[gdal-dev] NTF/JPEG2000 Question

[Frank Warmerdam]

On Sun, Jul 17, 2011 at 8:16 AM, Logan Greenlee
<lgreenlee at digitalresultsgroup.com> wrote:
> Sorry - here are the GCP's:
...
> Is there any particular reason mapserver can't use the GCP's for display? Is it that they are not necessarily corner points of the image?

Logan,

It is just not a feature of MapServer to support warping
(rubber sheeting) of images on the fly based on GCPs.  It
would be fairly computationally expensive to do this so I
deemed it not very useful in MapServer.  It also isn't something
I've seen requested often.

However, MapServer does support reprojecting images on
the fly which is similarly computationally expensive, so it
might make sense to add a mechanism to MapServer to use
gdal transformers (such as polynomial warping using GCPs)
as an option. It would require some development.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Software Developer