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Re: Using map projections to display images [message #12603 is a reply to message #12596]

Tue, 25 August 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Sean Rumelhart (seanr@possys.com) writes:

> I'm trying to take digital air photo data with a known ground sample distance
> resolution and a single georeference point (taken from a GPS receiver) and
> display it in an arbitrary map projection. I have looked at the documentation
> for MAP_SET, MAP_IMAGE, and MAP_PATCH. Using the example provided in the
> documentation of MAP_PATCH, I have managed to get the image to come up in the
> right projection, but I am unsure how to keep the resolution of the image the
> same.

IDL just doesn't have the capability to display an arbitrary map
projection on an image. You must do the opposite and display
an image on an arbitrary map projection. Thus, it is VERY likely that
the "resolution" of your image is going to change. Just no way
around it at the moment, I'm afraid, although I do hear from
several people a month who would like to see this kind of
functionality.

> ------------------------------------------------------------ ----------
> Sean P. Rumelhart Positive Systems, Inc.
> seanr@possys.com 250 Second St. East
> PH: 406.862.7745 Whitefish MT 59937
^^^^^^^^^^^^^^^^^^^
Is it just my imagination, or is IDL showing up everywhere?!
Whitefish, Montana is in the heart of God's Country, for goodness
sake. Can you imagine sitting on the deck writing IDL programs
with Glacier National Park looming up behind you. If there
is a clearer vision of heaven on earth, I can't imagine
what it would be. I'll be taking some time off from this
newsgroup while I relocate. :-)

Cheers,

David

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[Message index]

		Re: Using map projections to display images By: mirko_vukovic on Wed, 26 August 1998 00:00
		Re: Using map projections to display images By: mgs on Tue, 25 August 1998 00:00
		Re: Using map projections to display images By: Liam Gumley on Tue, 25 August 1998 00:00
		Re: Using map projections to display images By: davidf on Tue, 25 August 1998 00:00

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