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Re: West is Where!? [message #77753 is a reply to message #77660]

Tue, 20 September 2011 08:35

Vincent Sarago
Messages: 34
Registered: September 2011

Member

From IDL Help (MAP_PROJ_INIT),

LIMIT
Set this keyword to a four-element vector of the form

[Latmin, Lonmin, Latmax, Lonmax]
that specifies the boundaries of the region to be mapped. (Lonmin, Latmin) and (Lonmax, Latmax) are the longitudes and latitudes of two points diagonal from each other on the region's boundary.

Note: If the longitude range in LIMIT is less than or equal to 180 degrees, map clipping is performed in lat/lon coordinates before the transform. If the longitude range is greater than 180 degrees, map clipping is done in Cartesian coordinates after the transform. For non-cylindrical projections, clipping after the transformation to Cartesian coordinates means that some lat/lon points that fall outside the bounds specified by LIMIT may not be clipped. This occurs when the transformed lat/lon points fall inside the cartesian clipping rectangle.

Note: Lonmin should be in the range –180 to +180. Lonmax should be in the range –180 to +540, and must be greater than Lonmin. The total range for the map (Lonmax – Lonmin) must be 360 degrees or less.

So I'm not sur is possible when using the IDL graphic function ...

need to investigate more...

Vincent

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[Message index]

		West is Where!? By: David Fanning on Mon, 19 September 2011 21:14
		Re: West is Where!? By: Vincent Sarago on Tue, 20 September 2011 08:35
		Re: West is Where!? By: David Fanning on Tue, 20 September 2011 08:00
		Re: West is Where!? By: Paul Van Delst[1] on Tue, 20 September 2011 07:50
		Re: West is Where!? By: Vincent Sarago on Tue, 20 September 2011 02:36

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