| Re: Using map projections to display images [message #12596 is a reply to message #12584] |
Tue, 25 August 1998 00:00   |
mgs
Messages: 144
Registered: March 1995
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Senior Member |
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In article <MPG.104c5e642287ecd4989682@news.frii.com>, davidf@dfanning.com
(David Fanning) wrote:
> 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
David, I think I've mentioned my plans to you and a couple other folks in
the past. I'm looking at property later this year to do just what you
mentioned. There is a company in Helena, MT called KISS that markets solar
panels for laptops. Of course, I'll have to tell everyone up there I'm
from South Dakota instead of California :-) We may even have to switch our
license plates to the South Dakota ones when we hit the border. Damn
California DMV is charging us 10x what South Dakota did for car
registration.
Just to keep some relevance to this post, you'll have to use the TriGrid
and Triangulate functions to map your data to a map projection.
--
Mike Schienle Interactive Visuals
mgs@ivsoftware.com http://www.ivsoftware.com
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