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Re: Over-PLOT() on MAP()? [message #74003 is a reply to message #73920]

Mon, 13 December 2010 11:23

Matt Haffner
Messages: 34
Registered: October 2000

Member

On Dec 11, 8:01 pm, Paulo Penteado <pp.pente...@gmail.com> wrote:
> On Dec 11, 10:55 pm, David Fanning <n...@dfanning.com> wrote:
>
>> I'm not sure this is a "limitation" so much as just
>> a poorly documented feature. I think it is absolutely
>> correct that the "data space" of a map projection should
>> be in projected XY coordinates, rather than in lat/lon
>> space. It is just about the only thing about the new
>> graphics that actually makes a lot of sense to me. :-)
>
> The problem in this case (and in imap) is that the projection can be
> changed (by the property map_projection), and the things put there by
> the plot do not get updated to the new position. One would have to get
> the new map structure, call map_proj_forward again, and update the
> plot data.

Yes, that is a serious limitation. I was hoping I was overlooking
something--thanks for the workaround. I resorted to using ELLIPSE for
now to get something going, but it's pretty slow (and probably has way
too much overhead) for a serious number of data points, even when
turning off .Refresh.

mh

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[Message index]

		Re: Over-PLOT() on MAP()? By: David Fanning on Sat, 11 December 2010 18:22
		Re: Over-PLOT() on MAP()? By: penteado on Sat, 11 December 2010 18:01
		Re: Over-PLOT() on MAP()? By: David Fanning on Sat, 11 December 2010 16:55
		Re: Over-PLOT() on MAP()? By: penteado on Sat, 11 December 2010 13:56
		Re: Over-PLOT() on MAP()? By: Matt Haffner on Mon, 13 December 2010 11:23

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