Comments on: World Country Borders

By: Liam

Liam — Thu, 05 Jan 2012 19:56:33 +0000

Northern Ireland is part of the United Kingdom by the way

By: Anonymous

Anonymous — Thu, 06 Oct 2011 17:23:36 +0000

i want latitude & longitude of india border, can u please help me.

By: StarTraX

StarTraX — Sat, 23 Jul 2011 05:33:04 +0000

Fantastic resource. Beautifully prepared and presented. Any chance of getting it updated? Yugoslavia and East Timor are long overdue, and just recently South Sudan.

By: Lisa

Lisa — Wed, 17 Nov 2010 13:54:39 +0000

I get the borders but no pop up flag!!

By: Kevin

Kevin — Tue, 15 Jun 2010 21:10:31 +0000

I wrote a simple c++ program to reduce the points.

First it calculates the outline length for each polygon and if it is really small then it discards the polygon. This helps throw away really small islands like in northern Canada.

Next it reduces the point count by using a really simple formula.

For each polygon, it iterates through the points in the polygon and calculates the triangle area of each set of 3 points in the polygon. It keeps track of the 3 points with the smallest area. If the area is below a certain threshold (which you can tune to generate more of less detail) then it throws away the middle point and if there are still more than 6 points it repeats again, otherwise it has finished reducing that polygon and goes onto the next.

By: Naso

Naso — Thu, 29 Apr 2010 05:47:36 +0000

@Kevin

Hi Kevin,

I was wandering if you could share what tool you used to reduce the number of points. I had a look at your example and the precision you’ve achieved is exactly what i need. My question may sound stupid but I am a newbie with the maps.

Scored no mistakes in Europe and 3 in Asia – those small islands are tricky

Cheers,

Naso.

By: Kevin

Kevin — Tue, 30 Mar 2010 22:57:57 +0000

I further reduced this data-set down to 17,000 points and you can see it in an online Map Quiz that I wrote that uses the new HTML5 canvas tag. (Doesn’t work in IE). Thanks for all your hard work!

http://www.scale18.com/canvas4.html

Enjoy,
Kevin

By: topomatt

topomatt — Tue, 26 Jan 2010 03:12:45 +0000

@Kryptic The borders have been greatly simplified to make it reasonable size file. This is not really intended to be used close up.

By: Kryptic

Kryptic — Mon, 25 Jan 2010 08:09:50 +0000

Thanks for kml. But borders are not exactly mapped when seen from GE
like this point 49.280200,-123.118220 (lat,long) is located inside Canada but in your kml file this point doesn’t come inside any border.