[Gdal-dev] saving GeoTiff

[Ayman Kamal]

Then, if it can be derived, how can I do so, If it
can't, can you give me more explanation?

If you don't have enough time to answer me, can you
please givem me a link to a web page or whatsoever
resource that explains this. I need to understand this
point THOROUGHLY.


--- Frank Warmerdam <warmerdam at pobox.com> wrote:
> Ayman Kamal wrote:
> > Thank you very much sir, 
> > but still I have one point not clear enough:
> "pixel
> > sie", I want to ask the user to supply me with the
> > needed data, Shall I put in the dialog "pixel
> size"
> > 
> > please I need to understand this point correctly.
> 
> Ayman,
> 
> I can't easily judge what is appropriate for your
> dialogs.  It might well
> be that your users will have no idea what the size
> of a pixel is, and will
> want to give the top left, and bottom right lat/long
> coordiantes for an
> image from which you will need to derive the pixel
> size.
> 
> > By the way, I figured out that there are vertical
> > DATUMs like NAVD, are they supported in GDAL?
> 
> GDAL has no support for vertical datums.  The OGC
> Well Known Text format
> used by GDAL for representing coordinate systems
> does support compound
> coordinate systems which include a vertical datum,
> but GDAL (and the
> OGRSpatialReference) do *not* support these, much
> less use them for anything
> useful.
> 
> Best regards,
> 
> -- 
>
---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank
> Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows |
> http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial
> Programmer for Rent
> 
> 
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