<div dir="ltr"><div><div><div>Hey,<br></div>I gave you the 2 queries that eitehr inspect your data or insert only polygon into your column.<br></div><br></div><div>As said previously, there is no "magic function".<br>
</div><div><br>Cheers,<br></div>Rémi-C<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-05-17 19:01 GMT+02:00 Åsmund Tokheim <span dir="ltr"><<a href="mailto:asmundto@gmail.com" target="_blank">asmundto@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi<div><br></div><div>Use something like</div><div><br></div><div>SELECT st_astext(the_geom), st_astext(st_makevalid(the_geom))</div>
<div>FROM ft_potencial</div><div>WHERE st_geometrytype(st_makevalid(the_geom)) NOT ilike 'st_polygon'</div>
<div><br></div><div>to inspect the rows that caused the initial errors. You can also use the WHERE-part in qgis, or in a DELETE statement to drop the rows (but please try the select statement first).</div><span class="HOEnZb"><font color="#888888"><div>
<br></div><div>
Åsmund</div></font></span><div><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, May 17, 2014 at 6:52 PM, <span dir="ltr"><<a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">"Ivan Santiago" <<a href="mailto:isantiago@ogp.pr.gov" target="_blank">isantiago@ogp.pr.gov</a>> escribió:<br>
<div>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Hello there.<br>
I know this forum is about postgis but sometimes you can use another open source solutions.<br>
You can use QGiS or even better GRASS to clean topological errors.<br>
Sometimes graphic tools work better for this kind of problems...<br>
</blockquote></div>
but the table ft_potencial is big, please how can i do it with qgis or grass, have you the steps without it render the entire layer, because i repeat , tha layer is big, i have qgis v1.8.0.<br>
<br>
thanks<div><div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<br>
Sent from my Windows Phone<br>
______________________________<u></u>__<br>
From: <a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a><br>
Sent: 5/17/2014 12:12<br>
To: <a href="mailto:postgis-users@lists.osgeo.org" target="_blank">postgis-users@lists.osgeo.org</a><br>
Subject: Re: [postgis-users] problem with st_makevalid and (LineString)<br>
<br>
"Åsmund Tokheim" <<a href="mailto:asmundto@gmail.com" target="_blank">asmundto@gmail.com</a>> escribió:<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Hi<br>
<br>
I don't think that you can expect the st_makevalid function to correct the<br>
underlying problem with your data. As Rèmi said, some geometries in your<br>
original table might have incorrectly been labeled as polygons when the<br>
coordinates suggests that they are linestrings. In my eyes, the most<br>
correct solution would be to remove the Polygon-constraint on the data. In<br>
some applications it might be better to use st_buffer to generate a small<br>
polygon around those linestrings, or even more simply discard those rows.<br>
You have to use your knowledge of the application and the source of the<br>
data to decide how these geometries should best be handled. Inspecting the<br>
geometries that are turned into linestrings might aid you in finding a good<br>
solution.<br>
<br>
As for the cleanGeometry function, I'm not familiar with it, but it seems<br>
to me like the aforementioned line-polygons would be turned into<br>
null-values by the st_buildarea function. So just like st_makevalid, it<br>
isn't a one-liner you can use to make all your problems go away.<br>
<br>
Åsmund<br>
</blockquote>
well, I need help because I'm not very good at this in the querys,<br>
following the first advice I'd like eliminate tuples than are not<br>
polygons and find and delete the tuples that have null-values, how can<br>
i do that?<br>
<br>
thanks<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<br>
<br>
