Talk:Quadripoint

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what about Russia, Mongolia,China Kazakhstan border?


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[edit] Explanation of origin of this article

This article still needs a lot of work. I am planning to write an article tripoint and then come back to quadripoint and fix it up. By way of explanation, this article began as a translation by me of the Dutch article nl:Vierlandenpunt. However, I don't know any Dutch; I just ran it through a machine translator and then figured it out based on similarity to English and German. One thing I realized is that the Dutch word "Vierlandenpunt" is not the same thing as the English word "quadripoint": a Vierlandenpunt is literally a four-country point, while a quadripoint can be four subnational units (e.g. the U.S. Four Corners). In German, the word is "Vierländereck" meaning "four-country corner"; not quite the same thing as "four-country point" but close.

Among other things the images in this article need to be fixed up but I am hopeless at stuff like that. No need for such a large image of Lake Chad, but it needs to be large enough to see that within the lake are two tripoints rather than a single quadripoint. It would be great to have this image from the Dutch wiki. Also there must be photos of the Sweden/Norway quadripoint mentioned in the article. There's a monument at the Manitoba/Saskatchewan/NWT tripoint which may have become a quadripoint with Nunavut (see article); three photos are on this page. Also I like this photo even though it's a bit out of focus.--Mathew5000 21:57, 20 June 2006 (UTC)

[edit] three regions meet at a point...

"three regions meet at a point on the line...": sorry, if a house has four rooms that meet at a point, there are still four corners, even if not all 90 degrees. So explain your point better. --User:Jidanni 2006-10-29

Here's what I mean. There are four countries meeting at a single point, but only three corners, not four:
thumb‎
--Mathew5000 20:38, 10 November 2006 (UTC)
It's a fair point but a bit pedantic for the intro. I've relegated it to a footnote, if that's ok. I don't see any other way you can have a quadripoint without four corners. jnestorius(talk) 02:40, 11 November 2006 (UTC)
The footnote is fine. But there are definitely other ways you could have a quadripoint without four corners. For example, if two of the countries are shaped like ellipses, tangent to one another. Then there is a quadripoint with only two corners. But yeah I agree this is quite pedantic:
Image:Four countries two corners.PNG
--Mathew5000 04:14, 13 November 2006 (UTC)
Indeed. Just about conceivable for one country to define part of its border along a circle of latitude and another to do so along a tangential great circle. If and when that happens, it should definitely take pride of place in the intro para :) jnestorius(talk) 21:49, 13 November 2006 (UTC)

[edit] Marine quadripoint

Oceania political boundaries
Oceania political boundaries

Looks to me like some kind of borders of Solomon Islands, Tuvalu, Kiribati, Nauru all meet at a point. Going by the various articles, these are not the territorial waters; are they the Exclusive Economic Zone? It might be worth mentioning in any case. jnestorius(talk) 19:47, 10 November 2006 (UTC)

Apparently these lines are cartographic conveniences with no legal basis quadripoint in the Pacific- No!. jnestorius(talk) 21:45, 13 November 2006 (UTC)

[edit] Non-quintipoint in Colorado

The external link Local Curiosities has a sister page USA County curiosities which lists a possible quintipoint involving 3 counties of Colorado: Jefferson, Boulder and Broomfield. This large scale map suggests that where the SW fragment of Broomfield meets the main body, you have (clockwise from north-west) Boulder-Bloomfield(main)-Jefferson(pincer#1)-Bloomfield(fragment)-Jefferson(pincer#2). However, these detailed maps from the Bloomfield site north-east of quintipoint and south-west of quintipoint suggest either the fragment is an exclave, or it is linked to the parent by a corridor. (Or possibly by an infinitely thin line? Can they do that??) Anyway, no quintipoint. jnestorius(talk) 00:58, 16 January 2007 (UTC)

[edit] United Kingdom: Four Shire Stone

Before 19th century tidying up of local boundaries, the stone did mark the convergence of four counties: Oxfordshire, Warwickshire, Gloucestershire, and a detached portion of Worcestershire. FGB —The preceding unsigned comment was added by FatGravyBoat (talk • contribs) 10:24, 15 February 2007 (UTC).

[edit] United Kingdom: Cambs/Lincs/Northants/Rutland quadripoint

I'm not sure about this one. I've looked at the relevant OS 1:50,000 map (sheet 141) and it seems to show a Rutland/Lincs/Northants tripoint and a Lincs/Cambs/Northants tripoint about 600m apart, with a 2-300m wide 'tongue' of Lincolnshire keeping Rutland and Cambridgeshire(Peterborough UA) apart. FatGravyBoat 10:33, 15 February 2007 (UTC)FatGravyBoat

[edit] Names

Tetrapoint redirects here should we mention this usage?

Since we have trillion, quadrillion, quintillion, sextillion etc, would five or more areas joining at a point logically be called, 5-quintipoint/pentapoint 6-sextipoint/hexapoint 7-septapoint/heptapoint 8-octopoint 9-nonopoint/enneapoint 10-decapoint etc.

Octopoint is mentioned. Am I talking rubbish or are these ever used? Carlwev (talk) 17:55, 24 February 2008 (UTC)

[edit] Jungholz is not a quadripoint

According to the several maps and sat images available in Map sources/GeoHack at the coordinates for Jungholz, at a high zoom it shows the area does not form a quadripoint although it is close. see here 47°33′20″N 10°27′17″E / 47.5555, 10.4546

Carlwev (talk) 12:59, 27 February 2008 (UTC)

Googlemaps et al are excellent in their way but not perfect. Borders are represented as layered overlays onto other GIS data. They may get confused by a quadripoint if the programmer hasn't worried about handling such anomalies. Layers may be slightly misaligned if different GIS datasets are based on different coordinate systems. To allay your doubts, check this site which has photos, maps and extracts from the original 1844 and 1850 treaties between the Kingdom of Bavaria and the Austrian Empire which established the quadripoint. jnestorius(talk) 15:22, 27 February 2008 (UTC)