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Re: Map Projection Clarification [message #87613 is a reply to message #87612]

Tue, 18 February 2014 13:06

Phillip Bitzer
Messages: 223
Registered: June 2006

Senior Member

Hi Morgan-

On Tuesday, February 18, 2014 2:42:25 PM UTC-6, Morgan Silverman wrote:

> I'm trying to set up a map projection using
>
> mapCoord = Obj_New('cgMap', 'Lambert Conformal Conic', Ellipsoid='WGS 84', /GCTP, limit=limit, $
>
> position=plotPosition, center_latitude=38.5, center_longitude=-77.5, STANDARD_PAR1=40, STANDARD_PAR2=-39). I honestly am just following examples I've seen but don't understand what each piece means and can't for the life of me find answers anywhere. At the moment I'm just getting a white screen when using mapCoord compared to cgMap_set.

Well, since you're using objects, you have to get into a slightly different mindset. The OBJ_NEW() command simply _initializes_ the object. You still have to draw it:

mapCoord->Draw

This invokes the Draw method of the object.

> Is there a list of different ellipsoid options to use?

According to the documentation for cgMap (https://www.idlcoyote.com/idldoc/maps/cgmap__define.html), it is basically a wrapper for MAP_PROJ_INIT : http://exelisvis.com/docs/MAP_PROJ_INIT.html

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[Message index]

		Map Projection Clarification By: morganlsilverman on Tue, 18 February 2014 12:42
		Re: Map Projection Clarification By: Phillip Bitzer on Tue, 18 February 2014 13:06
		Re: Map Projection Clarification By: morganlsilverman on Tue, 18 February 2014 13:25
		Re: Map Projection Clarification By: David Fanning on Tue, 18 February 2014 13:31
		Re: Map Projection Clarification By: David Fanning on Tue, 18 February 2014 16:25
		Re: Map Projection Clarification By: David Fanning on Tue, 18 February 2014 16:34
		Re: Map Projection Clarification By: morganlsilverman on Tue, 18 February 2014 16:39

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