On Sat, May 17, 2014 at 4:20 PM, <<a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a>> wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a> escribió:<br>
<br>
<br>
"Rémi Cura" <<a href="mailto:remi.cura@gmail.com" target="_blank">remi.cura@gmail.com</a>> escribió:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<br>
Hm,<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<br>
you have a table with polygons.<br>
Obviously some of the polygons are not valid.<br>
So when you correct some of the polygon, they are transformed to line (my<br>
guess : some of the polygons are wihtout surface, for instance<br>
POLYGON((0 0<br>
, 1 1 , 0 0 )) ).<br>
Now when trying to insert line into polygon column, postgres complains.<br>
<br>
<br>
You can do 2 things :<br>
_solve the postgres error, this imply to be sure to update with polygons<br>
_solve the geometry problem, this imply to look a bit into your data to<br>
understand why you have invalid polygon in the first place ..;<br>
<br>
<br>
<br>
The query I gave you is going to show the invalid polygon and why they<br>
are<br>
invalid (solving 2.).<br>
If you just don't care, you can update only when the result is a<br>
polygon.(this querry is suboptimal)<br>
<br>
UPDATE ft_potencial SETthe_geom=ST_MakeValid(the_<u></u>geom)<br>
WHERE GeometryType(ST_MakeValid(the_<u></u>geom) ) ILIKE '%POLYGON%';<br>
<br>
Cheers,<br>
Remi-C<br>
<br>
</blockquote>
What you're doing is ignoring the lines.<br>
</blockquote>
But that does not bring problems in the future?<br>
<br>
I found this function, but do not know if it is recommended use it to<br>
correct the problems of geometry. I mean cleangeometry<br>
<br>
CREATE OR REPLACE FUNCTION cleanGeometry(geom geometry)<br>
RETURNS geometry AS<br>
$BODY$DECLARE<br>
inGeom ALIAS for $1;<br>
outGeom geometry;<br>
tmpLinestring geometry;<br>
<br>
Begin<br>
<br>
outGeom := NULL;<br>
<br>
-- Clean Process for Polygon<br>
IF (GeometryType(inGeom) = 'POLYGON' OR GeometryType(inGeom) =<br>
'MULTIPOLYGON') THEN<br>
<br>
-- Only process if geometry is not valid,<br>
-- otherwise put out without change<br>
if not st_isValid(inGeom) THEN<br>
<br>
-- create nodes at all self-intersecting lines by union the polygon<br>
boundaries<br>
-- with the startingpoint of the boundary.<br>
tmpLinestring := st_union(st_multi(st_boundary(<br>
inGeom)),st_pointn(st_<u></u>boundary(inGeom),1));<br>
outGeom = st_buildarea(tmpLinestring);<br>
IF (GeometryType(inGeom) = 'MULTIPOLYGON') THEN<br>
RETURN st_multi(outGeom);<br>
ELSE<br>
RETURN outGeom;<br>
END IF;<br>
else<br>
RETURN inGeom;<br>
END IF;<br>
<br>
<br>
------------------------------<u></u>------------------------------<br>
------------------<br>
-- Clean Process for LINESTRINGS, self-intersecting parts of linestrings<br>
-- will be divided into multiparts of the mentioned linestring<br>
------------------------------<u></u>------------------------------<br>
------------------<br>
ELSIF (GeometryType(inGeom) = 'LINESTRING') THEN<br>
<br>
-- create nodes at all self-intersecting lines by union the linestrings<br>
-- with the startingpoint of the linestring.<br>
outGeom := st_union(st_multi(inGeom),st_<u></u>pointn(inGeom,1));<br>
RETURN outGeom;<br>
ELSIF (GeometryType(inGeom) = 'MULTILINESTRING') THEN<br>
outGeom := multi(st_union(st_multi(<u></u>inGeom),st_pointn(inGeom,1)));<br>
RETURN outGeom;<br>
ELSE<br>
RAISE NOTICE 'The input type % is not supported',GeometryType(<u></u>inGeom);<br>
RETURN inGeom;<br>
END IF;<br>
End;$BODY$<br>
LANGUAGE 'plpgsql' VOLATILE;<br>
<br>
<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<br>
<br>
<br>
2014-05-16 23:58 GMT+02:00 <<a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a>>:<br>
<br>
"Rémi Cura" <<a href="mailto:remi.cura@gmail.com" target="_blank">remi.cura@gmail.com</a>> escribió:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<br>
