[postgis-users] problem with st_makevalid and (LineString)

Sat May 17 05:47:17 PDT 2014

"Rémi Cura" <remi.cura at gmail.com> escribió:

> Hm,
>
> you have a table with polygons.
> Obviously some of the polygons are not valid.
> So when you correct some of the polygon, they are transformed to line (my
> guess : some of the polygons are wihtout surface, for instance POLYGON((0 0
> , 1 1 , 0 0 )) ).
> Now when trying to insert line into polygon column, postgres complains.
>
>
> You can do 2 things :
> _solve the postgres error, this imply to be sure to update with polygons
> _solve the geometry problem, this imply to look a bit into your data to
> understand why you have invalid polygon in the first place ..;
>
>
>
> The query I gave you is going to show the invalid polygon and why they are
> invalid (solving 2.).
> If you just don't care, you can update only when the result is a
> polygon.(this querry is suboptimal)
>
> UPDATE ft_potencial SETthe_geom=ST_MakeValid(the_geom)
> WHERE GeometryType(ST_MakeValid(the_geom) ) ILIKE '%POLYGON%';
>
> Cheers,
> Remi-C
What you're doing is ignoring the lines.
But that does not bring problems in the future?
>
>
>
>
> 2014-05-16 23:58 GMT+02:00 <islanis at infomed.sld.cu>:
>
>> "Rémi Cura" <remi.cura at gmail.com> escribió:
>>
>> Remi i dont understand what do you mean here,
>>
>>  You can try to analyze a bit to understand better
>>> (for the following I consider your table doesn't contains too much data)
>>>
>>> with the_data AS (
>>> SELECT the_geom, ST_ISValid(the_geom) AS is_valid,
>>> ST_IsValidReason(the_geom)
>>> FROM ft_potencial
>>> )
>>> SELECT *, ST_AsText(ST_MakeValid(the_geom)) AS corrected_geom,
>>> ST_AsText(the_geom) AS original_geometry, detail.*
>>> FROM the_data, *ST_IsValidDetail*(the_geom) AS detail
>>>
>>> WHERE is_valid = false
>>> AND GeometryType(the_geom) ILIKE '%POLYGON%'
>>>
>>>  My guess : you have an invalid no-area polygon, so the makevalid function
>>> transform it into a line
>>>
>>
>>  ok, but like i say above, i dont understan, please be more specific,
>> please, but thanks
>>
>>
>>
>>> Cheers,
>>> Rémi-C
>>>
>>>
>>> 2014-05-16 18:14 GMT+02:00 <islanis at infomed.sld.cu>:
>>>
>>>
>>>>
>>>> "Ivan Santiago" <isantiago at ogp.pr.gov> escribió:
>>>>
>>>>
>>>>  Hello:
>>>>
>>>>>
>>>>> Run
>>>>> SELECT PostGIS_full_version();
>>>>> TO know if your installation has GEOS 3.3.0 or above.
>>>>>
>>>>>  I get this
>>>>
>>>>
>>>> "POSTGIS="2.0.0 r9605" GEOS="3.3.3-CAPI-1.7.4" PROJ="Rel. 4.8.0, 6 March
>>>> 2012" GDAL="GDAL 1.9.0, released 2011/12/29" LIBXML="2.7.8"
>>>> LIBJSON="UNKNOWN" TOPOLOGY RASTER"
>>>>
>>>>
>>>>
>>>>
>>>>  ---------------------------
>>>>> Iván Santiago
>>>>> GIS Specialist
>>>>> Information Technologies
>>>>> Office of Management and Budget
>>>>> 787.725.9420 x 2378
>>>>> Calle Cruz 254
>>>>> PO Box 9023228
>>>>> San Juan, PR 00902-3228
>>>>> http://gis.pr.gov
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: postgis-users-bounces at lists.osgeo.org [mailto:
>>>>> postgis-users-bounces at lists.osgeo.org] On Behalf Of
>>>>> islanis at infomed.sld.cu
>>>>> Sent: Friday, May 16, 2014 11:24 AM
>>>>> To: postgis-users at lists.osgeo.org
>>>>> Subject: [postgis-users] problem with st_makevalid and (LineString)
>>>>>
>>>>> Hello people, i got a problem where i have no idea what can i do.
>>>>>
>>>>> I have this table
>>>>>
>>>>> CREATE TABLE ft_potencial
>>>>> (
>>>>>    id_dw_ft_potencial integer NOT NULL,
>>>>>    id_dw_tipo integer NOT NULL,
>>>>>    id_dw_mes integer NOT NULL,
>>>>>    id_dw_municipio integer NOT NULL,
>>>>>    id_dw_date integer NOT NULL,
>>>>>    potencial real NOT NULL,
>>>>>    area real NOT NULL,
>>>>>    the_geom geometry(Polygon,4326),
>>>>>    CONSTRAINT ft_potencial_pkey PRIMARY KEY (id_dw_ft_potencial,
>>>>> id_dw_tipo, id_dw_mes, id_dw_municipio, id_dw_date)
>>>>> )
>>>>> WITH (
>>>>>    OIDS=FALSE
>>>>> );
>>>>>
>>>>> and i want to clean  the errors that it has using the function
>>>>> ST_MakeValid in this way
>>>>>
>>>>> update ft_potencial set the_geom=ST_MakeValid(the_geom);
>>>>>
>>>>> but it always return this error
>>>>>
>>>>> ERROR:  Geometry type (LineString) does not match column type (Polygon)
>>>>>
>>>>> ********** Error **********
>>>>>
>>>>> ERROR: Geometry type (LineString) does not match column type (Polygon)
>>>>> Estado SQL:22023
>>>>>
>>>>>
>>>>> what can i do to fix or clean the geometry without problems.
>>>>>
>>>>> please help.
>>>>> thanks
>>>>>
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>>>>
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>>
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>> Este mensaje le ha llegado mediante el servicio de correo electronico que
>> ofrece Infomed para respaldar el cumplimiento de las misiones del Sistema
>> Nacional de Salud. La persona que envia este correo asume el compromiso de
>> usar el servicio a tales fines y cumplir con las regulaciones establecidas
>>
>> Infomed: http://www.sld.cu/
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