[gdal-dev] Geotiff with bands of different type

[Martin Raspaud]

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Frank Warmerdam skrev:
> On Tue, Aug 10, 2010 at 7:16 AM, Martin Raspaud <martin.raspaud at smhi.se> wrote:
>> Hmmm, that sounds like a sufficient solution indeed, very good idea, thanks.
>>
>> Is there any scale/slope and offset/intercept tags defined in geotiff ?
> 
> Martin,
> 
> GDAL supports saving this style of metadata in a private tag as
> defined at:
> 
>   http://www.awaresystems.be/imaging/tiff/tifftags/gdal_metadata.html
> 
> To do so with the GDAL API use the SetOffset and SetScale methods
> on the GDALRasterBand:
> 
>   http://www.gdal.org/classGDALRasterBand.html#44e23beb3418c44a89d25ea708207fe1

Thanks for the link. Unfortunately, I'm using the python interface with gdal
1.6.2 (since a few minutes, instead of 1.5.3), and the SetOffset/SetScale
methods are not there.

I'll use the gdal private tags instead then...


> I should note that in theory the TIFF specification allows a
> mix of sample types, but in practice this is not done in the
> real world, and libtiff does not support it.
> 
> GDAL *does* support reading mixed band types from a variety
> of file formats, but not TIFF.  As noted, AddBand() can be used
> in a few format cases to create mixed band types though this is
> rarely done.

Thanks for the explanation. We might jump over to netcdf4 if geotiff becomes too
limited.


Best regards,
Martin

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