
>>
>>> Hi people, i need your help, i was using st_centroid to get a point that
>>> be inside a polygon butr st_centroid got a property  that is a problem to
>>> me, it returns a point that not always is inside the polygon, cause when
>>> the polygon has an irregular form, the point that st_centroid is outside
>>> the polygon, and i need a function that do a similar thing that st_centroid
>>> but i need that the point it returns always be inside the polygon, is there
>>> a function that do that?
>>>
>>> cheers.
>>>
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