Merge shapes from SAGA GIS (which can be used via Sextante) is quite fast, even with large shapefiles.<br><br><div class="gmail_quote">On Fri, Jul 5, 2013 at 10:25 PM, Giovanni Manghi <span dir="ltr"><<a href="mailto:giovanni.manghi@faunalia.pt" target="_blank">giovanni.manghi@faunalia.pt</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
<br>
> As I've got loads of shapefiles, to define the .prj for each is not<br>
> realistic (Vector>DataManagement Tools>Define Current Projection). I've<br>
> looked for a bulk process to create these but without luck<br>
><br>
> Do I need prj files & if so, how can I create a load of them?<br>
<br>
<br>
in QGIS master you can use SEXTANTE to batch process files, so you can<br>
use the "reproject layer" tool, and get a copy of your shapes with a<br>
proper .prj<br>
<br>
Then to merge the shapes you can use QGIS, but I agree that is very<br>
(very) slow for large shapes or large number of shapes.<br>
<br>
The faster tool/code I tested is<br>
<br>
<a href="http://gistncase.blogspot.pt/2012/05/python-shapefile-merger-utility.html" target="_blank">http://gistncase.blogspot.pt/2012/05/python-shapefile-merger-utility.html</a><br>
<br>
and it would be very nice to use it to replace the actual python code<br>
of the merge shapefiles qgis tool, see<br>
<br>
<a href="http://hub.qgis.org/issues/7208" target="_blank">http://hub.qgis.org/issues/7208</a><br>
<br>
<br>
cheers<br>
<br>
-- Giovanni --<br>
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</blockquote></div><br>