comp.lang.idl-pvwave archive: archive » Inverse Map Projection Help

Home » Public Forums » archive » Inverse Map Projection Help

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

Re: Inverse Map Projection Help [message #58830 is a reply to message #58811]

Sun, 24 February 2008 11:54

Paul Levine
Messages: 29
Registered: February 2008

Junior Member

On 2008-02-22 09:48:38 -0800, mankoff <mankoff@gmail.com> said:

>>
>>> Polar Stereographic projection with 71=B0S as the latitude of true scale
>>> and 0=B0E as the central meridian.
>
>
> ;; this is the projection the data is distributed on
> stereo = map_proj_init('Polar Stereographic', /GCTP, DATUM=8, $
> CENTER_LONGITUDE=0, CENTER_LATITUDE=-90)

You must change the CENTER_LATITUDE to -71

Polar stereographic projections are free of aereal distortion at only
one latitude, with aereal distortion increasing both north and south of
this latitude. In the case of your data, that latitude is 71 south.
FWIW, the northern-hemisphere sea ice data distributed by the NSIDC is
centered at 70 north.

HTH,
Paul

Report message to a moderator

[Message index]

		Inverse Map Projection Help By: mankoff on Mon, 18 February 2008 17:47
		Re: Inverse Map Projection Help By: mankoff on Mon, 25 February 2008 06:56
		Re: Inverse Map Projection Help By: David Fanning on Tue, 26 February 2008 04:43
		Re: Inverse Map Projection Help By: mankoff on Tue, 26 February 2008 18:12
		Re: Inverse Map Projection Help By: Paul Levine on Mon, 25 February 2008 12:11
		Re: Inverse Map Projection Help By: Paul Levine on Sun, 24 February 2008 11:54
		Re: Inverse Map Projection Help By: mankoff on Wed, 27 February 2008 16:09
		Re: Inverse Map Projection Help By: David Fanning on Tue, 26 February 2008 20:56

Previous Topic:	How to get file UNIT from file NAME?
Next Topic:	Re: How to get numbers into passed structure elements (pass-by-value/reference problem).

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 19:27:36 PDT 2025

Total time taken to generate the page: 1.60246 seconds