[postgis-users] problem with st_makevalid and (LineString)
islanis at infomed.sld.cu
islanis at infomed.sld.cu
Sat May 17 07:20:59 PDT 2014
islanis at infomed.sld.cu escribió:
> "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?
I found this function, but do not know if it is recommended use it to
correct the problems of geometry. I mean cleangeometry
CREATE OR REPLACE FUNCTION cleanGeometry(geom geometry)
RETURNS geometry AS
$BODY$DECLARE
inGeom ALIAS for $1;
outGeom geometry;
tmpLinestring geometry;
Begin
outGeom := NULL;
-- Clean Process for Polygon
IF (GeometryType(inGeom) = 'POLYGON' OR GeometryType(inGeom) =
'MULTIPOLYGON') THEN
-- Only process if geometry is not valid,
-- otherwise put out without change
if not st_isValid(inGeom) THEN
-- create nodes at all self-intersecting lines by union the polygon boundaries
-- with the startingpoint of the boundary.
tmpLinestring :=
st_union(st_multi(st_boundary(inGeom)),st_pointn(st_boundary(inGeom),1));
outGeom = st_buildarea(tmpLinestring);
IF (GeometryType(inGeom) = 'MULTIPOLYGON') THEN
RETURN st_multi(outGeom);
ELSE
RETURN outGeom;
END IF;
else
RETURN inGeom;
END IF;
------------------------------------------------------------------------------
-- Clean Process for LINESTRINGS, self-intersecting parts of linestrings
-- will be divided into multiparts of the mentioned linestring
------------------------------------------------------------------------------
ELSIF (GeometryType(inGeom) = 'LINESTRING') THEN
-- create nodes at all self-intersecting lines by union the linestrings
-- with the startingpoint of the linestring.
outGeom := st_union(st_multi(inGeom),st_pointn(inGeom,1));
RETURN outGeom;
ELSIF (GeometryType(inGeom) = 'MULTILINESTRING') THEN
outGeom := multi(st_union(st_multi(inGeom),st_pointn(inGeom,1)));
RETURN outGeom;
ELSE
RAISE NOTICE 'The input type % is not supported',GeometryType(inGeom);
RETURN inGeom;
END IF;
End;$BODY$
LANGUAGE 'plpgsql' VOLATILE;
>>
>>
>>
>>
>> 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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>>>>>>
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>>>>>>
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>>>>>
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>
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