[Qgis-user] Multiple Map Layout

[Anita Graser]

Hi Lee,

If I understand the workings of print composer correctly, "lock layers for
map item" does exactly that: Lock layers, NOT symbology. The symbology of a
locked layer can change. What the option does is to avoid that new layers
are added to the map or that layers are turned off.

Therefore, if you want multiple map items on a page displaying on dataset
in different styles, it seems necessary to duplicate the layer in the
project file.

Best wishes,

Anita


On Mon, Mar 5, 2012 at 6:41 PM, Lee Hachadoorian <lee.hachadoorian at gmail.com
> wrote:

> Not sure how this is supposed to work, but here is the behavior I observe.
>
> In Composer window:
>
> Add map item (A). Check "Lock layers for map item".
> Add map item (B). DO NOT check "Lock layers for map item".
> Change symbology in main QGIS window.
> Add map item (C).
>
> A and B display old symbology. C displays new symbology. But if you make
> more changes to the symbology, and want to update C, you have to hit
> Refresh view button. Now, *all* map items, whether or not "Lock layers for
> map item" is checked, change to new symbology. Similarly, if you change the
> layer extent in A or B, they update to display the new symbology.
>
> So it looks like if you add a map item, it will not update as long as you
> leave it alone and don't hit Refresh view. But then if you're unhappy with
> map item C, you have to delete it and add it in order to avoid hitting
> Refresh view. Furthermore, I don't see any difference in behavior between A
> and B. So what does "Lock layers for map item" actually do?
>
> Running 1.7.4 on Ubuntu 10.04.
>
> Thanks,
> --Lee
>
> On Mon, Mar 5, 2012 at 11:40 AM, G. Allegri <giohappy at gmail.com> wrote:
>
>> You can insert as many maps as you need and lock the layers inside the
>> map.
>> Set the symbology you need for one of your frames and the lock the layers.
>> Then change symbology for the other, and so on...
>> Look the "Lock layers for map item" inside the Map options of the left
>> side frame: http://bit.ly/A8owm6
>>
>> giovanni
>>
>> 2012/3/5 Lee Hachadoorian <lee.hachadoorian at gmail.com>
>>
>>>  I've used QGIS to create a layout with a main map and an inset (e.g.,
>>> Continental US with Alaska and Hawai'i as inset maps at different scales).
>>> But that's just two "viewports" onto the same underlying data. I wanted to
>>> make a layout where the same area would be displayed with two different
>>> symbolizations, side by side on the page for comparison. For those familiar
>>> with ArcGIS, I would normally accomplish this with two Data Frames.
>>>
>>> Is there any way to do this with QGIS? Or do I have to create two QGIS
>>> projects, and combine the maps externally (presentation software, page
>>> layout software, etc.)?
>>>
>>> Thanks,
>>> --Lee
>>>
>>> --
>>> Lee Hachadoorian
>>> PhD, Earth & Environmental Sciences (Geography)
>>> Research Associate, CUNY Center for Urban Research
>>> http://freecity.commons.gc.cuny.edu/
>>>
>>>
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>
>>>
>>
>
>
> --
> Lee Hachadoorian
> PhD, Earth & Environmental Sciences (Geography)
> Research Associate, CUNY Center for Urban Research
> http://freecity.commons.gc.cuny.edu/
>
>
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> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
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