Thanks all for the replies and pointers. Jukka I am curious how were you able to merge upto 8GB shape files<div>I am using mapnik to render shape files its able to read shape files larger than 4Gb. I tried ogr2ogr to merge shape files which its failing after file size reached to 4G. I looked at the ticket and I see the patch is applied to gdal and I am building it from source. Could you tell me how did you merge shape files in this case.</div>
<div>Thank you,</div><div>Harsha<br><br><div class="gmail_quote">On Mon, May 2, 2011 at 9:19 PM, Jukka Rahkonen <span dir="ltr"><<a href="mailto:jukka.rahkonen@mmmtike.fi">jukka.rahkonen@mmmtike.fi</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">Brian Wilson <brian <at> <a href="http://wildsong.biz" target="_blank">wildsong.biz</a>> writes:<br>
<br>
><br>
> I am afraid you are out of luck, the shapefile format restricts its size to 32<br>
</div>bit. See bytes 24-27<a href="http://en.wikipedia.org/wiki/ShapefileEven" target="_blank">http://en.wikipedia.org/wiki/ShapefileEven</a> if the SHP part<br>
<div class="im">was not so restricted, I bet the DBF part is.<br>
<br>
</div>Actually the SHP part is setting the limit. DBF part can be much bigger and I<br>
have myself one with 32 GB. See also <a href="http://trac.osgeo.org/gdal/ticket/3236" target="_blank">http://trac.osgeo.org/gdal/ticket/3236</a><br>
<br>
Spatialite has worked fine for me as a target when merging shapefiles but only<br>
up to about 8 GB file size. After that appending new data became too slow. It<br>
was a long time ago and gdal Spatialite driver may be better now.<br>
<font color="#888888"><br>
-Jukka Rahkonen-<br>
</font><div><div></div><div class="h5"><br>
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