[Qgis-user] Re: vector points

[pcreso at pcreso.com]

Hi Tom,

For a bit more power & flexibility, load your GPS points into a POstGIS database, and create columns based on criteria such as reliability that you can use to set the size/colour/symbol.

PostGIS gives you useful tools to query & manage the data & QGIS gives you the ability to use PostGIS columns to control symbology.

Brent Wood

--- On Sat, 9/5/09, Micha Silver <micha at arava.co.il> wrote:

> From: Micha Silver <micha at arava.co.il>
> Subject: Re: [Qgis-user] Re: vector points
> To: mtnbiketrail at zzz.com
> Cc: qgis-user at lists.osgeo.org
> Date: Saturday, September 5, 2009, 2:44 PM
> mtnbiketrail at zzz.com
> wrote:
> > Is there a way to automatically assign a sized circle
> to a vector point?
> > I have a large number of gps waypoints and want to use
> varying circle sizes to represent +/- error. I would import
> these using the csv plugin.
> > 
> If by "assign" you mean display points by varying sized
> circles, then yes. Open the layer's "Properties" window and
> go to the "Symbology" tab. As "Legend type"  select
> graduated symbol.  Then in "Classification field"
> select which column represents the +/- error. Then enter a
> number for "Number of classes" and click "classify". Now go
> thru the list of classes fone by one and set up each symbol
> as a different size using the "Size" entry, or different
> color using the "Style options".
> 
> > Thanks,
> > Tom
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