[Qgis-user] Creating simple choropleths in Q1.8

[Alister Hood]

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 <roymarsh11 at gmail.com>
> To: Langen Mallya <cutlan at gmail.com>
> Cc: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Creating simple choropleths in Q1.8
> Message-ID:
> 	<CABkMR69vo6iJvHEdCRhCeqyxSMzpxvtUz5HpDxj=qoSiwd-
> Wzg at 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 <cutlan at gmail.com>
> 
> > Look at the data types its real a numeric in definition.
> >  On Sep 1, 2012 12:19 AM, "Roy Marsh" <roymarsh11 at 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?