It's all to do with the map units. If your working in a projected (ie feet, meters etc) then the map units are very small compared to the scale of the map.
Segment size (map units) : This is how long each segment in the scale bar will be, a 5km long segment would be 5000 (ie 5000m because your projection is in meters) Map units per bar unit : if you want to display in km, then you'd put a bar unit at 1000 (5000/1000 = 5km). In short, you need to adjust the above parameters to suit the size/scale of the area you're creating a map for. On Thu, Oct 25, 2012 at 2:31 AM, michael chiverton <[email protected]> wrote: > Hi All, > > Why is it that sometimes when i add a scale bar to my maps in the map > composer it indicates a 0. How do i assure this does not happen is it > somthing in the qguis map field or is it an issue with the composer? > > thanks, > > Mike > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
