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#1 2018-12-28 05:34:43

Ben
Member
From: United Arab Emirates
Registered: 2006-05-23
Posts: 213

Differences in National Border Locations and Source

Hi,

I have been looking for the exact location of the border between the UAE and Musandam Oman.   Here is the location:

https://www.openstreetmap.org/#map=14/2 … 9&layers=C

The border line here, does not match with the border on Google Earth, which itself (and OSM's) border does not match with Google Maps.   So I have 3 answers.   The variation is over a mile (2km+) at one point, and a village as well as 2 peaks could belong to different countries, depending on the map used.

My question is, what is the source (or potential sources) of this data, and how can it be made more accurate, or proved that it is the correct of the three?  Who (in governments and/or international agreements) holds this type of information?

Edit:

To note, the borders from Google Earth and Google Maps seem to be displaying different data.  One is the border marking the edge of the Emirate of Ras al Khaimah, and 1 is the national border.  However, 1 of them must still be wrong, unless the thin slither between them belongs to another emirate.

https://www.google.com/maps/place/Ras+a … 55.9804173

Thanks

Last edited by Ben (2018-12-28 05:51:13)


Ben

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#2 2019-01-03 11:55:52

Ben
Member
From: United Arab Emirates
Registered: 2006-05-23
Posts: 213

Re: Differences in National Border Locations and Source

any suggestions on where to go with this question?


Ben

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#3 2019-01-03 13:55:38

SomeoneElse
Member
Registered: 2010-10-13
Posts: 1,068

Re: Differences in National Border Locations and Source

Ben wrote:

any suggestions on where to go with this question?

One option would be one of the English language mailing lists, another might be the International Boundaries subforum at https://forum.openstreetmap.org/viewtopic.php?id=64941 (either German or English will work there), and yet another might be to try and contact who created or edited one of the nodes that form the border.

https://www.openstreetmap.org/node/226947593/history and https://www.openstreetmap.org/node/226947586/history were created in https://www.openstreetmap.org/changeset/632404 11 years ago, so it's likely the sources available then were less accurate than those available now.  The user was active 2 months ago - you could try commenting on a changeset to see if they reply.

There are some other issues in the area as well - https://www.openstreetmap.org/node/1718026884 is a duplicate (with a dubious source too).

Online

#4 2019-01-03 20:50:18

ikonor
Member
Registered: 2010-11-08
Posts: 473
Website

Re: Differences in National Border Locations and Source

Ben wrote:

My question is, what is the source [...] of this data

In OSM, external data sources should be stated in the "source" Tag (at least in theory), either at the changeset or the object.

In this case, e.g. https://www.openstreetmap.org/way/21105236 has:

source 		CIA World database II
wdb:source	CIA World database II - asia-bdy.txt - segment 13

Searching the Wiki finds:
https://wiki.openstreetmap.org/wiki/Wik … Import_WDB
https://wiki.openstreetmap.org/wiki/Wik … bdy.txt.29

Looking at the history of the way
http://osmlab.github.io/osm-deep-history/#/way/21105236
and it's geometry changes - with the "Show More" button - shows that user Sal73x has done some refinements in the north in June 2014. No comment or source tag, so you might want to ask for the sources with a changeset comment.

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