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 >
- References:
- Miscellaneous'WorldPlot'
- From: "Hanka Lakomá" <hana.lakoma@centrum.cz>
- Miscellaneous'WorldPlot'