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

[Giuseppe Sucameli]

Germán,

2010/11/25 Germán Carrillo <carrillo.german at gmail.com>

> 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.
>
the BuildVRT tool add only one layer to canvas. I unable to find the waste
of time
in cases like this.

Instead managing the render flag would be pretty useful in batch tools (e.g.
Translate).
Thanks a lot, I'm going to improve each batch tool by properly
disabling/enabling the
render flag while it adds layers to canvas.

Cheers.

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
>>>>
>>>>
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>>
>>
>> --
>> Giuseppe Sucameli
>>
>>
>
>
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-- 
Giuseppe Sucameli
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