[gdal-dev] How to add an external mask as internal mask to a GeoTIFF?

[Daniele Romagnoli]

On Tue, Jul 19, 2016 at 3:34 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le mardi 19 juillet 2016 15:27:05, Daniele Romagnoli a écrit :
> > Hi Even,
> > thanks for the feedback.
> >
> > I was using it as a -co "GDAL_TIFF_INTERNAL_MASK=YES" to the latest
> command
> > and I was getting
> >
> > *Warning 6: driver GTiff does not support creation option
> > GDAL_TIFF_INTERNAL_MASK*
> > Appending the line you provided me to that command worked!
>
> Yes, there is some confusion around configuration options vs creation
> options,
> and you must be careful about the terminology used in the documentation.
>
> "Configuration options" are specified either with "--config name value" or
> as
> environmenet variables or with CPLSetConfigOption(name,value) in C
>
> "Creation options" are specified with gdal_translate -co name=value or as
> "name=value" strings in the papszOptions argument of Create()/CreateCopy()
> methods in C/C++
>
> Right, when seeing that option on some previous commands in my shell
history, I have confused it as a Create option instead of a Configuration
one.
Thanks for the clarification. Very helpful.

Cheers,
Daniele


> GDAL_TIFF_INTERNAL_MASK is a configuration option since it can be used on
> an
> existing TIFF opened in update mode, to which you add a mask. Thus a
> creation
> option couldn't be used in that case (since a creation option is for when
> the
> target file does not exist yet).
>







>
> > Thanks.
> > Daniele
> >
> >
> > On Tue, Jul 19, 2016 at 3:12 PM, Even Rouault <
> even.rouault at spatialys.com>
> >
> > wrote:
> > > Hi Daniele,
> > >
> > > > I have 2 issues with that:
> > > > 1) This solution is really not optimal. Wondering if there is a
> single
> > > > command to attach an external tif as a mask band of an existing
> raster
> > > > (provided it has same CRS, resolution, bbox, ecc)
> > >
> > > None that I can think of. Your workflow is probably close to optimum if
> > > you don't want to create the VRT at hand
> > >
> > > I think we would welcome a contribution of a Python script that would
> > > allow things like :
> > > - gdal_add_band.py -mask in.tif mask.tif out.vrt
> > > - gdal_add_band.py -alpha in.tif alpha.tif out.vrt
> > > - gdal_add_band.py in.tif extra_band.tif out.vrt
> > >
> > > > 2) What I get is that the mask has been set as an external file
> > > > final.tif.msk.
> > > > Is there any config option or opening option to open the final.tif in
> > > > update mode so that the band mask can be added as internal geotiff
> > > > mask?
> > >
> > > Yes, "--config GDAL_TIFF_INTERNAL_MASK YES". See "Internal nodata
> masks"
> > > paragraph of http://gdal.org/frmt_gtiff.html
> > >
> > > Even
> > >
> > > --
> > > Spatialys - Geospatial professional services
> > > http://www.spatialys.com
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>



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