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