[Qgis-user] Plugin to add a layer for each unique value in acolumn

Thu Mar 15 08:14:16 PDT 2012

I may have a look at seeing if I can use the shapefile splitter plugin and change it so it adds the layers as queries to the QGIS map canvas rather than saving out shapefiles.

How would you add a selection of an existing layer as a new layer to the map using python(without saving the selection to a file and then adding that files to the map)? The spatial query plugin seems to do this but I cannot find the code to see how it does it.

James Stott BSc (Hons) MSc | Senior Professional
Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/ 

-----Original Message-----
From: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of Andreas Neumann
Sent: 15 March 2012 14:33
To: qgis-user at lists.osgeo.org
Subject: RE: [Qgis-user] Plugin to add a layer for each unique value in acolumn

 Ok - so it seems like a reporting / map production problem.

 I am not sure if the "EasyPrint" or "Atlas" Plugin can help. EasyPrint 
 allows to print each feature on a separate map. But it sounds like for 
 your problem easy print would have to be extended to allow for maps per 
 filter or using a group attribute.

 I am not sure if there is an out of the box solution for your problem 
 with QGIS.

 For my own similar projects I set up a printing process using Apache 
 FOP with XSL-FO and then use QGIS-server to print the map extents. I 
 understand that this would be overkill/too much work to setup for you.

 Andreas

 On Thu, 15 Mar 2012 12:50:00 -0000, James Stott wrote:
> Hi Nathan/Andreas,
>
> I would happily use another method to deal with this but I haven’t
> managed to come up with one.
>
> My layer has site boundaries (20 of them) on it. I also have a layer
> with buffers for my sites in it. I have a buffer per site (20 sites)
> and these are from a PostGIS view as these alter whenever I change 
> the
> site boundary. I would like to then add each site boundary and each
> buffer onto a map as a separate layer because:
>
> 1) I add the site boundary and the buffer to a group, then the users
> can then turn each one on and off as needed when looking at the
> project file in QGIS.
>
> 2) For map production (using composers) I have a composer per site. I
> lock the layers in the composer map item and then jpg all my maps at
> the end. To do this I need to have each buffer on a separate layer as
> otherwise it would show the other sites as they are quite close
> together.
>
> The only way I can think to do this at the moment is to add each
> layer 20 times, and then query it by each individual site.
>
> James
>
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> http://www.npaconsult.co.uk/
>
> -----Original Message-----
> From: qgis-user-bounces at lists.osgeo.org
> [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of Andreas
> Neumann
> Sent: 15 March 2012 12:10
> To: qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Plugin to add a layer for each unique value
> in acolumn
>
>  Hi James,
>
>  And why would you need that? Maybe there is another solution to your
>  problem with just one or fewer layers.
>
>  Andreas
>
>  On Thu, 15 Mar 2012 11:08:04 -0000, James Stott wrote:
>> I would like to add a layer for each unique value of a text column 
>> in
>> a
>> table.
>>
>> For example, if I have a column called type, and the values in it
>> were
>> tree, stone and plant I would like to add a layer for each type. So
>> in
>> this example I would have 3 layers.
>>
>> I know there is a plugin called Shapefile Splitter that splits out 
>> to
>> a
>> shapefile for each unique value, but I just want it to split to
>> layers
>> in QGIS.
>>
>> James
>>
>>
>> James Stott BSc (Hons) MSc | Senior Professional
>> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
>> T: 01225 445548 | M: -
>> http://www.npaconsult.co.uk/
>>
>>
>>
>> 
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