Country Codes strategies

[mattrei]

Hi,
currently the country code data is in USDN format. However I could not find any JS library that handles those country codes. Is it possible to use more common codes like the ISO 3166-1 alpha 2 code
or ISO 3166-1 alpha 3 code (like it is used in the country-data npm package).

Thx for all the awesome work!

Best,
Matthias

[mbostock]

The codes are ISO 3166-1 numeric. You can generate a TSV of all the properties like so (attached):

shp2json -n build/ne_110m_admin_0_countries.shp | ndjson-map 'd.properties' | json2tsv -n

In fact, that seems useful enough that I’ve added them to world-atlas in release 1.1:

• https://d3js.org/world-110m.v1.tsv
• https://d3js.org/world-50m.v1.tsv

The files are essentially the same except that world/50m.tsv contains more rows for smaller features (e.g., the Pitcairn Islands) that are only present in world/50m.json.

If you like, you can join the above TSV files with an ndjson stream using ndjson-join. Or you can load the file in the client and join it there.

But, you might also consider building your own TopoJSON with the desired properties in it. if you don’t want to use ISO 3166-1 numeric, the easiest thing for you might be to edit the prepublish script and use a different property for the id, say, changing this:

ndjson-map '(d.id = d.properties.iso_n3, delete d.properties, d)'  

To this:

ndjson-map '(d.id = d.properties.iso_a3, delete d.properties, d)'  

Here’s an easy way to preview what properties are available from Natural Earth:

shp2json -n build/ne_110m_admin_0_countries.shp | ndjson-map 'd.properties' | less