You might also find this helpful: http://underdark.wordpress.com/2011/03/07/how-to-specify-data-types-of-csv-columns-for-use-in-qgis/
Regards, Alister > Date: Sun, 2 Sep 2012 09:43:59 +0100 > From: Roy Marsh <roymars...@gmail.com> > To: Langen Mallya <cut...@gmail.com> > Cc: qgis-user@lists.osgeo.org > Subject: Re: [Qgis-user] Creating simple choropleths in Q1.8 > Message-ID: > <CABkMR69vo6iJvHEdCRhCeqyxSMzpxvtUz5HpDxj=qoSiwd- > w...@mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Yes, it's a data type issue. > Qgis imports as text so the data was not visible I used Field > Calculator to convert text to real and suddenly it all worked I hope a > future manual will mention this, as it affects everything Roy > 2012/9/1 Langen Mallya <cut...@gmail.com> > > > Look at the data types its real a numeric in definition. > > On Sep 1, 2012 12:19 AM, "Roy Marsh" <roymars...@gmail.com> wrote: > > > > > > IN QGIS 1.8 I want to create a simple choropleth to show 5 bands > for > > > a > > range of numeric values > > > I open Properties /Style for the vector layer and choose Legend > Type > > 'Continuous Colour' > > > This should allow me to group values in a specified field into > > meaningful bands > > > Unfortunately, the 'classification field' box is greyed out in the > > dialogue box, so no existing fields are selectable > > > Strangely, if a new field is created, this becomes one of the > > > selectable > > fields in the 'Classification field' box > > > > > > Surely the system should not behave like this? _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user
