Re: [postgis-users] USGS NED Dataset
Steve, Yes it can. You would use gdal2wkraster.py packaged with WKT Raster to load the data in. You'll need working GDAL and Python 2.5 (I think 2.6 works as well now though haven't tried with 2.6). >From there you should be able to use the ST_Intersects functions to cross join your geometries with the elevation data. Pierre has a tutorial here covering some exercises with elevation data. http://trac.osgeo.org/postgis/wiki/WKTRasterTutorial01 The last chapter of our book covers various exercises in loading different types of raster data and working with geometry/raster together. http://www.postgis.us/chapter_13 We are in the middle of updating that since some things have been added/simplified since we last updated it. Thanks, Leo and Regina http://www.postgis.us -Original Message- From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Stephen Woodbridge Sent: Wednesday, August 18, 2010 4:36 PM To: PostGIS Users Discussion Subject: [postgis-users] USGS NED Dataset Hi all, Any thoughts on loading and using the USGS NED data set with postgis? My goal would be to take something like the Tiger Street data and augment that with elevation data for the Z values. Does the new raster support facilitate doing this? Has anyone already done this or can someone describe the process? Thanks, -Steve ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] side location conflict GEOS touches() threw an error
Hello, I have a postGIS polygon layer with about 320,000 rows. I am trying to return a table with object_number and the average area of the surrounding (touching) polygons. I am getting this error: NOTICE: TopologyException: side location conflict 1.34593e+07 289017 ERROR: GEOS touches() threw an error! ** Error ** ERROR: GEOS touches() threw an error! SQL state: XX000 I have tried to simplify the geometry many different times. Nothing seems to solve the problem. I can process the first 20,000 rows (object_number < 2) but something is causing problems after that. I have pasted the script below, any suggestions would be welcomed! Thank you, -david SELECT p1.ogc_fid, avg(p2.shape_area) FROM parcels09_d3_v2_simplify as p1, parcels09_d3_v2_simplify as p2 WHERE st_touches(p1.wkb_geometry, p2.wkb_geometry) GROUP BY p1.ogc_fid ORDER BY p1.ogc_fid ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] Problem cleaning invalid geometries
I have been setting up a PostGIS database with the boundary files from Census Canada. There are a number of invalid geometries, either Self-intersection at or near point X, Y or Ring Self-intersection at or near point X, Y, especially for the year 2006. For most of the files, the cleangeometry() function as found at http://www.sogis1.so.ch/sogis/dl/postgis/cleanGeometry.sql created by Duster Horst with suggestions by Kevin Neufeld (http://www.mail-archive.com/postgis-users@postgis.refractions.net/msg03531.html) cleans the invalid geometries up (although I haven't checked them for errors such as those Kevin talked about). However, for several geometries, the process runs for a very long time and the cpu use is listed as 100% from running top. One process I even left running for 2 days before killing it. Also, it seems that even after the cleaning of these geometries is successful, requests such as "SELECT * FROM table WHERE NOT ST_ISVALID(the_geom);" take a long time to complete and are listed as using 100% of the CPU while they run. Can anyone shed any light on why this might be? I was also interested in why some of the function calls in the cleangeometry() function do not have the "ST_" prefix in front of them. Is there any difference between a call to boundary and st_boundary, for example, in Postgis 1.4 or 1.5. I am running this on Ubuntu LINUX with PostgresPlus 8.4SS from EnterpriseDB, since I always set the path as PATH=/opt/PostgresPlus/8.4SS/bin. This is with Postgis 1.4, I believe, although it looks like someone else on the machine has also enabled postgis 1.5 in the synaptic package manager. Thanks, Loretta ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] make install fails with PostGIS 1.5.1 on PostgreSQL 9.0 Beta4
