I have been using Argis 10.1 and been able to convert polygon m to polygon shapefiles. I would like to do this with QGIS but I am having difficulty in finding the correct tool to do so.
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If you have QGIS installed you may use OSGeo4WShell for this. The command would be something like this:
ogr2ogr -f "ESRI Shapefile" C:/Temp/countries.shp C:/Temp/countriesZM.shp -lco SHPT=Polygon
AND to convert to ZM it would be:
ogr2ogr -f "ESRI Shapefile" C:/Temp/countriesZM_2.shp C:/Temp/countries.shp -lco SHPT=PolygonZ