| JPEG2000 and GEOTIFF query [message #61733] |
Wed, 30 July 2008 03:24 |
Gaurav
Messages: 50
Registered: January 2007
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Member |
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Hi all,
I am working with large volume of geo-referenced data and would like
to save the images that I have in JPEG2000 format. I have seen that
one can preserve the geographic information when one uses proprietory
softwares like ENVI, even in jp2 format. They even have a name: GeoJp2
for it. My question is, can we create JPEG2000 images using IDL so
that they preserve the geographic information? It is easily done in
the case of TIFF images using the GEOTIFF tag. Is there something of
the sort available for JPEG2000?
And talking of TIFF, I would like to bring it to the notice of the
powers-that-be at IDL that it would be very useful if they could
modify the use of GEOTIFF keyword. Right now, if you obtain a sub-
rectangle of a large TIFF image, the structure returned by GEOTIFF is
exactly the same as it would be for the whole image. Would it not be
much more convenient if, in the case of subset images, the GEOTIFF
structure contains the geographic information about that small section
of the image, viz, the new easting, northing values etc. Right now I
have to do it on my own and I usually get confused offsetting the
values for the sub-rectangle.
I shall be very thankful for any insights into the matter, or support
from fellow IDL users, or any help if I am going wrong.
Gaurav
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