SRID appearing in ST_AsText for particular multipolygon

[robe]

Has anyone seen this behavior before. It was breaking one of my apps. I have a PostGIS 1.5.3 on PostgreSQL 9.0 windows

I have this geometry created from a complex process, and when I do an ST_AsText on it, it gives me this:

MULTIPOLYGON(SRID=4326;((-116.9937666 33.4711291,-116.9936485 33.4698868,-116.992874 33.4689698,-116.9911977 33.4686095,-116.9889499 33.4689424,-116.9865345 33.4688388,-116.9849953 33.4684547,-116.9832575 33.4670819,-116.9818378 33.4640042,-116.9804437 33.4606503,-116.9785802 33.456815,-116.9768635 33.4544292,-116.9736925 33.451981,-116.9685215 33.4499332,-116.9640394 33.4483194,-116.9588176 33.4468239,-116.9537627 33.4456727,-116.9510672 33.4445338,-116.9474055 33.4424094,-116.9448697 33.4404641,-116.9424141 33.438173,-116.9417469 33.4367258,-116.9417363 33.4350225,-116.942846 33.4326237,-116.9443114 33.4301081,-116.9451514 33.4284701,-116.9454185 33.4273179,-116.945434 33.426743,-116.9372815 33.4267486,-116.9347018 33.4267502,-116.933143 33.4292131,-116.9313143 33.4306712,-116.9298153 33.4322199,-116.9288345 33.433306,-116.9275378 33.4365801,-116.9272611 33.4407015,-116.9276312 33.4429327,-116.9294641 33.4466307,-116.9311786 33.448879,-116.93275 33.4501613,-116.9360734 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However it registers as valid and any attempt to backup and restore it seems to make it not output the SRID. So I'm trying to figure out how I can export it in its defective form for further examinations.

I can do a ST_Dump — and ST_Union process on it and it still remains defective (outputing the SRID in the ST_AsText).

However if I do:

geom::bytea::geometry

Thatfixes it. Which I guess is why I have no luck exporting this monster without mutating it.

[robe]

ahah — I was able to remutate it outside of my database by running these. So not sure if the issue is with ST_Dump or ST_Union except it seems to be fine in my PostGIS 2.0 database, but spits out this thing in my 1.5. Both are running GEOS 3.3.1

See attached table and query

-- no weirdness --
SELECT ST_AsText(geom) from weird_mpoly;


--it mutates into something scary --

SELECT ST_AsText(ST_Union(geom))
FROM (SELECT (ST_Dump(geom)).geom
FROM weird_mpoly) As foo ;

Strk — remember that problem I was talking about and how it crashed my server and I couldn't figure out which set of data I was processing. I wonder if something like this was happening. This geometry is generated from the same process that caused the crashing I mentioned in ticket.

​http://trac.osgeo.org/geos/ticket/473

[strk]

My bet is on ST_Union, ST_Dump is expected to leave the SRID in, ST_Union should drop the SRID from all components and add it to the result.

[strk]

What does ST_Summary(ST_Union(…)) return ?

[robe]

MultiPolygon[BS] with 6 elements
  Polygon[S] with 1 rings
   ring 0 has 201 points
  Polygon[] with 1 rings
   ring 0 has 213 points
  Polygon[] with 1 rings
   ring 0 has 25 points
  Polygon[] with 1 rings
   ring 0 has 78 points
  Polygon[] with 1 rings
   ring 0 has 81 points
  Polygon[] with 3 rings
   ring 0 has 284 points
   ring 1 has 22 points
   ring 2 has 46 points

[robe]

The ST_Summary of the normal geometry (without the union (the regular one that doesn't have srid stuck in the ST_AsText output looks a little different). It returns

MultiPolygon[BS] with 6 elements
  Polygon[] with 1 rings
   ring 0 has 201 points
  Polygon[] with 1 rings
   ring 0 has 213 points
  Polygon[] with 1 rings
   ring 0 has 25 points
  Polygon[] with 1 rings
   ring 0 has 78 points
  Polygon[] with 1 rings
   ring 0 has 81 points
  Polygon[] with 3 rings
   ring 0 has 284 points
   ring 1 has 22 points
   ring 2 has 46 points

[strk]

Weird, I would have expected a srid only in the first element, not in the outer container too. Anyway you can see the problem is that the element of a collection has a srid value.

Ah, yes, probably ST_AsText, being an OGC function, stripped the SRID to avoid having it in the output. Most likely ST_AsEWKT will show the SRID in both the container _and_ the interior.

The bug is still in whatever constructed that geometry (ST_Union in this case).

[robe]

Yes indeed: ST_AsEWKT of SELECT ST_AsEWKT(ST_Union(geom)) FROM (SELECT (ST_Dump(geom)).geom FROM weird_mpoly) As foo ;

SRID=4326;MULTIPOLYGON(SRID=4326;((-116.9937666 33.4711291,-116.9936485 33.4698868,-116.992874 33.4689698,-116.9911977 33.4686095,-116.9889499 33.4689424,-116.9865345 33.4688388,-116.9849953 33.4684547,-116.9832575 33.4670819...