make install fails with '/usr/local/pgsql/share/contrib/postgis-1.5' make[1]: /usr/local/pgsql/share/contrib/postgis-1.5: Command not found I see other similar posts in the archives, sounds like ver 1.5.2 will fix this. In the meantime, are there instructions for manually installing the compiled files? I tried the tips in sec 2.4.4 of the manual but am still missing components. This is on CentOS 5.5. Thanks for any help. Lee ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] USGS NED Dataset
Hi all, Any thoughts on loading and using the USGS NED data set with postgis? My goal would be to take something like the Tiger Street data and augment that with elevation data for the Z values. Does the new raster support facilitate doing this? Has anyone already done this or can someone describe the process? Thanks, -Steve ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] QGIS requires
On 18 August 2010 11:46, Paul Ramsey wrote: > If this isn't a ticket for qgis, it should be. They should be able to do > readonly access to tables and views that do not have unique keys, no excuses. QGIS ticket #62 is four years old now: https://trac.osgeo.org/qgis/ticket/62 As mentioned earlier, you need to engineer a sequence in there somewhere in a low-lying table that you can use in your view as your surrogate primary key. It can be tricky, but there is always a way to find it. -Mike ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] QGIS requires
Using the plugin "RT SQL Layer" is possible to add to qgis a query sql . It call directly posgres without use a memory provider, without save temporary data on datafile and without creating temporary tables. But again qgis need to have a field with unique integers. I don't sure but perhaps to avoid this needed you can use the "generate_series" to add a sequence number to your query sql. -- - Andrea Peri . . . . . . . . . qwerty àèìòù - ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] QGIS requires
If this isn't a ticket for qgis, it should be. They should be able to do readonly access to tables and views that do not have unique keys, no excuses. P. On 2010-08-18, at 10:51 AM, William Furnass wrote: > Hi, > > QGIS requires that all PostGIS tables/views have a numeric primary > key. As a result I have had to create many temporary tables solely > for the purpose of viewing the results of queries when ideally I would > have liked to create views from the majority of my queries. Does > anyone know if I can create on-the-fly a serial numeric column in > queries/views to save me having to create so many temporary tables? > It'd be grand if something like the following were possible: > > CREATE VIEW my_view AS (SELECT numeric_id_generator(), > St_Union(wkb_geometry) FROM my_subregions GROUP BY region_id); > > Cheers, > > Will > ___ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] QGIS requires
On 18 August 2010 19:51, William Furnass wrote: > Hi, > > QGIS requires that all PostGIS tables/views have a numeric primary > key. As a result I have had to create many temporary tables solely > for the purpose of viewing the results of queries when ideally I would > have liked to create views from the majority of my queries. Does > anyone know if I can create on-the-fly a serial numeric column in > queries/views to save me having to create so many temporary tables? > It'd be grand if something like the following were possible: > > CREATE VIEW my_view AS (SELECT numeric_id_generator(), > St_Union(wkb_geometry) FROM my_subregions GROUP BY region_id); > > Cheers, > > Will Hi, If you control the table creation, or if you can recreate them, you can enable oids on the table: this hidden column stores a unique identifier and qgis seems to use it to identify geometries. (oids are disabled by default on recent postgresql versions, to avoid a potential problem if the total number of records in the database exceed the integer type limit (~4 billions. see: http://www.postgresql.org/docs/8.4/static/ddl-system-columns.html). Otherwise, a sequence will do the trick, as Aman ( fastly ;) ) noted. Nicolas ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] QGIS requires
Hi,
Yes, there is a way to do this.
First, you have to create a 'sequence'. But you only have to do this once. It
won't really matter if several different tables are using the same sequence in
your situation.
create sequence sq; -- You only have to do this once. You could also make a
temporary sequence. create temporary...
CREATE VIEW my_view AS (SELECT
nextval('sq'), -- this is the function to access the next number from your
sequence.
