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On 07/24/2012 05:52 PM, Zoltan Szecsei wrote:
<blockquote cite="mid:500EB692.2070907@geograph.co.za" type="cite">
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<div class="moz-cite-prefix">On 2012/07/24 16:41, Micha Silver
wrote:<br>
</div>
<blockquote cite="mid:500EB40F.1080100@arava.co.il" type="cite">
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On 07/24/2012 03:10 PM, Zoltan Szecsei wrote:
<blockquote cite="mid:500E90D3.6090206@geograph.co.za"
type="cite">Hi, <br>
I have a SHP file of some 1.1m polygons, of which I need to
select about half of them, and save them as a separate SHP
file. <br>
<br>
The trouble is when I select either via a Query, or via the
TABLE using the select options below, it just falls asleep
(100% CPU (ok, 12% as it must be single-threaded)). <br>
After 45 minutes or so, I just kick it out and weep. <br>
<br>
My platform is Win 7 Prof 64 bit (also tried on 32 bit) and
using 1.8.0 Lisboa. <br>
<br>
The selects I have tried are: "sq21code" = "C016*" and also
tried using "IN" <br>
<br>
Any ideas what I am doing wrong and what I should try next? <br>
<br>
</blockquote>
<br>
In addition to Andre's correction about the * wildcard, with 1M
polygons, you probably should move the shapefile into a database
(i.e spatialite, PostGIS)<br>
</blockquote>
<br>
That would be a bit sad (in terms of extra steps).<br>
I'm trying with ogr on Linux, but haven't fiddled the correct
syntax yet:<br>
<br>
<tt>zls@gs0:~$ ogr2ogr -where " 21DigitKey LIKE 'C016%' "
zerf /mnt/geo_lvm0/SGO_cadastral/200909/WC/Erf.shp<br>
ERROR 1: SQL Expression Parsing Error: syntax error<br>
FAILURE: SetAttributeFilter( 21DigitKey LIKE 'C016%' ) failed.<br>
zls@gs0:~$<br>
</tt><br>
</blockquote>
<br>
This worked for me (on a *very* small shapefile. Some of the "Name"
attributes where "rest 1", "rest 2" etc):<br>
<br>
ogr2ogr -f "ESRI Shapefile" -where "Name LIKE 'Rest%'"
waypoints3.shp waypoints.shp<br>
<br>
<br>
<blockquote cite="mid:500EB692.2070907@geograph.co.za" type="cite">
<blockquote cite="mid:500EB40F.1080100@arava.co.il" type="cite"> <br>
<blockquote cite="mid:500E90D3.6090206@geograph.co.za"
type="cite">Thanks & regards, <br>
Zoltan <br>
<br>
<br>
<br>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
GIS Consultant, Arava Development Co.
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.surfaces.co.il">http://www.surfaces.co.il</a></pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.
65 Main Road, Muizenberg 7945
Western Cape, South Africa.
34° 6'16.35"S 18°28'5.62"E
Tel: +27-21-7884897 Mobile: +27-83-6004028
Fax: +27-86-6115323 <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.geograph.co.za">www.geograph.co.za</a>
===========================================</pre>
<br>
<br>
This mail was received via Mail-SeCure System.<br>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
GIS Consultant, Arava Development Co.
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il">http://www.surfaces.co.il</a></pre>
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