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Re: Miscellaneous'WorldPlot'
*To*: mathgroup at smc.vnet.net
*Subject*: [mg56087] Re: [mg55870] Miscellaneous'WorldPlot'
*From*: Omega Consulting <info at omegaconsultinggroup.com>
*Date*: Fri, 15 Apr 2005 04:47:27 -0400 (EDT)
*References*: <200504080536.BAA25173@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
I didn't see a response to this, so here's mine.
WorldPlot is simply being fussy. It is complaining because the result
of the projection is symbolic, not numerical. Wrapping your projection
in N does the trick.
<<Miscellaneous`WorldPlot`
WorldPlot [Europe,
WorldRange->{{-90,90},{-90,90}},
WorldProjection->(N[{2*Cos[#1*Pi/10800]*Sin[#2*Pi/10800]/
(1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800]),
2*Sin[#1*Pi/10800]/
(1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800])}]&)]
----------------------------------------------
Omega Consulting
The final answer to your Mathematica needs.
http://omegaconsultinggroup.com
On Apr 8, 2005, at 12:36 AM, Hanka Lakomá wrote:
> Dear Group,
> I try to get a map in stereographic projection in transverse position
> (the centre of the map is point 0°latitude, 0°longitude).
> I have cartographic equations of this projection in wanted position.
> So I put them to WorldProjection:
>
> Miscellaneous'WorldPlot'
> WorldPlot [Europe,
> WorldRange->{{-90,90},{-90,90}},
> WorldProjection->({2*Cos[#1*Pi/10800]*Sin[#2*Pi/10800]/
> (1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800]),
> 2*Sin[#1*Pi/10800]/
> (1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800])}&)]
>
> and I get from Mathematica 4.2:
> WorldGraphics::"badproj" :
> The projection function {....,...} did not return a valid coordinate...
>
> If I change Europe for another possible continent or state it gives
> the same type of error...
> If I change WorldRange for another possible it gives the same type of
> error...
> Is a problem in projection function and Why? I know from cartography
> textbooks that equations are correct...
> Any help would be appreciated.
> Thank you for your time and consideration.
> Hanka
>
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