[Qgis-user] Print one map for every category in layer with fixed extent

[Alexandre Neto]

In the layer, where is the species recorded? In Columns?

If so, I have a workflow for that.

A sáb, 4/02/2017, 08:38, Blumentrath, Stefan <Stefan.Blumentrath at nina.no>
escreveu:

> Thanks Andreas for the excellent procedure description.
>
>
>
> Good to know that Python is not required for that, and that there is a
> nice, flexible, and efficient solution!
>
>
>
> For someone who uses QGIS on a regularly basis, this is actually much less
> work than it might seem at a first look.
>
> However, I am afraid, if I imagine that I try to explain that to my
> colleagues, many would not be able or not willing to follow, I am afraid…
>
>
>
> I found some more code snippets online, which I compiled into a small
> script. That could be easily wrapped into a plugin if none exists for that
> yet…??
>
>
>
> Cheers
>
> Stefan
>
>
>
> *From:* Neumann, Andreas [mailto:a.neumann at carto.net]
> *Sent:* torsdag 2. februar 2017 15.05
> *To:* Blumentrath, Stefan <Stefan.Blumentrath at nina.no>
> *Cc:* Qgis-user at lists.osgeo.org; Terje Blindheim <terje at biofokus.no>
> *Subject:* Re: [Qgis-user] Print one map for every category in layer with
> fixed extent
>
>
>
> Hi Stefan,
>
> It is possible without the help of Python.
>
> You would have to split up the species into layers.
>
> Then create an atlas layer that is the geometry you want joined with every
> possible layer. You can use QGIS virtual layers for that which you can
> define in DB manager. Or use a Postgis view for it.
>
> So for each geographic unit you want to print you need a combination with
> each layer you want.
>
> E.g.
>
> Province 1 - Species 1
>
> Province 1 - Species 2
>
> Province 1 - Species 3
>
> Province 2 - Species 1
>
> Province 2 - Species 2
>
> Province 2 - Species 3
>
> In this layer, the geometry is redundant, but since you can use Postgis
> views or virtual layers, it is only virtually redundant.
>
> -------------
>
> Finally, in print composer you would use data-defined layers or visibility
> presets based on attributes in the atlas coverage layers.
>
> I did exactly that - print an Atlas for several districts in my city and a
> loop of historic maps. For each district I printed around 15 different
> historic time snapshots (old maps).
>
> Hope this helps to get started.
>
> Andreas
>
> On 2017-02-02 11:21, Blumentrath, Stefan wrote:
>
> Dear all,
>
>
>
> In a project I like to produce a sort of species distribution atlas, where
> I like to print out (export to image) a map from the print composer for
> every species recorded within one and the same municipality.
>
>
>
> So, the map extent should not change and layout is fixed too. With these
> things fixed, I want to get a map for each single species mapped and thus
> also legend entries change. The species are in one single layer, but I
> could also split them if that makes it easier.
>
>
>
> Is there a function in Atlas for that which I overlooked or a plugin or
> the like.
>
> If not, is there any Python code I could repurpose for that? Found only
> this [1] and [2], where [1] does not work…
>
>
>
> But before I start looking into a pygqis solution I like to make sure that
> this feature does not exist yet…
>
> This is a not uncommon use case in ecology btw., so a built in function
> would be neat.
>
>
>
> I am grateful for any hint.
>
>
>
> Kind regards,
>
> Stefan
>
>
>
> [1]
> http://gis.stackexchange.com/questions/183589/using-pyqgis-to-create-images-from-the-qgis-print-composer-each-showing-a-differ
>
> [2]
> http://kartoza.com/en/blog/how-to-create-a-qgis-pdf-report-with-a-few-lines-of-python/
>
>
>
>
>
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-- 
Alexandre Neto
---------------------
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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