St_Union(wkb_geometry) FROM my_subregions GROUP BY region_id);
aman
-Original Message-
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of William
Furnass
Sent: August 18, 2010 1:52 PM
To: PostGIS Users Discussion
Subject: [postgis-users] QGIS requires
Hi,
QGIS requires that all PostGIS tables/views have a numeric primary
key. As a result I have had to create many temporary tables solely
for the purpose of viewing the results of queries when ideally I would
have liked to create views from the majority of my queries. Does
anyone know if I can create on-the-fly a serial numeric column in
queries/views to save me having to create so many temporary tables?
It'd be grand if something like the following were possible:
CREATE VIEW my_view AS (SELECT numeric_id_generator(),
St_Union(wkb_geometry) FROM my_subregions GROUP BY region_id);
Cheers,
Will
___
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Re: [postgis-users] Trunk version problem with st_dumppoint
On Aug 18, 2010, at 7:31 PM, Andrea Peri wrote: psql:query.txt:19: ERROR: could not find function "LWGEOM_numpoints_linestring" in file "/usr/local/pgsql/lib/postgis-2.0.so" Look like your PostGIS spatial function definitions is not synchronize with the .so Try to recreate a new postgis database, it should work -- Olivier ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Calculate Bounding Box of a point type table
> My fear of ST_Extent was the Note: warning in the users guide that it
> replaced the geometry metadata? And that I would have to re-set the srid
> after performing the query.
>
Hi
It does not replace the metadata, it just returns a bouding box
object, that does not keep track of the SRID.
So if you want to use st_extent in conjunction with geometries of the
table, you would have to cast it to a polygone, and to set the srid on
this polygon:
select st_asewkt(st_extent(st_geomfromtext('LINESTRING (0 0, 1 1)',
4326))::geometry);
vs
select st_asewkt(st_setsrid(st_extent(st_geomfromtext('LINESTRING (0
0, 1 1)', 4326))::geometry, 4326));
(you can use find_srid() instead of a hard-coded value, if you don't
know the geometries' SRID)
Nicolas
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[postgis-users] QGIS requires
Hi, QGIS requires that all PostGIS tables/views have a numeric primary key. As a result I have had to create many temporary tables solely for the purpose of viewing the results of queries when ideally I would have liked to create views from the majority of my queries. Does anyone know if I can create on-the-fly a serial numeric column in queries/views to save me having to create so many temporary tables? It'd be grand if something like the following were possible: CREATE VIEW my_view AS (SELECT numeric_id_generator(), St_Union(wkb_geometry) FROM my_subregions GROUP BY region_id); Cheers, Will ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] ¿obtain the bounding box from gr up of poligon?
On 18 August 2010 21:05, salas wrote: > Hi, i have the parcels table , and select various polygon > > ¿ how i can obtain the boundary of this group? > > best regards, salas > Hi, Or using the st_extent aggregate function (http://postgis.refractions.net/docs/reference.html), eventually with the group by operator to isolate sets of polygons. Performing a union on the geometries to extract the bouding box may take a lot of time. Nicolas ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] Trunk version problem with st_dumppoint
Hi, I'm having problems with some test with trunk version. I'm try-ing to test the 2.0.0 trunk version on a RedHat 64 bit with postgres 8.4.4. The version of postgis is this: POSTGIS="2.0.0SVN" GEOS="3.3.0-CAPI-1.7.0" PROJ="Rel. 4.7.1, 23 September 2009" LIBXML="2.6.26" USE_STATS (procs from 2.0 r5705 need upgrade) Try-ing this query from a file "query.txt": INSERT INTO public._test_campionamento_mp (id,idrtt,geom) ( select c.id, c.idrtt, st_union(c.geom) from ( select a.id as id, a.idrtt as idrtt, (ST_DumpPoints(a.geom)).* as geom from public._test_campionamento as a ) as c group by c.id, c.idrtt ); I see this error: psql:query.txt:19: ERROR: could not find function "LWGEOM_numpoints_linestring" in file "/usr/local/pgsql/lib/postgis-2.0.so" CONTEXT: SQL statement "SELECT ST_NumPoints( $1 )" PL/pgSQL function "_st_dumppoints" line 67 at istruzione SQL PL/pgSQL function "_st_dumppoints" line 24 at ciclo FOR su righe di SELECT SQL function "st_dumppoints" statement 1 This query work perfectly on postgres 8.4.4. + postgis 1.5.1 on WinXP so I don't understand what is missing ... -- - Andrea Peri . . . . . . . . . qwerty àèìòù - ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Calculate Bounding Box of a point type table
My fear of ST_Extent was the Note: warning in the users guide that it replaced the geometry metadata? And that I would have to re-set the srid after performing the query. Tony Appel The information contained in this communication may be CONFIDENTIAL and is intended only for the use of the recipient(s) named above. If you are not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication, or any of its contents, is strictly prohibited. If you have received this communication in error, please notify the sender and delete/destroy the original message and any copy of it from your computer or paper files. ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] ¿obtain the bounding box from gr up of poligon?
