comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: Plot and Plots

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

Re: Plot and Plots [message #58453 is a reply to message #58440]

Thu, 31 January 2008 14:22

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

pb24 writes:

> I have no trouble displaying the graticule and the continents using
> MAP_GRID,and MAP_CONTINENTS. The problem is that once I have these
> displayed, I'd like to plot the satellite image footprint on top by
> taking the four image corner coordinates and using PLOTS. I have done
> this using PLOTS when used in combination with MAP_SET (and with a
> stereographic projection), but I want ideally, to have a *polar
> stereographic* projection (they are not the same sadly - map
> projections!!). That is why I am having to use MAP_PROJ_INIT with 106
> projection number a GCTP type. Hope that makes my initial post a
> little clearer.

Yeah, sorry, I should have used 106 in my example,
but after consulting with the map projection experts
around here, we are at a loss as to how a polar stereographic
projection is any different from a stereographic
projection, centered on a pole. :-)

If you were successful plotting your image footprint
using MAP_SET, I would guess the values are in lat/lon
space. If you want to do the same thing with a GCTP
projection (and you *always* do, forget you ever heard
about MAP_SET, is my advice), you will need to transform
the image values into UV space (with MAP_PROJ_FORWARD) and
set up the UV coordinate space as I explained in the
previous post.

Cheers,

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

Report message to a moderator

[Message index]

		Re: Plot and Plots By: Paul.Bowyer@gmail.com on Fri, 01 February 2008 06:21
		Re: Plot and Plots By: David Fanning on Fri, 01 February 2008 05:29
		Re: Plot and Plots By: Paul.Bowyer@gmail.com on Fri, 01 February 2008 03:08
		Re: Plot and Plots By: David Fanning on Thu, 31 January 2008 14:22
		Re: Plot and Plots By: Paul.Bowyer@gmail.com on Thu, 31 January 2008 13:53
		Re: Plot and Plots By: David Fanning on Thu, 31 January 2008 11:27

Previous Topic:	Re: Creating a dicom-file in HSV colors
Next Topic:	window size

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Oct 12 07:22:11 PDT 2025

Total time taken to generate the page: 1.20231 seconds