Andrey, GDAL plugin can use overviews built with gdaladdo, which should avoid reading too much data into memory. Can you try building overviews and report back?
Re: dark tiles without data - what GDAL version are you built against? Dane On Jul 13, 2011, at 4:16 AM, Andrey VI wrote: > Hi! > > I have some problems with raster rendering in Mapnik2. I'm trying to render > some large semi-transparent paletted PNG images (hillshade layer, 4 files for > each zoom level: nw, ne, sw, se; levels from 1 to 11, whole world rendering). > PNG part of XML (for example): > <Style name="nw_zl06"> > <Rule> > <RasterSymbolizer opacity="1.0" mode="multiply" scaling="bilinear8" > filter-factor="-1" /></Rule> > </Style> > > <Layer name="nw_zl06"> > <StyleName>nw_zl06</StyleName> > <Datasource> > <Parameter name="type">gdal</Parameter> > <Parameter name="file">/home/mapnik/raster/nw_zl06.png</Parameter> > </Datasource> > </Layer> > > First problem. At the 6th level get an error: 'Segmentation Fault'. I think, > it's because of Mapnik trying to put a whole bitmap in the memory. Am I > right? And I think it's no good idea to put all big image in the memory. GDAL > doesn't do this. > > Second issue. At several zoom levels I get dark tiles without hillshade (not > whole world, but 3/4 part of it). I don't know why... > > So, I need any assistance to solve this problems. > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
