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Beyond Four Corners, USA

Greg Hurst
Posted 9 years ago
POSTED BY: Greg Hurst
16 Replies
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I found your work extremely useful as I was writing a paper on coloring maps where quadripoints (and more) are considered as adjacencies. My paper with Tilley and Eric Weisstein is at < https://arxiv.org/abs/2409.11249 > and was just accepted by Utilitas Mathematica. We included a picture of the Mt Etna story. But I was never able to find a map of 10 towns in Ireland that share a point at a summit. Edit: The paper has been published at Utilitas Mathematica paper.
POSTED BY: Stan Wagon

I think the mountain in Northern Ireland is called Knocklaid, and is located north of Antrim, relatively close to Ballycastle, which is on the northern coast. The borders that meet on the mountain are between "townlands", a very small admin unit (40-200 ha). There are about 9.500 in Northern Ireland.
POSTED BY: Per Milberg

Maps with border of Norther Ireland are available here: https://apps.spatialni.gov.uk/PRONIApplication/
POSTED BY: Per Milberg
Attachments:
NIrelandMap.nb
POSTED BY: Stan Wagon
Greg Hurst
Greg Hurst
Posted 3 months ago

Thanks for sharing your paper. I’ll be sure to take a close look. It sounds like a very nice contribution.
POSTED BY: Greg Hurst
POSTED BY: Per Milberg
POSTED BY: Vitaliy Kaurov
Greg Hurst
Greg Hurst
Posted 4 years ago

I think the issue is that ChildrenMultiPoints needed a second argument. I edited the post to give a default value of 4. The following now returns a 10-point and a quadripoint:

ChildrenMultiPoints[Entity["AdministrativeDivision", {"Catania", "Sicily", "Italy"}]]

enter image description here

Does this work for you now?
POSTED BY: Greg Hurst

I've always loved finding geographic oddities. This was fun to read, thanks Chip.

POSTED BY: Douglas Smith

Very nice post, with interesting results.
POSTED BY: Thibaut Jonckheere
Dave Middleton
Dave Middleton
Posted 9 years ago

Interesting and fun topic. Well explained and worked out. Thank you.
POSTED BY: Dave Middleton

Wonderful! First class job! One of the best posts I've seen here!
POSTED BY: Rand Baldwin
John Snyder
John Snyder
Posted 9 years ago

I visited the four corners area of the USA a few months ago. It isn't close to anything, so you really have to want to see it to make the trip. Couples who go usually have their picture taken kissing at the four corner point. Native Americans sell their wares along the circumference of a large circle surrounding the four corners.

This is a great post and I really enjoyed it very much. Thanks for a terrific job!!!
POSTED BY: John Snyder

Just logged in to give it a thumbs up! Very nice! Great work!
POSTED BY: Sander Huisman
Greg Hurst
Greg Hurst
Posted 9 years ago

Thanks!
POSTED BY: Greg Hurst

enter image description here - another post of yours has been selected for the Staff Picks group, congratulations !

We are happy to see you at the top of the "Featured Contributor" board. Thank you for your wonderful contributions, and please keep them coming!
POSTED BY: EDITORIAL BOARD
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