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Re: Inverse Map Projection Help [message #58825 is a reply to message #58811]

Mon, 25 February 2008 06:56

mankoff
Messages: 131
Registered: March 2004

Senior Member

On Feb 24, 2:54 pm, Paul Levine <paul.lev...@ucla.edu> wrote:
> On 2008-02-22 09:48:38 -0800, mankoff <mank...@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

It does help. Image is better aligned. But still not accurate :(.

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[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

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