<div dir="ltr">You can use ST_IsValid() to know if it is "valid" for postgres.<div>Even best, you can try to see what it looks like in qgis.</div><div><br></div><div>Cheers,</div><div>Rémi-C</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">2014/1/15 Ludovic Granjon <span dir="ltr"><<a href="mailto:ludovic.granjon@u-bourgogne.fr" target="_blank">ludovic.granjon@u-bourgogne.fr</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Hello<br>
<br>
I think, I can do<br>
SELECT st_geometryN(geom,1) FROM ec;<br>
without error<br>
<br>
I get<br>
<br>
"POLYGON((504935.641400002 2310827.805,504952.193899997
2310825.6349,504964.4124 2310824.033,504964.191799998
2310823.56,504964.037199996 2310822.9832,504963.987400003
2310822.5117,504948.949900001 2310822.7941,504940.407399997
2310823.3589,504932.090300001 2310824.5769,504931.797399998
2310824.7718,504931.360100001 2310824.9757,504930.894100003
2310825.1006,504930.735399999 2310825.1239,504929.7368
2310825.2555,504929.7368 2310825.8138,504929.847599998
2310828.5646,504935.641400002 2310827.805))"<br>
<br>
Thanks<br>
<br>
Ludovic<br>
<br>
<br>
<br>
Le 15/01/2014 10:47, Christophe Vergon a écrit :<br>
</div><div><div class="h5">
<blockquote type="cite">
<div>Hello,<br>
<br>
Is st_geometryN(r.geomp,1) a valid geometry ?<br>
<br>
<br>
<br>
Ludovic Granjon a écrit :<br>
</div>
<blockquote type="cite">
<div>Hello (Bonjour Christophe)<br>
<br>
I don't use french cadastre, only specific archaelogical data.<br>
<br>
Thanks for this, I try but, I don't realy understand how
worked topogeo_addpolygon.<br>
If I do :<br>
<br>
CREATE EXTENSION postgis;<br>
CREATE EXTENSION postgis_topology;<br>
SET search_path = topology,public;<br>
<br>
I import my layer with QGIS<br>
<br>
SELECT topology.CreateTopology('ec_topo', 27572);<br>
SELECT
topology.AddTopoGeometryColumn('ec_topo','public','ec','topo_geom','POLYGON');<br>
<br>
DO $$DECLARE r record;<br>
BEGIN<br>
FOR r IN SELECT * FROM ec LOOP<br>
BEGIN<br>
SELECT
topology.TopoGeo_AddPolygon('ec_topo',st_geometryn(r.geom,1),1);<br>
EXCEPTION<br>
WHEN OTHERS THEN<br>
RAISE WARNING 'Loading of record % failed: %', <a href="http://r.id" target="_blank">r.id</a>,
SQLERRM;<br>
END;<br>
END LOOP;<br>
END$$;<br>
<br>
I have :<br>
ATTENTION: Loading of record 1 failed: la requête n'a pas de
destination pour les données résultantes<br>
<br>
I don't know where I'm wrong<br>
<br>
If you have an idea<br>
<br>
Thanks<br>
<br>
Regards<br>
<br>
Ludovic<br>
<br>
PS : (si j'avais sur que c'était toi qui répondrait, j'aurai
écrit sur nos forums francophone ;-) )<br>
<br>
Le 15/01/2014 08:25, Christophe Vergon a écrit :<br>
</div>
<blockquote type="cite">Hello,
(bonjour) <br>
<br>
When you udpdate a topology by using a SET statement if a
polygon intersect an other you will have this error. <br>
If you want to create a topology from polygons try to use the
topogeo_addpolygon function, the intersection between two
polygons will be a new face. <br>
<br>
If, as I mean, you use a french survey "cadastre" data set,
it's the best way to do that. <br>
<br>
<br>
<br>
Ludovic Granjon a écrit : <br>
<blockquote type="cite">Hi all <br>
<br>
I try to import a polygon layer to postgis and build
topology with tolerance. <br>
I try something like that <br>
<br>
SELECT CreateTopology('ec_topo2', 27572); <br>
SELECT AddTopoGeometryColumn('ec_topo2', 'public', 'ec',
'topogeom2', 'MULTIPOLYGON'); <br>
UPDATE ec SET topogeom2 = toTopoGeom(geom, 'ec_topo', 1,
1.0); <br>
<br>
But when I do that, I have <br>
<br>
********** Erreur ********** <br>
<br>
ERREUR: Spatial exception - geometry intersects edge 262 <br>
État SQL :P0001 <br>
Contexte : fonction PL/pgsql « topogeo_addlinestring »,
ligne 124 à affectation <br>
SQL statement "SELECT array_cat(edges, array_agg(x)) FROM (
select topology.TopoGeo_addLinestring(atopology, rec.geom,
tol) as x ) as foo" <br>
fonction PL/pgsql « topogeo_addpolygon », ligne 24 à
affectation <br>
fonction PL/pgsql « totopogeom », ligne 112 à FOR sur des
lignes de SELECT <br>
fonction PL/pgsql « totopogeom », ligne 94 à affectation <br>
<br>
I try to modify the tolerance parameter but it still doesn't
work <br>
<br>
Have you a solution for that ? <br>
<br>
Thanks a lot <br>
<br>
Regards <br>
<br>
Ludovic <br>
<br>
<br>
<br>
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