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Inverse Map Projection Help [message #58811]

Mon, 18 February 2008 17:47

mankoff
Messages: 131
Registered: March 2004

Senior Member

Hi Group,

I've read the previous posts on inverse map projections and the
lengthy tutorial by David Fanning, but still cannot get things to line
up quite right. So I'm posting here for help...

I have a data set (BEDMAP) with this information in the header:

ncols 1371
nrows 1371
xllcorner -3426225.75
yllcorner -3426225.75
cellsize 5000
NODATA_value -9999

And this information on the website:

Polar Stereographic projection with 71°S as the latitude of true scale
and 0°E as the central meridian.

I've managed to load the data, and inverse project it approximately
such that things roughly line up. But I cannot get it accurate where
my reference for 'accurate' is the /MAP_CONTINENTS, /HIRES keywords.

My goal is to inverse project it to an equilateral lat/lon grid
(something like what comes from /CYLINDRICAL) so I can generate an
image that would work in Google Earth.

I'm pleased to post the code I've written if necessary. If anyone has
any suggestions or familiarity with this data set I would appreciate
any tips.

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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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