[Qgis-user] qgis and big raster catalogs
DCarreira at edia.pt
Fri Mar 30 13:59:09 EDT 2012
One question: how to get a fast raster catalog in QGIS with a big number of rasters in it? (in this case 400 ecw)
I am having trouble getting this to work... I tried a vrt catalog and qgis just hangs when I load it.
Reducing the number of images makes it ok.
Is this a know limitation of gdal/qgis? Is there another approach to catalogs (not mosaics)?
What is the recommended approach to see a large number of images in QGIS when working at big scales (zoomed in)?
I thought of the following:
1-referenced shapefile catalog - like mapserver tileindex shapefiles
- Qgis does not support this
- Qgis is too slow when there are many images in the catalog
3-referenced catalog in some other format? Sqllite?
- Couldn't find an alternative
4-just load a directory full of rasters
- I didn't even investigate this option since I figure this would be painfully slow every time you would load the directory...
One last detail: I'm using ecw images, but I'm betting this is not format related...
I appreciate your thoughts and knowledge on this:)
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