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Map Projection Clarification [message #87612]

Tue, 18 February 2014 12:42

morganlsilverman
Messages: 46
Registered: February 2013

Member

Hello,

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. I'm creating a filled contour plot of lat/lon data.

Is there a list of different ellipsoid options to use? I see people use 24, 19, etc but I can't find what those correspond to. I know I need to use the same ellipsoid as what the data I have was created with, but I don't know how to relate that to options in IDL. Also, is there a list somewhere of GCTP map projections use in IDL? Lastly, what are standard_par2 and standard_par2. I know they're some sort of defined parallels but I don't know how to choose what those are? Could someone please explain those settings to me.

Thank you,

Sincerely,
Morgan

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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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