On 18 August 2010 20:05, salas wrote: > Hi, i have the parcels table , and select various polygon > > ¿ how i can obtain the boundary of this group? Try: SELECT St_Envelope(St_Union(my_geometry_column)) FROM parcels; Omit the 'St_Envelope(...)' bit if you want a multipolygon comprised of all polygons rather than a bounding box. Will ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] ¿obtain the bounding box from gr up of poligon?
Hi, i have the parcels table , and select various polygon ¿ how i can obtain the boundary of this group? best regards, salas ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Calculate Bounding Box of a point type table
On Wed, Aug 18, 2010 at 10:24 AM, Appel, Tony wrote: > I find out what the bounding box is for a table that contains point geometry. > > Newb alert: I have read about box2b, st_extent, st_envelope but none of those > seem to be exactly what I need. > > Thanks in advance. Hello, Could you elaborate on why ST_Extent is not providing what you need? For me, it works how I want :) select ST_Extent(geom) from lsrs_2010; st_extent -- BOX(-168.08 1.32,-64.7 70.6) (1 row) daryl ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] Calculate Bounding Box of a point type table
I find out what the bounding box is for a table that contains point geometry.
Newb alert: I have read about box2b, st_extent, st_envelope but none of those
seem to be exactly what I need.
Thanks in advance.
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From: postgis-users-boun...@postgis.refractions.net
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Subject: postgis-users Digest, Vol 100, Issue 10
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Today's Topics:
1. st_transform, irreversible? (Erik Rehn)
2. Re: st_transform, irreversible? (Paul Ramsey)
3. Re: st_transform, irreversible? (Paul Ramsey)
4. making polygons from center + vertex (Arnaud Sahuguet)
5. Re: making polygons from center + vertex (Francis Markham)
6. Re: making polygons from center + vertex (Arnaud Sahuguet)
7. Re: st_transform, irreversible? (Barend K?bben)
8. Re: st_transform, irreversible? (Mike Toews)
9. Re: st_transform, irreversible? (Ricardo Bayley)
10. Turn restrictions and directions of road on postgis pgrouting
table. (FRANK RADA)
11. Detecting wrong geometries (Andrea Peri)
12. Re: Detecting wrong geometries (Nicolas Ribot)
13. Re: Detecting wrong geometries (Andrea Peri)
14. Convert already loaded table into a spatial table (points)
(Appel, Tony)
15. Detecting wrong geometries (Andrea Peri)
16. Re: Convert already loaded table into a spatial table
(points) (Fabio Renzo Panettieri)
17. Re: Convert already loaded table into a spatial table
(points) (Fabio Renzo Panettieri)
18. Convert already loaded table into a spatial table (points)
(Andrea Peri)
19. Re: Convert already loaded table into a spatial table
(points) (Fred Lehodey)
20. Re: Convert already loaded table into a spatial table
(points) (Paul Ramsey)
--
Message: 1
Date: Wed, 11 Aug 2010 22:10:14 +0200
From: Erik Rehn
Subject: [postgis-users] st_transform, irreversible?
To: postgis-users@postgis.refractions.net
Message-ID: <4c6303a6.3010...@slagkryssaren.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hello Postgis Users!
