If you had the proper projection on a flat map, you could do it with radii.
You would need the azimuthal equidistant projection. This projection
horribly distorts the shapes & sizes of the land masses, but the straight
line distances are true.
Anyone figure it out yet? I'm inching to know.
Based on the author's geographic bias (as well as mine), and looking at some
distances on my globe (with my wooden ruler and without actually drawing on
it) I would guess it is somewhere in the central US, somewhere in the
triangle between Dallas, Denver, and Chicago.
Kent Hargesheimer
SRC - Extending the Reach of Micromarketing
603 Chadfield Way NE
Leesburg, VA 20176-4823
tel 703.737.7739 fax 703.737.7719
email [EMAIL PROTECTED]
website http://www.extendthereach.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Van der
Lugt, Peter
Sent: Monday, April 23, 2001 2:37 PM
To: '[EMAIL PROTECTED]'; [EMAIL PROTECTED];
[EMAIL PROTECTED]
Subject: RE: MI-L A Mapping Puzzle for Savants
This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
The most accurate measurement from a globe would be using Great Circles
drawn from the given cities. The large distances from each city on a
projected map are going to lead to some fairly large inaccuracies. But, I
suppose if the city that is the answer is isolated enough, perhaps this
would allow you to venture a guess.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]
Sent: Monday, April 23, 2001 1:19 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: MI-L A Mapping Puzzle for Savants
Bill,
Perhaps the easiest way would be to map using circles and a world map.
Find the map scale,
use a compass, and draw circles of the radius in miles indicated on the
map. Do that for
all the cities, and you'll figure out that the point is wherever all the
circles intersect.
Jonathan Watson
-----Original Message-----
From: bthoen [mailto:[EMAIL PROTECTED]]
Sent: Monday, April 23, 2001 1:30 PM
To: MapInfo-L
Cc: bthoen
Subject: MI-L A Mapping Puzzle for Savants
Here's an interesting mapping problem that was in this Sunday's
"Ask Marilyn" (newspaper) column.
Say you come upon a sign that says the following:
Paris 4658 miles
Moscow 5438 miles
Tel Aviv 6681 miles
Hong Kong 7878 miles
Sydney 8746 miles
Johannesburg 9092 miles
How would you determine where the sign is located?
Marilyn's hint:
"There's at least one easy way to determine the location of the
sign. Can you find it, kids? Send your solutions to
[EMAIL PROTECTED] We'll publish the earliest, simplest,
clearest reply that requires no sophisticated equipment (such as
online databases)."
Well, rats... that rules out using the sophisticated MapInfo!
It's not hard to get an approximate answer with MapInfo, but
intersecting buffers don't work well. Buffers are unreliable over
long distances? And obviously, she's looking for a simpler
solution, right?
I don't know "the" answer (but I think I have a pretty good
guess.) Her answer will be in next Sunday's paper (in the Parade
Magazine insert in any big US paper.)
- Bill Thoen
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