comp.lang.idl-pvwave archive: archive » Re: map_proj

Home » Public Forums » archive » Re: map_proj_* help

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: map_proj_* help [message #66802 is a reply to message #66801]

Sun, 07 June 2009 19:45

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Ken Mankoff writes:

> Google Earth 5.x now supports defining the corners of an image
> overlay, not just the edges. Still, it does not line up, presumably
> because this is Polar Stereographic and Google Earth expects
> Equirectangular. My attempts to warp this using map_proj_* got
> nowhere. I've successfully warped a similar image when the 4 middle-of-
> edge points were defined, along with a scale of 250 m/pixel.

I have never been particularly successful warping images from one
projection to another with IDL. At NSIDC we use a program called
mapx to do the warping. It is a UNIX-only piece of software,
hard to install (although freely available), poorly documented,
and it works great after the resident expert shows you how it
works a half-dozen times or so.

But I recommend you go look up Frank Warmerdam and FWTools.
Frank and others have written a suite of tools that do just
about everything it is possible to do with maps and map
projections. GDAL is what you are looking for to do image
warping.

http://fwtools.maptools.org/

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Report message to a moderator

[Message index]

		Re: map_proj_* help By: David Fanning on Tue, 09 June 2009 07:12
		Re: map_proj_* help By: David Fanning on Mon, 08 June 2009 10:28
		Re: map_proj_* help By: mankoff on Mon, 08 June 2009 10:18
		Re: map_proj_* help By: David Fanning on Mon, 08 June 2009 10:03
		Re: map_proj_* help By: David Fanning on Mon, 08 June 2009 05:29
		Re: map_proj_* help By: mankoff on Sun, 07 June 2009 21:13
		Re: map_proj_* help By: David Fanning on Sun, 07 June 2009 20:51
		Re: map_proj_* help By: mankoff on Sun, 07 June 2009 20:46
		Re: map_proj_* help By: David Fanning on Sun, 07 June 2009 19:45
		Re: map_proj_* help By: David Fanning on Sun, 07 June 2009 19:38
		Re: map_proj_* help By: R.G. Stockwell on Sun, 07 June 2009 17:55
		Re: map_proj_* help By: David Fanning on Fri, 12 June 2009 07:29

Previous Topic:	Re: How to edit the file of classification
Next Topic:	Re: too many elements

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 04:11:50 PDT 2025

Total time taken to generate the page: 0.48092 seconds