This is my first post on this list so I will start by asking
a simple (and probably stupid) question. :)
While using ST_AsKml() to produce an overlay for Google Earth I
noticed that all my geometries where shifted slightly south-east.
I figured this had something to do with the transformation between
the projection that my geometries are stored in (SRID 3021) and WGS84
(4326) that is outputted by ST_AsKml()
Just to test I ran this:
SELECT ST_AsText(
ST_Transform(
ST_Transform(
ST_GeomFromText('POINT(59 18)',4326),
3021),
4326));
I input a point in WGS84 (59,18), transforms it to 3021 and then back to
WGS84. The result I get is:
POINT(58.8672757036296 18.0394763349359)
Can anyone explain this? Am I missing something regarding ST_Transform()?
Im running Postgis 1.5 on Windows.
Thank you for any help!
/Erik
--
Erik Rehn
Slagkryssaren
e...@slagkryssaren.com
www.slagkryssaren.com
--
Message: 2
Date: Wed, 11 Aug 2010 13:35:46 -0700
From: Paul Ramsey
Subject: Re: [postgis-users] st_transform, irreversible?
To: e...@slagkryssaren.com, PostGIS Users Discussion
Cc: meta...@lists.osgeo.org
Message-ID:
Content-Type: text/plain; charset=ISO-8859-1
Seems to be an underlying problem with proj4:
echo "59 21" | proj "+init=epsg:3021" | invproj "+init=epsg:3021"
58d49'47.733"E 21d2'54.745"N
And that's without doing the datum shift part.
P
On Wed, Aug 11, 2010 at 1:10 PM, Erik Rehn wrote:
> Hello Postgis Users!
>
> This is my first post on this list so I will start by asking
> a simple (and probably stupid) question. :)
>
> While using ST_AsKml() to produce an overlay for Google Earth I
> noticed that all my geometries where shifted slightly south-east.
> I figured this had something to do with the transformation between
> the projection that my geometries are stored in (SRID 3021) and WGS84 (4326)
> that is outputted by ST_AsKml()
>
> Just to test I ran this:
>
> SELECT ST_AsText(
> ? ?ST_Transform(
> ? ? ? ?ST_Transform(
> ? ? ? ? ? ?ST_GeomFromText('POINT(59 18)',4326),
> ? ? ? ?3021),
> ? ?4326));
>
> I input a point in WGS84 (59,18), tra
Re: [postgis-users] GEOS pointonsurface() threw an error!
I hope to be testing it next week On Wed, Aug 18, 2010 at 4:41 AM, Paragon Corporation wrote: > BTW - If any windows users want to try the trunk version (PostGIS 2.0) -- > we have experimental binaries (fairly recent as of last week) > > Here > http://www.postgis.org/download/windows/experimental.php > > Which includes lots more functions such as ST_MakeValid and ST_Split. As > welll as Polyhedral Surface support and Raster support. > > The PostGIS Team is always very excited to squash bugs early. So please > let > us know if you find problems or have trouble using the binaries. > > > Thanks, > Regina and Leo > http://www.postgis.us > > > > -Original Message- > From: postgis-users-boun...@postgis.refractions.net > [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Andrea > Peri 2007 > Sent: Wednesday, August 18, 2010 1:56 AM > To: postgis-users@postgis.refractions.net > Subject: [postgis-users] GEOS pointonsurface() threw an error! > > >My version is: "POSTGIS="1.5.0" GEOS="3.2.0-CAPI-1.6.0" PROJ="Rel. > >4.6.1, 21 August 2008" LIBXML="2.7.6" USE_STATS" > >PostgreSQL 8.4 running on a WINXP > > > >I was playing with the ST_IsValid() function and the ST_IsValidReason(). > > > >What I notice is the geometry, of course, is not valid. > >Reason: "Self-intersection[-6.4825e+006 -3.15411e+006]" > > > With the trunk version there (postgis 2.0.0) you can try the > ST_MakeValid(..) > > that turn the self-intersction in multi-polygon. > > Regards, > > Andrea. > > > ___ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > > ___ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Shape file importer. broken multipolygon
