[Qgis-user] Atlas generation - help please

[Alexandre Neto]

Hello john,

The way the atlas work is the following. You prepare a layout, then you use
one layer of the project as a coverage layer (full of features). When you
export or print using the atlas toolbar, it cycle all features center/zoom
to its geometries and print the map.

This would be useful to print some location maps for a few individuos from
a species, to take to the field.

More, if your layer have some significant attritutes, you can use then in
labels in your layout.  Even logos can be set.

Now,  you "problem"is slightly different. You want to see all points (say
the all country or region),  of a specific filtered specie. If the points
were completely disjointed, that is, no point of one specie ever overlay
another, I can imagine a way of doing it by using atlas and storing the
data in spatialite or postgis. Otherwise,  afaik there is still no way of
doing it in qgis

I remember Nathan wodrow talking about creating a funtion to access the
coverage layer attributes, that could be used in ruled based styling. This
would allow you to do what you need with great speed.

Maybe he still can do it, or maybe you are able to sponsor that new feature.

Alexandre neto
Em 01/09/2014 17:47, "John Norton" <john at jnecology.com> escreveu:

> Hi,
>
>
>
> I was very excited when I saw that automated ‘atlas generation’ had been
> added to the map composer in version 2, but I cannot figure out how it
> works. The User Guide documentation is very brief and the terminology is
> difficult to comprehend. What is meant by ‘geometries’ and  why would I
> want an atlas of ‘geometries’? Can someone give an example of what it might
> be used for and how it would be set up?
>
>
>
> The reason for asking is because I would like to be able to automate the
> process of creating maps showing wildlife distributions. GIS is used widely
> in the UK and other countries for storing wildlife data, but until now in
> order to produce atlases we have used software such as DMAP and MapMate. To
> those not familiar with wildlife mapping the simplest possible dataset
> would be a number of records of one or more species, each with an X and Y
> coordinate. The data can be saved as a shapefile point data layer. Each
> record is therefore a feature. The data can be styled as ‘single symbol’ so
> that records with the same coordinates overlie each other when viewed. To
> see the distribution map for a particular species the data needs to be
> displayed as ‘rule based’ and a rule set up to filter the records for each
> individual species (e.g. “Species” = ‘Quercus robur’ filters out records of
> Pedunculate Oak). The resulting map can then be output to a jpeg in the
> usual way using Print Composer. This process is unworkable, however,
> because every time a different species is viewed or output, the filter
> needs to be manually changed. The only other option at present is to split
> the data into separate layers, one for each species, so these can be turned
> on or off as needed. This is workable for small numbers of species but not
> for 1000+ species as would be required for a flowering plant atlas for
> example. So is creating a species distribution atlas possible using the
> atlas generation dialog in version 2, or is ‘atlas’ being used in a
> completely different sense here? And if it is not possible, is anyone
> working on a solution? It would be of huge benefit in the nature
> conservation world if so.
>
>
>
> John Norton, Gosport, UK
>
>
>
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