[Qgis-user] Atlas generation - help please

[Sergio Vignali]

Hi Alexandre,
you say that you know a way to do that with postgis,
please could you explain that?

All the best

Sergio


2014-09-01 22:42 GMT+02:00 Alexandre Neto <senhor.neto at gmail.com>:

> 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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-- 
Sergio Vignali
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