[Qgis-user] Layer driven Atlas

[Andreas Neumann]

Hi Thomas,

You will need a table with a record per page for the atlas coverage layer.

So if, f.e. you have a table with administrative units (with geometries) 
and a table with temporal layers (e.g. an ortho-image every 5 years or 
so) you will need to do a cross-join between the two tables.

See http://www.tutorialspoint.com/sqlite/sqlite_using_joins.htm

You can use the new Virtual layer feature from QGIS 2.14 to create such 
a layer on-the-fly without having to store a separate layer. Let us know 
if you need help on the virtual layer.

Hope this helps,
Andreas

On 01.03.2016 16:58, Thomas Colley wrote:
>
> Hi everyone
>
> I was just looking through the changelogs and got really excited when 
> I saw data defined control over map layers! 
> (http://www.qgis.org/en/site/forusers/visualchangelog212/index.html#feature-data-defined-control-over-map-layers-and-style-presets)
>
> This is exactly what I’d been asking about on the list last year 
> (http://lists.osgeo.org/pipermail/qgis-user/2015-August/033211.html) 
> so thanks so much to Nyall for adding this functionality!
>
> I’m not 100% sure that I’m using it in the correct way though. I have 
> managed to achieve it by duplicating my atlas coverage features so 
> that there is one feature per layer with an attribute holding the 
> layer name. I then use the attribute in the data defined layers option.
>
> Is this the way to do it or am I missing something? I wasn’t sure 
> where/if the ‘set layer list from a visibility preset’ should come 
> into play.
>
> When I first read the post I thought that the | separated list of 
> layers would be cycled through one by one but then realised that 
> they’d all be displayed together.
>
> I have a static list of 20 or so layers to cycle through for each site 
> so ideally if I could specify a list of layers (or visibility presets) 
> to loop through that would be amazing.
>
> Failing that I can write a little plugin to take a selected feature 
> and create a scratch layer with the feature duplicated with the layer 
> attribute values.
>
> Thanks again for adding this, it’ll be a massive time saver for us!
>
> Tom
>
>
>
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