SELECT ST_AsEWKT(geom) from weird_mpoly; returns {{{ SRID=4326;MULTIPOLYGON(((-116.9937666 33.4711291,-116.9936485 33.4698868,-116.992874 33.4689698,-116.9911977 33.4686095…

}}}

I'm not sure why it does it with just this geometry though. dump/union is something I do all the time and with even more complex sets and this has never happened to my knowledge. I spot checked some of my others and they look fine.

I fear this is something we introduced in 1.5.3, because like I said, I don't seem to be able to replicate it on my 1.5.2 install but can on a clean 1.5.3 install. Granted my 1.5.2 has gone thru many upgrades.

I'm not sure GEOS is the culprit or even Union since I am running GEOS 3.3.1 (wlel maybe GEOS 3.3.0 on my 1.5.2). I have to check.

I'm beginning to get suspicious of ST_Dump. I'll check if we made changes to that in 1.5.3

strk — are you able to replicate it on your end with a 1.5.3 the weird_mpoly.sql I attached. It oculd be a windows only issue.

I don't see the behavior in 2.0, but it could be camouflaged by the the changes we've made so may be lurking in a different form.

[strk]

I'm talking about ST_Union the postgis side, not the geos side. Don't have time shortly to look at this, but I would go straight into the code to verify my theory.

[strk]

I've no idea how to reproduce this bug. ST_Union seems to be safe on itself. Maybe that geometry ended up in your db _before_ a bug was fixed ?

[robe]

I think it might be the dump not the st_union. Are you testing on 1.5.3? You don't see the behavior on 2.0.0.

Also note in the script I gave you, the actual generated table is fine. It after I run the combination of dump and union that things go get messed up. you also can't replicate this in 2.0.0. My 2.0.0 seems to behave correctly.

[robe]

strk - FYI - just retired again on a1.5.3 database running the latest 3.3.2dev and I still get the same weird behavior. Now I fear it might be a windows only bug.

Do you have a 1.5 install? I haven't compiled 1.5.4svn to see if the problem is still there I'll try to do that later.

Make sure you are testing with the script I attached to this ticket

http://trac.osgeo.org/postgis/attachment/ticket/1252/weird_poly.sql

[robe]

Okay I've isolated the problem even further. This is a very bizarre mystery that only seems to effect this geometry (there may be other geometries), PostGIS 1.5 (both .2,.3, and branch/1.5) and only shows up on PostgreSQL with PostGIS running on 64-bit windows. Strangely Windows 32-bit running 32-bit PostGIS does not show this behavior (I tested on a windows 2003 before as I mentioned, and just now tested on a windows 2008 32-bit windows against 1.5.2 and 1.5.4SVN). So it could be ST_AsText possibly how we are parsing something that 64-bit windows is sensitive to. Though why it would be different from original vs. when you dump reunion seems a little strange.

What I didn't notice before is that on Windows 64-bit (I've tested on Windows 7 and Windows 2008) which show this strange behavior. When I first looked at the text in PgAdmin — I thought nothing was there because the first line seems to contain some sort of line break in addition to the srid=4326. On the Windows 32-bit there is no line break.

[robe]

forgot to add on the windows 2008 32-bit I just tested I also tested with GEOS 3.2.2 (which it had already installed), GEOS 3.3.2dev. All worked fine with 1.5.2 and 1.5.4. I'll assume 1.5.3 was fine too but didn't test that since my 64-bit testers failed on all 1.5 versions tested and all GEOS 3.3s tested. Note I was also using the same builds I had compiled on my 64-bit windows 7. So I think that rules out build as culprit.

[pramsey]

Somehow you've created a geometry collection that has the SRID set on an interior geometry. Now, that's not supposed to happen, so when you push it through other, saner, processes the result gets washed away. And if you go into geography (or into PostGIS 2.0) where it's not even possible to represent such a thing in the serialization, the effect is guaranteed to disappear.

Since this problem is not actually a corruption of the geometry itself, just a slight breaking of representation rules, and because it gets washed away so easily, and because nobody else is likely going to be able to product it, I'd suggest closing as wontfix. If we're concerned about the AsText representation, we could leave this open and try to ensure that the WKT generator in 1.5 (which of course has been replaced in 2.0) doesn't output SRID information on subgeometries as a matter of policy. It won't fix the geometry, but it will hide the effect. If we're going to spend time farting around with 1.5 representation functions though, the bug in the WKB parser is far more pressing (the fact that malformed WKB can crash the backend is a pretty big problem, which unfortunately requires a pretty big solution).

