[postgis-users] [Raster] MNT 250 IGNF data import problem

[Tumasgiu Rossini]

Hi,

Some tiles generated from the MNT file might be filled with nodata value
(-9999) so I guess that explains some "anormal" statistics values...
You should execute the statistics statement against all tile to check if
all statistics are the same...
I suggest you to test some commands from your home-compiled GDAL (gdalinfo
-hist for example) too.

Also, data from MNT files seems to be integer values, I don't think that
the correct pixel depth is 32BF.


For the QGIS issue, I think that mnt data is improper for display and
should be processed into "displayable" raster data, such as GrayScale or
TrueColors Bitmap. To do so, you might consider use st_colormap().





2013/10/22 Yves Jacolin <yves.jacolin at camptocamp.com>

> Hello,
>
> Yes it uses 32BUI (as far I can remember). I will check tomorrow and
> made more test.
>
> Thanks,
>
> Y.
>
> 2013/10/22 Pierre Racine <Pierre.Racine at sbf.ulaval.ca>:
> >> Because I did a quick test and copied past previous SQL requests and I
> did
> >> not
> >> clean it before! Of course you can remove the next 2 bands which don't
> >> exist
> >> but the first one should have correct statistic.
> >>
> >> Thanks Pierre to let me know the logical ;)
> >
> > Sorry I thought you were complaining about the error message not about
> the stats....
> >
> > MNT250_L93_FRANCE.ASC is a text file right? I would suspect a bad
> interpretation of the decimal separator.
> >
> > Check also what pixeltype was used by the importer with
> ST_BandPixelType() or ST_BandMetadata(). I suspect it used 32BUI (because
> it does not recognize the separator) when it should use 32BF.
> >
> > Pierre
> > _______________________________________________
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>
>
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