Hello Mark, I made a mistake in my previous mail. The postgis version I used was 1.4.1. I was confused with the postigis I installed a month ago in another computer. I downloaded the windows package one click installer and then use the stack builder to install the postgis extension. As you said that it was fixed, I upgraded my server and extensions with the new version of the windows installer. Now everything works fine and GUI importer behaves perfectly. Thank you , you put me on the right way. Best regards. Nicolas. -Original Message- From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Mark Cave-Ayland Sent: Wednesday, August 18, 2010 11:36 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] Shape file importer. broken multipolygon Hi Nicolas, It looks as if this bug has already been fixed in r5195, and hence should be included from PostGIS 1.5.0 onwards. Where did you get your PostGIS binaries from? HTH, Mark. -- Mark Cave-Ayland - Senior Technical Architect PostgreSQL - PostGIS Sirius Corporation plc - control through freedom http://www.siriusit.co.uk t: +44 870 608 0063 Sirius Labs: http://www.siriusit.co.uk/labs ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users -Original Message- From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Mark Cave-Ayland Sent: Wednesday, August 18, 2010 11:35 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] Shape file importer. broken multipolygon Nicolas Gillet - MARKET-IP wrote: > Hello List, > > I used the PGAdmin III plug-in to import shape files into my database > but I'm facing a problem. > > The shape file I am importing contains multi-polygon but the resulting > table after import contains only single polygon and some polygons are > then lost. > > Only one polygon is imported for every multi-polygon in the file. > > If I use the shp2pqsql command line tool (instead of GUI), I have the > right result. My multi-polygons are as they're supposed to be. > > So I think that the import plug-in is somehow configured to use > something like the "-S" forced switch of the shp2pqsql tool but I don't > find such option in the plug-in's options. > > I use a PosgreSql 8.4, Postgis 1.5 with PgAdmin III. > > The import plugin version is : shp2pgsql-gui $Revision: 5094 $. > > Any idea of what's wrong ? > > Thanks for any input. > > Nicolas ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] which geometry type ?
On 08/18/2010 02:51 PM, Mauricio Miranda wrote: > 1) Create the geometry_column as generic type "GEOMETRY". It will allow you > to store any kind of geom. Related question: is it possible to create a geometry index on such a column ? -- Maxime ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] which geometry type ?
On 18 August 2010 14:39, Armand Turpel wrote: > Hi, > Which is the best strategy for storing geometries items if the type of > geometries could be a point, line or polygon. Geometrycollection ? or > storing items in different tables/columns with specific geometry type? What > about storing everything as polygons? A point could be stored as a very > small polygon. > > Hi I would say it really depends on what you are doing with these objects. If you store all objects in the same column, with a generic 'geometry' type and no check constraint on the column, then you won't be able to use most of the postgis functions on these objects, as many functions deal only with a geometry subtype (polygons, multi*, point, etc). Same apply if you want to render this column, for instance with mapserver, as you won't be able to tell MS how to render this composite objects. One column per geo type seems the be the "cleanest" way to store objects to be able to manipulate them fully. Nicolas ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] which geometry type ?
On Aug 18, 2010, at 09:39 AM, Armand Turpel wrote: > Hi, > Which is the best strategy for storing geometries items if the type of > geometries could be a point, line or polygon. Geometrycollection ? or storing > items in different tables/columns with specific geometry type? What about > storing everything as polygons? A point could be stored as a very small > polygon. > Hi Armand, You have many options: 1) Create the geometry_column as generic type "GEOMETRY". It will allow you to store any kind of geom. 2) Create multiple fields in the same table (as you said). 3) Create multiple tables, one for each type. 4) Create one main table with the common fields and use inheritance to create a child table for each type. Good luck! -- Mauricio Miranda Chief Development Officer http://www.xoomcode.com ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] which geometry type ?
