[gdal-dev] Adding TIFFTAG_XRESOLUTION and TIFFTAG_RESOLUTIONUNIT values to GeoTIFF

[Even Rouault]

Dejan,

I've realized that the GeoTIFF driver documentation did not say much about 
that. Should be better now :
http://trac.osgeo.org/gdal/changeset/18689
http://trac.osgeo.org/gdal/changeset/18690

Basically if you use gdal_translate you can specify the tag values as metadata 
item:

gdal_translate in.whatever out.tif -mo TIFFTAG_XRESOLUTION=XXX -mo 
TIFFTAG_YRESOLUTION=YYY -mo TIFFTAG_RESOLUTIONUNIT=1, 2 or 3 -mo 
AREA_OR_POINT=Area

AREA_OR_POINT is not stictly speaking a TIFF tag, but a GeoTIFF key of the 
TIFFTAG_GEOKEYDIRECTORY tag.

Best regards,

Even

Le Friday 29 January 2010 09:01:48 Dejan Gregor, vous avez écrit :
> I would like to know, how I can set the following tag values via GDAL to
> the output GeoTIFF?
>
> TIFFTAG_XRESOLUTION
> TIFFTAG_RESOLUTIONUNIT
> TIFFTAG_XRESOLUTION
> TIFFTAG_SOFTWARE
> AREA_OR_POINT=Area
>
> Coordinate System is:
> LOCAL_CS[" Geocoding information not available Projection Name = Unknown
> Units =
>  other GeoTIFF Units = other",
>     UNIT["unknown",1]]
>
> Thanks!
> Dejan
>
> -----
>
> Dejan Gregor, MSc
> GISc Researcher and Consultant
>
> http://www.linkedin.com/in/dgregor