[Qgis-user] Scale dependent visibility

[Heikki Luhamaa]

Thanks! This did the trick.

Heikki

On Mon, 15 Mar 2010 10:24:33 +0100 (CET)
"Andreas Neumann" <a.neumann at carto.net> wrote:

> One option is to introduce a VRT file.
> 
> VRT is a virtual file combining several physical rasters into one logical
> raster file by referencing the physical files. You can create a VRT-File
> with gdal on the command line, or maybe even more comfortable with the
> gdal-tools plugin.
> 
> After installing the gdaltools plugin use the "Build virtual raster" tool.
> 
> Andreas
> 
> On Mon, March 15, 2010 9:59 am, Heikki Luhamaa wrote:
> > Hi,
> >
> > this thing I know and works perfectly well for me. But, I need to apply
> > these visibility settings to several dozens of raster files at once. And
> > doing this one-by-one is quite time consuming. So, it would be nice to
> > have option to apply these setting to a bunch of files at once. For
> > example by right mouse-click on group tab and then selection group
> > properties and scale dependent visibility for whole group (dreaming...)?
> > But maybe there is some kind of work-around to achieve this. I am not
> > familiar with python (nor programming) but is it possible to implement
> > this kind of behaviour through plug-in?
> >
> > Heikki
> >
> > On Mon, 15 Mar 2010 09:22:32 +0100 (CET)
> > "Andreas Neumann" <a.neumann at carto.net> wrote:
> >
> >> Hi Heikki,
> >>
> >> For every data layer you can set the scale-dependent rendering with
> >> min/max values.
> >>
> >> Go to layer properties --> General --> Use Scale Dependent Rendering -->
> >> set min/max values.
> >>
> >> For correct scale calculations it is important that you correctly set
> >> the
> >> map units and projection parameters.
> >>
> >> Unfortunately, a data layer can only have one scale range, if you want
> >> to
> >> display the same layer with different filter and symbolization settings
> >> you have to load the layer several times.
> >>
> >> Alternatively, you can use a WMS server to serve your raster data and
> >> use
> >> the scale-range settings of your mapserver. This way your users only
> >> have
> >> to load one layer and the server deals with the scale settings.
> >>
> >> Hope this helps,
> >> Andreas
> >>
> >> On Mon, March 15, 2010 7:28 am, Heikki Luhamaa wrote:
> >> > Hi all,
> >> >
> >> > is there somehow possible to apply "Scale dependent visibility" option
> >> on
> >> > several raster layers or to the whole project at once? I have several
> >> > projects where I need to have open several dozens or more raster
> >> layers.
> >> > Despite qgis renders rasters quite quickly it would probably speed up
> >> > things if I can hide them, at certain zoom level.
> >> >
> >> > Thanks,
> >> > Heikki Luhamaa
> >> > _______________________________________________
> >> > Qgis-user mailing list
> >> > Qgis-user at lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >> >
> >>
> >>
> >> --
> >> Andreas Neumann
> >> http://www.carto.net/neumann/
> >> http://www.svgopen.org/
> >>
> >
> >
> > --
> > Heikki Luhamaa <heikkiluha at hot.ee>
> > _______________________________________________
> > Qgis-user mailing list
> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user
> >
> 
> 
> -- 
> Andreas Neumann
> http://www.carto.net/neumann/
> http://www.svgopen.org/
> 


-- 
Heikki Luhamaa <heikkiluha at hot.ee>