[postgis-users] export polygon to shapefile problem

[Thomas Kouk]

Hi Marco,

I tried the sql statement in psql, it works fine, no error message.
There is no error message right above the usage information.
I do not want to reproject, polygon is already in SRID 27700.

The table's name could be the problem, because in pgadmin sql window or psql 
window it needs quotation (""). So I created a new table like the old one, only 
with a simpler name. I tried again, but still with no results:
ogr2ogr -a -f "ESRI Shapefile" file.shp PG:"dbname=postgis host=localhost 
user=postgres password=postgres" -sql "SELECT AsBinary(the_geom) as wkb_geometry 
FROM test"
Is there any other way?
Thanks



________________________________
From: Marco Lechner - FOSSGIS e.V. <marco.lechner at fossgis.de>
To: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
Sent: Wed, November 17, 2010 12:07:27 PM
Subject: Re: [postgis-users] export polygon to shapefile problem

try
C:\Program Files\FWTools2.4.7\bin>ogr2ogr -a srs "EPSG:27700" ...

Does your sql-statemnet produce a result when executed within psql?
Are you sure there's no error message right above the usage information?
Do you want to reproject to 27700? Then you should use -t_srs

Marco

Am 17.11.2010 12:56, schrieb Thomas Kouk: 
Thanks Helen,
>I've been trying to make it work. I don't have ogr2ogr.exe somewhere in 
>PostgreSQL folder. The only place where I have ogr2ogr.exe is in FWTools folder, 
>(other ones in OSGeo4W do not work, dll problems).
>So I try this:
>
>C:\Program Files\FWTools2.4.7\bin> ogr2ogr -a srs EPSG:27700 -f "ESRI Shapefile" 
>file.shp PG:"dbname=postgis host=localhost user=postgres password=postgres" 
>-sql "SELECT AsBinary(the_geom) as wkb_geometry FROM W_TQ2575_Buffer"
>After this I do not get any error message, but I get the ogr2ogr usage 
>information (as if something I typed is wrong) and the file.shp is not created 
>(cannot be found anywhere).
>Any help?
>
>
>
>
________________________________
From: Helen San Segundo Navazo <hsansegundo at meteo.cat>
>To: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
>Sent: Wed, November 17, 2010 9:29:15 AM
>Subject: Re: [postgis-users] export polygon to shapefile problem
>
>Hi Thomas,
>
>I use the next expression to export data automatically in an script from a table 
>with polygons into a shape file:
>
>
>ogr2ogr -a_srs EPSG:23031 -f "ESRI Shapefile" file.shp PG:"dbname=db_name 
>host=the_host user=the_user password=the_password" -sql "SELECT 
>AsBinary(the_geometry_column) as wkb_geometry, column2,column3,column4 etc. FROM 
>table where conditions"
>
>I hope this will help you,
>Helen
>
>
>Thomas Kouk escribió:
>> 
>> Hi all,
>> 
>> I am newbie in PostGIS and I have a problem exporting a polygon table in shp. I 
>>want to export specific spatial tables from by database using a batch procedure 
>>(bat file). The command I use is:
>> 
>> pgsql2shp -P [password] -f [shapefile path & name] postgis [tablename], for 
>>example: pgsql2shp -P postgres -f Data\Buffers\ Buffer.shp postgis buffer_table
>> 
>> It works fine with all other spatial tables (linestring or multilinestring 
>>type). For polygons it also seems to work, as I get no error message:
>> 
>> / Initializing... Done (postgis major version: 1)./
>> 
>> / Output shape: Polygon/
>> 
>> / Dumping: XX [1 rows]./
>> 
>> However, when I try to load the polygon shp in Qgis or ArcGIS I get an error: 
>>ArcGIS cannot open the file, while QGIS loads the shp but displays nothing (as 
>>if the table is empty, which is not the case).
>> 
>> All my tables are spatial tables with no information on geometry_columns table, 
>>but even if I add the polygon table in the geometry_columns, nothing changes. 
>>After all, the function works with all other spatial non polygon tables despite 
>>the fact that geometry_columns holds no information on them, so this is not the 
>>problem.
>> 
>> I can load the postgis polygon table in qgis and export it manually to a shp, 
>>which works fine, but I need to do it in an automatic way using a command.
>> 
>> Has anyone come to this problem or is there something I do not know about 
>>exporting polygon tables to shp?
>> 
>> Thanks.
>> 
>> 
>> ------------------------------------------------------------------------
>> 
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>>  
>
>
>-- 
>Helen San Segundo Navazo
>
>
>http://www.meteo.cat
>Tel. 93 567 60 90
>Fax 93 567 61 02
>A/e hsansegundo at meteo.cat <mailto:hsansegundo at meteo.cat>
>
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