Remi i dont understand what do you mean here,<br>
<br>
You can try to analyze a bit to understand better<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
(for the following I consider your table doesn't contains too much<br>
data)<br>
<br>
with the_data AS (<br>
SELECT the_geom, ST_ISValid(the_geom) AS is_valid,<br>
ST_IsValidReason(the_geom)<br>
FROM ft_potencial<br>
)<br>
SELECT *, ST_AsText(ST_MakeValid(the_<u></u>geom)) AS corrected_geom,<br>
ST_AsText(the_geom) AS original_geometry, detail.*<br>
FROM the_data, *ST_IsValidDetail*(the_geom) AS detail<br>
<br>
WHERE is_valid = false<br>
AND GeometryType(the_geom) ILIKE '%POLYGON%'<br>
<br>
My guess : you have an invalid no-area polygon, so the makevalid<br>
function<br>
transform it into a line<br>
<br>
<br>
</blockquote>
ok, but like i say above, i dont understan, please be more specific,<br>
please, but thanks<br>
<br>
<br>
<br>
Cheers,<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Rémi-C<br>
<br>
<br>
2014-05-16 18:14 GMT+02:00 <<a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a>>:<br>
<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
"Ivan Santiago" <<a href="mailto:isantiago@ogp.pr.gov" target="_blank">isantiago@ogp.pr.gov</a>> escribió:<br>
<br>
<br>
Hello:<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Run<br>
SELECT PostGIS_full_version();<br>
TO know if your installation has GEOS 3.3.0 or above.<br>
<br>
I get this<br>
<br>
</blockquote>
<br>
<br>
"POSTGIS="2.0.0 r9605" GEOS="3.3.3-CAPI-1.7.4" PROJ="Rel. 4.8.0, 6<br>
March<br>
2012" GDAL="GDAL 1.9.0, released 2011/12/29" LIBXML="2.7.8"<br>
LIBJSON="UNKNOWN" TOPOLOGY RASTER"<br>
<br>
<br>
<br>
<br>
---------------------------<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Iván Santiago<br>
GIS Specialist<br>
Information Technologies<br>
Office of Management and Budget<br>
<a href="tel:787.725.9420%20x%202378" value="+17877259420" target="_blank">787.725.9420 x 2378</a><br>
Calle Cruz 254<br>
PO Box 9023228<br>
San Juan, PR 00902-3228<br>
<a href="http://gis.pr.gov" target="_blank">http://gis.pr.gov</a><br>
<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:postgis-users-bounces@lists.osgeo.org" target="_blank">postgis-users-bounces@lists.<u></u>osgeo.org</a> [mailto:<br>
<a href="mailto:postgis-users-bounces@lists.osgeo.org" target="_blank">postgis-users-bounces@lists.<u></u>osgeo.org</a>] On Behalf Of<br>
<a href="mailto:islanis@infomed.sld.cu" target="_blank">islanis@infomed.sld.cu</a><br>
Sent: Friday, May 16, 2014 11:24 AM<br>
To: <a href="mailto:postgis-users@lists.osgeo.org" target="_blank">postgis-users@lists.osgeo.org</a><br>
Subject: [postgis-users] problem with st_makevalid and (LineString)<br>
<br>
Hello people, i got a problem where i have no idea what can i do.<br>
<br>
I have this table<br>
<br>
CREATE TABLE ft_potencial<br>
(<br>
id_dw_ft_potencial integer NOT NULL,<br>
id_dw_tipo integer NOT NULL,<br>
id_dw_mes integer NOT NULL,<br>
id_dw_municipio integer NOT NULL,<br>
id_dw_date integer NOT NULL,<br>
potencial real NOT NULL,<br>
area real NOT NULL,<br>
the_geom geometry(Polygon,4326),<br>
CONSTRAINT ft_potencial_pkey PRIMARY KEY (id_dw_ft_potencial,<br>
id_dw_tipo, id_dw_mes, id_dw_municipio, id_dw_date)<br>
)<br>
WITH (<br>
OIDS=FALSE<br>
);<br>
<br>
and i want to clean the errors that it has using the function<br>
ST_MakeValid in this way<br>
<br>
update ft_potencial set the_geom=ST_MakeValid(the_<u></u>geom);<br>
<br>
but it always return this error<br>
<br>
ERROR: Geometry type (LineString) does not match column type<br>
(Polygon)<br>
<br>
********** Error **********<br>
<br>
ERROR: Geometry type (LineString) does not match column type<br>
(Polygon)<br>
Estado SQL:22023<br>
<br>
<br>
what can i do to fix or clean the geometry without problems.<br>
<br>
please help.<br>
thanks<br>
<br>
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