[robe]

Paul, I'm okay with closing this out as a wontfix, but fear it might be a sign of a bigger issue. The fact that it's not consistent across all platforms really bugs me as those often suggest not properly freeing memory.

I guess I'm more bothered about the fact that it's only windows 64-bit that seems to be able to do this not the windows 32-bit one (though I don't think we have tested Linux 64-bit bit). I've always taken it for granted that PostGIS 32-bit on 64-bit windows would behave exactly the same as PostGIS 32-bit on windows 32-bit since they would bothe be using 32-bit space.

This demonstrates it doesn't and I'm suspecting that the crashing in raster noted in #1066 might be a 32-bit vs. 64-bit windows issue too. Since Bborie can't reproduce the crash with my builds but I can on my 64-bit windows 7 desktop. I can only assume he is running windows xp 32-bit.

[Bborie Park]

I'll see about testing Windows again (Windows 7 64-bit with 32-bit PostGIS) once I'm done with my todo items by the code freeze.

[robe]

Bborie, Thanks. I'll try the reverse test on my 32-bit to see if the raster crashing I am seeing does not exist on 32-bit/32-bit.

[pramsey]

Voila, the small test case:

select st_summary(st_union(geom)) 
from (
 select (st_dump('SRID=4326;MULTIPOLYGON(((0 0, 1 1, 1 0, 0 0)),((4 4, 4 5, 5 5, 4 4)))'::geometry)).geom
) as foo;

Probably the union is the culprit, leaving an SRID intact on a subgeometry. This works for multipoly, but not multipoint, odd.

[pramsey]

So this calls perhaps for two fixes… firstly to not put SRIDs on subgeometries in ST_Union() (problem in both 32 and 64 bit), secondly to not emit them if encountered in st_astext (64-bit problem only, odd).

[strk]

Actually I can't reproduce the bug on my 32bit system with postgis 1.5.4SVN installed:

pgis15=# select st_summary(st_union(geom)) 
pgis15-# from (
pgis15(#  select (st_dump('SRID=4326;MULTIPOLYGON(((0 0, 1 1, 1 0, 0 0)),((4 4, 4 5, 5 5, 4 4)))'::geometry)).geom
pgis15(# ) as foo;
            st_summary            
----------------------------------
 
 MultiPolygon[BS] with 2 elements
   Polygon[] with 1 rings
    ring 0 has 4 points
   Polygon[] with 1 rings
    ring 0 has 4 points
 
(1 row)

Time manually review PG_FREE_IF_COPY calls ?

[ipackham]

I have also seen this problem on my 64-bit Windows machine (running PostGis for 32-bit). The resulting geometries of an ST_Union has a misplaced SRID. This crashes QGIS when it tries to load from the table. If I backup the table and restore it, the strange SRID is gone, so PostGIS seems to be able to fix it, but QGIS can't. Also look similar to a problem in QGIS mentioned a while ago:

​http://postgis.refractions.net/pipermail/postgis-users/2008-October/021750.html

I can supply a dump of my geometries that, after running an ST_Union creates the weird geometries, let me know if (how?) you want these. I see a work around above using bytea, which I will try, but would like to know if this fix will be in v1.5.4 or is it already fixed in v2.0 for Windows?

[strk]

ipackham: please test 1.5.4SVN and let us know if the problem persists. I couldn't reproduce it.

[ipackham]

Hi Strk

I have not managed to install 1.5.4SVN on Windows. Any hints on how to do this? (I have tried MSYS and CygWin, but after running ./configure both say "no acceptable C compiler found in $PATH" - calling $PATH I get the message "…C/Program: No such file or directory")

In the meantime I have confirmed that after running the same SQL script, the strange geometries do not seem to be present in PostGIS 2.0, and QGIS loads the table OK.

In version 1.5.3 I think I have a workaround (SQL version) using ST_AsBinary on the geomeries before ST_Union, then adding back in the SRID. Something like

SELECT b.code, ST_Transform(ST_SetSRID(ST_Union(ST_Intersection(st_AsBinary(a.the_geom),st_AsBinary(b.the_geom))), SRID), SRID) as inters_geom 
from table1 a, table2 b 
where a.the_geom && b.the_geom
and ST_Intersects(a.the_geom,b.the_geom)
group by b.code;

Funnily enough, if you replace ST_AsBinary with ST_AsText, this also works. So there is probably something strange in the original geometries that cause ST_Intersection or ST_Union to behave like this.

[strk]

Ah, ok, it's the small test paul provided showing it clearly:

select st_summary(st_union(geom)) 
from (
 select (st_dump('SRID=4326;MULTIPOLYGON(((0 0, 1 1, 1 0, 0 0)),((4 4, 4 5, 5 5, 4 4)))'::geometry)).geom
) as foo;

Still happens as of 1.5.4SVN. Culprit is ST_Union. Any system is affected, not only windows.

[pramsey]

Fixed at r9671