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.neum...@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@lists.osgeo.org >> > http://lists.osgeo.org/mailman/listinfo/qgis-user >> > >> >> >> -- >> Andreas Neumann >> http://www.carto.net/neumann/ >> http://www.svgopen.org/ >> > > > -- > Heikki Luhamaa <heikkil...@hot.ee> > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > -- Andreas Neumann http://www.carto.net/neumann/ http://www.svgopen.org/ _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user