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

[Germán Carrillo]

Giuseppe,

I mean, the Load Them All plugin receives a base directory and an extension
(e.g. GML) to look for layers in the base directory and in its
subdirectories. It also loads those layers to QGIS by managing the canvas
setRenderFlag method to avoid an unnecessary waste of time in the process.

Regards,

Germán

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

> Hi Germán,
>
> 2010/11/24 Germán Carrillo <carrillo.german at gmail.com>
>
> I think you may reuse some code of the Load Them All Plugin [1] to
>> accomplish this.
>>
> what did you mean writing "to accomplish this", to load the layers or
> maybe to do a recursive scan?
>
> Cheers.
>
>
>> Regards,
>>
>> Germán
>>
>> -------------------
>> [1]
>> http://geotux.tuxfamily.org/index.php?option=com_myblog&task=view&id=264&Itemid=59&lang=en
>>
>> 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
>>>
>>>
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>
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>
>
> --
> Giuseppe Sucameli
>
>


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