Hey Steven, Are you trying to do this via a spatially enabled database? In PostGIS, the dissolve syntax looks like this:
"SELECT dissolve_field, ST_UNION(geometry) FROM table GROUP BY dissolve_field;" Roger On Mon, Jul 6, 2015 at 4:13 PM, Steven Lutz <ste...@ruggedrocksoffroad.com> wrote: > I've found some examples of how to dissolve features in a polygon using > gdal but I'm not familiar with how to implement them. > here is an example of what I've found, but I'm having trouble modifying it > > this is what I've come up with: > > ogr2ogr output.shp > input. > shp -dialect sqlite -sql > "SELECT ST_Union(geometry), dissolve_field FROM input GROUP BY dissolve_field" > > > it looks to me that it is trying to do this operation based on specific > attribute entries but I'm looking to ignore the attribute entrie and make > all features into one. > This is what I've tried: > the 32768.shp has an attribute named BLOCK and it's still not working.. > any ideas? >ogr2ogr -f "ESRI Shapefile" output.shp 32768.shp -dialect > sqlite -sql "select ST_union(block) from '32768'" Warning 6: > Normalized/laundered field name: 'ST_union(block)' to 'ST_union(b > > I am confused as to what I should be putting in the parenthasis of > ST_Union() > > Please advise. > Thank you > > > -- > Steven Lutz > President > Rugged Rocks, LLC > Sales & Support: (909)547-4651 > Nissan 4x4 Parts <http://ruggedrocks.com> / Off Road GPS Units & Maps > <http://ruggedroutes.com> > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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