I'm trying to create a contour around polygons. I already managed to convert the polygons to lines and now I am trying to use SQLite and the ogr2ogr command to give them thickness. From online tutorials I gathered that
ogr2ogr -dialect SQLite -sql "SELECT ST_Buffer(GEOMETRY, 0.1) as geometry FROM lines" lines-buffered.shp lines.shp
should give me borders with a thickness of 0.1 in the current projection (which is Robinson ESRI:54030, whatever unit that translates to). I actually don't care that much about the exact thickness (I'd be fine with trial and error). Any hints what I'm doing wrong? When I'm looking at the resulting
lines-buffered.shp in QGIS it does not seem to have thickness.