[gdal-dev] gdalbuildvrt

[Marius Jigmond]

Aníbal,

Have you tried opening the .vrt file with a text editor? For each
source .tif there should be three entries in the .vrt file (one per
band). What does gdalinfo source.tif say?

-marius

On Fri, 2011-02-04 at 11:41 -0200, Aníbal Pacheco wrote: 
> On 02/03/2011 04:59 PM, Frank Warmerdam wrote:
> > On 11-02-03 01:30 PM, Aníbal Pacheco wrote:
> >> Hi, I'm using gdalbuildvrt to produce a virtual raster layer which can
> >> then
> >> used in Mapnik and its ogcserver(WMS), everything works except that
> >> the result
> >> image is black & white and with a very poor resolution. The 2 source
> >> tif files
> >> used in this test were both colored with a good resolution. Any ideas?
> >
> >
> > Aníbal,
> >
> > I would suggest examining the resulting vrt to see if there is anything
> > odd about it. Start with gdalinfo to see if it's resolution seems
> > reasonable
> > and if in fact it is 3 bands. You might want to run "gdalinfo -stats
> > xx.vrt"
> > to get band statistics just to verify that the bands are radiometrically
> > distinct. Also, check that the band pixel type is reasonable - the same
> > as the source files.
> >
> > If that all looks ok, then perhaps visually examine the VRT with something
> > like QGIS.
> >
> > After that it comes down to talking to Mapnik people about why there are
> > problems.
> >
> > Best regards,
> 
> 
> I think there is something wrong with the vrt because QGis does not find 
> the 3rd band, here[0] is a screenshot to help. thanks
> 
> [0] http://imgur.com/OHnFg
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