[gdal-dev] Get hold of TIFF structure

[Norman Goldstein]

My apologies.  I missed your response to my question.
Thanks for pointing me to GDALDataset::GetInternalHandle()
and the tiff library compatibility gotcha's.

To answer your question, I wish to use geotiff format to work in general 
XYZ space, and not necessarily tied to the Earth.  I still need 
transformations like XYZ <--> IJK, and would like to set the 4x4 
coefficients, directly.  I did not see how to reasonably do this trhough 
the gdal interface.  Understandably, gdal is designed around the Earth.


On 08/26/2014 12:49 AM, Even Rouault wrote:
> Selon Norman Goldstein <normvcr at telus.net>:
>
>> Let's say I've opened a dataset (from a tiff file on disk).  How do I
>> get hold of the TIFF structure that is used by the libtiff library?
> GDALDataset::GetInternalHandle() on a GTiff dataset will return a TIFF* handle.
> But be careful. If you use GDAL compiled with internal libtiff (libtiff 4.X),
> you must also link your application against libtiff 4.X, or export the libtiff
> symbols of the internal version of GDAL, otherwise chaos will happen.
>
> http://www.gdal.org/classGDALDataset.html#a39396324384dc195866a374775fa74ef
>
> Why do you want to access the TIFF handle ? Is there information you cannot
> access through GDAL API ?
>