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MathGroup Archive 2002

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WorldGraphics Question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33659] WorldGraphics Question
  • From: "pr0phet73" <xxxpr0phet73xxx at att.net>
  • Date: Thu, 4 Apr 2002 19:40:51 -0500 (EST)
  • Organization: University of Utah
  • Sender: owner-wri-mathgroup at wolfram.com

Folks-

I am trying to use Mathematica to write a small program that will plot up
the foci of a large number of earthquakes on a world map.  I have been
working through the examples given in the Add-ons section of the help
browser on WorldGraphics and have come upon the following problem:

When I plot up a map of Africa (as per the example in Add-ons):
afmap = WorldPlot[Africa,

WorldBackground -> GrayLevel[0.7],

WorldGrid -> None,

WorldFrame -> Thickness[.012],

WorldProjection -> LambertCylindrical]


I can add a line as in the example:

{capetown, cairo} = ToMinutes[

{{{-33, -56}, {18, 22}},

{{30, 3}, {31, 15}}}]



Show[{afmap,

WorldGraphics[

{Dashing[{0.05, 0.03}],

Line[{capetown, cairo}]}]}]


But if I try to plot circles at the points of the two cities:

Show[{afmap,

WorldGraphics[

{Circle[cairo, 500], Circle[capetown, 500]}]}]


The circles are clearly not located where they should be.  Any ideas as to
what I am missing here?


--
M. G. BARTLETT
Note: Remove x's from email address when replying







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