[postgis-users] how obtain the interior parcels

[Fsalas]

Thanks , Fred.

Yes, I need the list of island polygons i use the ST_NumInteriorRings(), ... 
but only obtain the number , and i need obtain the list of feature island.

How resolve this?

regards , salas

 


-----Original Message-----
From: Fred Lehodey <lehodey at gmail.com>
To: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
Date: Thu, 10 Dec 2009 19:48:17 +0000
Subject: Re: [postgis-users] how obtain the interior parcels

Hi Salas,
are "interior parcels" islands ?

ST_NumInteriorRings(geometry)
Return the number of interior rings of the first polygon in the geometry. 
Return NULL if there is no polygon in the geometry.
ST_NumInteriorRing(geometry)
Synonym to NumInteriorRings(geometry). The OpenGIS specs are ambiguous about 
the exact function naming, so we provide both spellings.
ST_InteriorRingN(geometry,integer)
Return the N'th interior ring of the polygon geometry. Return NULL if the 
geometry is not a polygon or the given N is out of range.


Fred.



On Thu, Dec 10, 2009 at 7:35 PM, Fsalas <fsalas at geocuba.cu> wrote:

Hi, 
I have a table parcels , and I need obtain the list of the only interior 
parcels, the parcels is not overlap.
I test ST_Contains(), ST_Intersects() but the result is not correct.
 
Salas.

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