Thursday, 13 March 2008

World borders for thematic web mapping

I've spend almost a week tweaking a world borders dataset. Since I need a dataset which I can use without restrictions, I had to dig into the public domain world. I found a proper dataset on the Mapping Hacks website. The original dataset was derived by Schuyler Erle from public domain sources, while Sean Gilles has done some clean up and enhancements.

The main changes I've done are:
  • Polygons representing one country/area are merged into one feature.
  • Added ISO 3611-1 Country codes (alpha-2, alpha-3, numeric-3).
  • Various feature changes to make the dataset more compatible with ISO 3611-1.
  • Added region and sub-region codes from UN Statistical Division.
  • Added longitude/latitude values for each country.

More information on this page and in the "readme.txt" file provided with the dataset. You can download the the dataset in two resolutions. I recommend the simplified version for thematic web mapping.

The dataset could be further optimised by removing small island polygons that are not individual countries.

Download and enjoy!

26 comments:

  1. Beau Gunderson17 March 2008 at 07:41

    Fantastic work! I've been looking for a world border dataset like this for a LONG time.

    ReplyDelete
  2. Ignatius Indiligentius20 March 2008 at 21:46

    Congratulations for your blog!

    I can not open your shape file. I use Linux and this is the out screen

    $ unzip TM_WORLD_BORDERS-0.1.zip
    Archive: TM_WORLD_BORDERS-0.1.zip
    End-of-central-directory signature not found. Either this file is not
    a zipfile, or it constitutes one disk of a multi-part archive. In the
    latter case the central directory and zipfile comment will be found on
    the last disk(s) of this archive.
    unzip: cannot find zipfile directory in one of TM_WORLD_BORDERS-0.1.zip or
    TM_WORLD_BORDERS-0.1.zip.zip, and cannot find TM_WORLD_BORDERS-0.1.zip.ZIP, period.

    Is your shape ok?

    Thank you

    ReplyDelete
  3. Bjørn Sandvik20 March 2008 at 22:25

    The shapefiles should be ok, but they are zipped on a windows computer using 7-Zip (www.7-zip.org). I'm not familiar with the unzip Linux command.

    ReplyDelete
  4. Unknown23 March 2008 at 19:25

    Great work !
    I can't open the zip file (on 7zip and windows) ; I download the file 3 times and it was never possible...
    Perhaps you should reload the zip into your blog
    Many thanks in advance

    Sebastien VIAL
    GIS teacher

    ReplyDelete
  5. Bjørn Sandvik1 April 2008 at 16:42

    Hi,
    New zip archives are now available on this page.

    ReplyDelete
  6. Bjørn Sandvik3 May 2008 at 10:34

    Use link above.

    ReplyDelete
  7. Anonymous5 May 2008 at 17:12

    Whatever the nuances of copyright/database law in your area, can I assume you intend this dataset resulting from your modifications to be in (or essentially) also in the public domain? The Readme file is a bit unclear on this topic.

    ReplyDelete
  8. Bjørn Sandvik5 May 2008 at 17:34

    This dataset is available under a Creative Commons Attribution-Share Alike License. I will add this information to the Readme-file.

    ReplyDelete
  9. Unknown14 May 2008 at 03:33

    Bjorn,

    Thanks for this great contribution. Using your data there's now a Mapnik tutorial here that creates a simple thematic map of world population: http://trac.mapnik.org/wiki/XMLGettingStarted#WorldPopulationXML

    I'm curious if you have given thought to reprojection issues with this dataset? I'd like to use it for tutorials involving reprojection but it appears that the use of multipolygons can cause havoc near the dateline. This does not happen with the world_borders.shp from mapping hacks.

    For an example of this try:

    ogr2ogr -t_srs http://spatialreference.org/ref/user/north-pacific-albers-conic-equal-area/ TM_WORLD_BORDERS_SIMPL_pacific_albers.shp TM_WORLD_BORDERS_SIMPL-0.2.shp

    ReplyDelete
  10. Bjørn Sandvik15 May 2008 at 14:09

    Hi Dane,

    Good to see that this dataset is used in an open source project.

    I've not given thought to reprojection issues width this dataset. I think you're right about multipolygons, - being on both side of the dateline might cause some problems for some projections. Maybe splitting multipolygons that cross the dateline will solve your problem?

    Please notify me if you're able to find a solution.

    ReplyDelete
  11. Anonymous8 July 2008 at 16:55

    There is a small (but funny) bug in the dataset.

    The "United Arab Emirates" are mistyped as "Untied Arab Emirates", at least in version 0.2 (which is what i'm using right now).

