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Re: surface plotting [message #37630]

Wed, 14 January 2004 09:21

Norbert Hahn
Messages: 46
Registered: May 2003

Member

Muks Raju <mpraju@harvest.eecs.umich.edu> wrote:

> Hello
> Yes you are right. I would like to picture the sphere as the earth
> and then project the colors which rep the diff densities on that earth. I
> guess I understand the concept but my data is in such a wierd form.
> I have a vector X = [X1,X2,X3.....X4880] and Y = [y1,y2,..y4880] and
> Z=[Z1,z2..z4880] and data=[d1,d2...d4880].. with the data in this format
> how do i do the said transformation? Any help would be much appreciated.

The transformation requires more than one step. CV_COORD will convert your
coordinates contained in x,y,z to longitude, latitude (and radius).

sph_coord = CV_COORD ( FROM_RECT=[x,y,z], /TO_SPHERE )

The longitude is contained in sph_coord (0,*), the latitude is in
sph_coord(1,*). The radius will not be used for map projections.
Ideally sph_coord(2,*) should contain the same values.

Next use MAP_SET to establish the map projection you want to use. Calling
MAP_SET without any parameters will establish a default projection. After
that IDL assumes all coordinates following are longitude, latitude and data.

CONTOUR will plot your data. The keyword IRREGULAR should be set. You may
need to read the online help for each routine you call.

Norbert

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[Message index]

		Re: surface plotting By: Norbert Hahn on Wed, 14 January 2004 09:21
		Re: surface plotting By: Muks Raju on Tue, 13 January 2004 12:41
		Re: surface plotting By: Norbert Hahn on Tue, 13 January 2004 07:47

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