Hi, Which is the best strategy for storing geometries items if the type of geometries could be a point, line or polygon. Geometrycollection ? or storing items in different tables/columns with specific geometry type? What about storing everything as polygons? A point could be stored as a very small polygon. # Scanned by MailMarshal - Marshal's comprehensive email content security solution. # ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] Shape file importer. broken multipolygon
Nicolas Gillet - MARKET-IP wrote: Hello List, I used the PGAdmin III plug-in to import shape files into my database but I’m facing a problem. The shape file I am importing contains multi-polygon but the resulting table after import contains only single polygon and some polygons are then lost. Only one polygon is imported for every multi-polygon in the file. If I use the shp2pqsql command line tool (instead of GUI), I have the right result. My multi-polygons are as they’re supposed to be. So I think that the import plug-in is somehow configured to use something like the “-S” forced switch of the shp2pqsql tool but I don’t find such option in the plug-in’s options. I use a PosgreSql 8.4, Postgis 1.5 with PgAdmin III. The import plugin version is : shp2pgsql-gui $Revision: 5094 $. Any idea of what’s wrong ? Thanks for any input. Nicolas Hi Nicolas, It looks as if this bug has already been fixed in r5195, and hence should be included from PostGIS 1.5.0 onwards. Where did you get your PostGIS binaries from? HTH, Mark. -- Mark Cave-Ayland - Senior Technical Architect PostgreSQL - PostGIS Sirius Corporation plc - control through freedom http://www.siriusit.co.uk t: +44 870 608 0063 Sirius Labs: http://www.siriusit.co.uk/labs ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] help setting up postgis
On 17 August 2010 17:11, Jan Saalbach wrote: > Nicolas, thank you for your help. I have imported a set of points using a > python to psql script which filled a GeometryColumn using the ST_MakePoint() > function. > > Now I would like to visualize the points using uDig. Since the set imported > is comprised of around 10 million points, drawing each point is not > possible. What I would like to do is create and just draw a bounding box of > the set of points. This way I could compare it to another set of points in > respect of the position to each other. > > The thing I do not know yet is how to do it using postgis , i.e. which > commands I need. Any tips on how I could go about visualizing two datasets > of scattered points? > > Regards, > Jan > Hi There were some threads about displaying such points set. Concerning the first question, you can use the table function st_extent(), that returns the bounding box of a set of rows. You could also use st_convexHull, to create a geometry representing the convex hull of your point set, which will give you a more precise picture of the pointset span. But it will take more time to compute. Nicolas ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
Re: [postgis-users] GEOS pointonsurface() threw an error!
BTW - If any windows users want to try the trunk version (PostGIS 2.0) -- we have experimental binaries (fairly recent as of last week) Here http://www.postgis.org/download/windows/experimental.php Which includes lots more functions such as ST_MakeValid and ST_Split. As welll as Polyhedral Surface support and Raster support. The PostGIS Team is always very excited to squash bugs early. So please let us know if you find problems or have trouble using the binaries. Thanks, Regina and Leo http://www.postgis.us -Original Message- From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Andrea Peri 2007 Sent: Wednesday, August 18, 2010 1:56 AM To: postgis-users@postgis.refractions.net Subject: [postgis-users] GEOS pointonsurface() threw an error! >My version is: "POSTGIS="1.5.0" GEOS="3.2.0-CAPI-1.6.0" PROJ="Rel. >4.6.1, 21 August 2008" LIBXML="2.7.6" USE_STATS" >PostgreSQL 8.4 running on a WINXP > >I was playing with the ST_IsValid() function and the ST_IsValidReason(). > >What I notice is the geometry, of course, is not valid. >Reason: "Self-intersection[-6.4825e+006 -3.15411e+006]" With the trunk version there (postgis 2.0.0) you can try the ST_MakeValid(..) that turn the self-intersction in multi-polygon. Regards, Andrea. ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
