Voor hen die hier iets aan hebben; ik kwam het toevallig tegen op de 
gdal-dev lijst:

A merge of two shapefiles 'file1.shp' and 'file2.shp' into a new file 
'file_merged.shp' is performed like this (See 
http://www.gdal.org/ogr/drv_shapefile.html):

% ogr2ogr file_merged.shp file1.shp
% ogr2ogr -update -append file_merged.shp file2.shp -nln file_merged

Then convert to GPX:
% ogr2ogr -f "GPX" out.gpx file_merged.shp

Stefan
http://geoconverter.hsr.ch <http://geoconverter.hsr.ch/>


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