| Re: JPEG2000 and GEOTIFF query [message #61909 is a reply to message #61726] |
Sat, 02 August 2008 03:06  |
Gaurav
Messages: 50
Registered: January 2007
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Member |
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Thanks indeed for your pointers. As always, they have been quite
helpful. Even though my question was specifically for georeferenced
JPEG2000 images, the information in the webpage whose link was
provided by you, coupled with the information given here:
http://students.ee.sun.ac.za/~riaanvdd/jpeg2000.htm
makes quite a bit of sense. It says:
"The GeoJP2™ format is essentially a degenerate GeoTIFF file (with no
image data) embedded in a UUID box in the JPEG2000 file to provide
coordinate system information and a mapping between pixel coordinates
and georeferenced coordinates."
So, I tried playing around with UUID boxes in JPEG2000, but could not
have much success- primarily due to lack of examples. Could anyone
please point me to a good example where
a georeferenced JPEG2000 has been created-or maybe some substantial
chunk of data has been stored in UUID boxes.
And, of course, you are right that I have no right to be called a
programmer if I am not capable of doing such a simple task as
computing offsets-and you can say that even on your 'non-cranky'
mornings. But all I wanted to say was that when using the subrectangle
keyword returns a smaller portion of the image, the corresponding
GEOTIFF structure should also return information corresponding to that
subset of image. I was just seeking to find if anyone else feels the
same way. It is fine with me if it is fine with the majority. But in
my "Perfect World", GEOTIFF would work in the way I described
earlier. ;)
Regards
Gaurav
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