Ah, no. Now I remember VRT is not the answer anyway; someone asking essentially the same question was complaining a while back that a VRT is very slow to load or pan, and rasterlite was suggested as the solution.
-----Original Message----- From: Alister Hood Sent: Thursday, 2 September 2010 1:13 p.m. To: [email protected] Subject: RE: [Qgis-user] gdalbuildvrt crashes with large number of images (Was: How do you deal with lots of raster data?) Thanks, I probably should have figured out that vrt is what I was after. Now I have a problem: I can create a vrt with only a small number of images using QGIS from the standalone 1.5.0 Windows installer (QGIS from the osgeo installer refuses to accept .ecw images). But if I try to create one with all the files I get this crash fairly quickly: gdalbuildvrt.exe - Application Error The instruction at "0x7c9369da" referenced memory at "0x0000000". The memory could not be "read". Has anyone else experienced a similar problem? -----Original Message----- From: maning sambale [mailto:[email protected]] Sent: Wednesday, 1 September 2010 9:01 p.m. To: Alister Hood Cc: [email protected] Subject: Re: [Qgis-user] How do you deal with lots of raster data? two options: - gdal's Virtual Raster Format (vrt) - you can create vrt files using the Raster Tools plugin - RasterLite - looks promising but not using it at the moment On Wed, Sep 1, 2010 at 4:44 PM, Alister Hood <[email protected]> wrote: > Hi everyone, > I'm looking for insight into dealing with large amounts of raster data in > QGIS; at the moment I'm really interested in just displaying background > images, not doing raster analysis. > > Trying to add several hundred ecw images takes an extremely long time and a > lot of memory. I thought QGIS might establish the location of each image > but only load images that are visible in the map extents (and maybe adjacent > images, to speed up panning and zooming). However it seems like it must be > loading all of the images. Is that right? > > Would it be better for me to install some sort of tile server that I can > load the images into and connect QGIS to? How do other people deal with > large amounts of raster data? > > Thanks, > Alister > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > > -- cheers, maning ------------------------------------------------------ "Freedom is still the most radical idea of all" -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ ------------------------------------------------------ _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