    ReplyDelete
  12. Bjørn Sandvik30 July 2008 at 13:01

    Version 0.3 of the world borders dataset is now available. See changelog in Readme.txt

    ReplyDelete
  13. Unknown5 August 2008 at 20:50

    Hello again,

    A few more items to report:

    1) There is now a 'Hello World' GeoDjango application using your data available at:

    http://code.google.com/p/geodjango-basic-apps

    2) I've yet to look closely at the reprojection issue, but when I do I'm also going to look more closely at the invalid antarctica polygon issue described here:

    http://www.nabble.com/modifying-XMLGettingStarted-to-output-in-mercator-projection--tt17664268.html#a17664268

    Of course if anyone else digs into the issue please post here!

    Cheers, Dane

    ReplyDelete
  14. Roel28 September 2008 at 20:42

    Hi Bjorn,

    The downloadlink isn't working anymore. Could you provide some help?

    Thanks!

    rOEL

    ReplyDelete
  15. Bjørn Sandvik29 September 2008 at 08:14

    Hi rOEL,

    The download link seems to work here.

    ReplyDelete
  16. Anonymous18 February 2009 at 12:37

    Hi all,
    Sorry if I'm wrong here, but I've noticed that some of the population estimates seem to be a factor of 10 out.... This is not necessarily an exhaustive list but countries I've identified are Italy, Colombia, Saudi Arabia, Niger, Mali, Ghana and Senegal. You can correct the populations in R using correctid <- c(86,38,177,126,113,69,183) and correctpop <- c(58093000,45600000,24573000,13957000,13518000,22113000,11658000). I've taken the figures from http://en.wikipedia.org/wiki/List_of_countries_by_population_in_2005

    ReplyDelete
  17. Unknown24 February 2009 at 21:34

    How up-to-date are the political boundaries? Circa 2008, or earlier?

    Thanks,

    Sara

    ReplyDelete
  18. Knut21 April 2010 at 13:50

    This is great work indeed, Bjørn.

    Could you explain how you went about the simplification to get it from 3.3 MB to 226 KB?

    ReplyDelete
  19. Bjørn Sandvik22 April 2010 at 07:44

    Hi Knut,

    The simplification process is described in this document (PDF).

    Bjorn

    ReplyDelete
  20. Knut23 April 2010 at 15:22

    Very helpful - thanks a lot!

    ReplyDelete
  21. Sherwin13 June 2011 at 07:25

    Hi Bjorn!

    Thanks a lot for this! It's very helpful to my project for my client. :)

    I have a problem though, can you divide Sudan to "Sudan" and "South Sudan"? I need South Sudan in the list of countries.

    http://en.wikipedia.org/wiki/Southern_Sudan

    Can you also add Alderney or at least combine it with Guernsey to form Guernsey and Alderney?

    http://en.wikipedia.org/wiki/Alderney

    I'm using the simple one by the way. :)

    Thank you very much!

    ReplyDelete
  22. Bjorn28 October 2011 at 08:55

    This dataset is no longer maintained. You'll find the same data on www.naturalearthdata.com.

    Bjorn

    ReplyDelete
  23. Anonymous20 January 2012 at 11:07

    Hi! I used your map, but I noticed that "Occupied Palestinean Territory" miss in the file ".dbf".
    Can you fix this problem?
    I apologize for my bad English.

    Thanks

    ReplyDelete
  24. Anonymous18 February 2012 at 10:13

    World boundaries contain invalid character in the record: 141;NULL;AX;ALA;248;[invisible invalid character]land Island;0;0;150;154;19.952;60.198 This bug inhibit importing this shp as UTF-8 to postgis. Moreover some coordinates seems to be out of extent: ERROR: Coordinate values are out of range [-180 -90, 180 90] for GEOGRAPHY type
    LINE 1: ...','Antarctica','0','0','0','0','21.304','-80.446','010600002...
    All the best,
    Jan

    ReplyDelete
  25. Morten Myksvoll1 September 2014 at 14:55

    Thank you for a great map! If I may, I'd like to ask for a version where Kosovo is separated from Serbia, as 108 UN-countries, including my own, recognize its independence.

    Also, it is relevant for my use of the map, as my data separates the two entities.

    South Sudan is also a country that I'd like to see in this map, as it is a member state of the UN.

    ReplyDelete
  26. Bjørn Sandvik1 September 2014 at 16:36

    Morten: the dataset is no longer maintained. You'll find the same data on naturalearthdata.com

    ReplyDelete