[Qgis-developer] Plugin GdalTools - Build Virtual Raster (catalog) idea to develop

Germán Carrillo carrillo.german at gmail.com
Wed Nov 24 15:35:03 EST 2010

Hi all,

I think you may reuse some code of the Load Them All Plugin [1] to
accomplish this.




2010/11/24 Giuseppe Sucameli <sucameli at faunalia.it>

> Hi Santiago,
> On Wed, Nov 24, 2010 at 6:01 PM, Santiago Lastra <
> santiago.lastra at gmail.com> wrote:
>> Recently I've found this very interesting and useful tool, at least for
>> me. I will propose two ways to improve the tool:
>> - The tool right now offers the user the possibility to select as many
>> files as he wants inside a directory. I propose to give also the possibility
>> to define only a directory that contains raster files (of every kind), with
>> a check box to give the oportunity to follow the subdirectories of the first
>> one.
> there's an opened ticket yet, see [1] ;)
>  - I think it's better to explain my problem and I think you will
>> understand the reason of my second proposal. I have directories with up to
>> 2000 raster files or even more. If you try the tool as is and if you select
>> "add to canvas", it takes several minutes to load and see the virtual raster
>> catalog (VRT) into QGIS, but if I zoom in to the right scale QGIS move the
>> images very quickly. What I suggest is to add in the dialog the possibility
>> to define the "scale dependent visibility" when the VRT is added to the TOC
>> of QGIS.
> Why don't you stop the rendering? So you can set the "scale dependent
> visibility"
> range using the existent layer properties dialog.
> Simply you can disable it either before you add the layer or while QGis
> loads it.
> Or maybe did I misunderstand?
> Cheers.
> [1] https://trac.osgeo.org/qgis/ticket/3095
> --
> Giuseppe Sucameli
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> --

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