Mapper

Tool for mapping locations based on JSON input file.

Manipulating Shape Files

Download Data

# download map data
mkdir data
cd data/
wget 'http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_countries.zip'
unzip ne_110m_admin_0_countries.zip

Install Tools

# install tools
npm install -g shapefile
npm install -g topojson
npm install -g ndjson-cli

Manipulate Data

Convert binary .shp file to human readable newline-delimted GeoJSON so it's easier to work with from the command line:

shp2json ne_110m_admin_0_countries.shp | ndjson-split 'd.features' > countries.ndjson

Extract the fields we need:

cat countries.ndjson | ndjson-map '{type: d.type, properties: {name: d.properties.name, iso_code: d.properties.iso_a2, scalerank: d.properties.scalerank}, geometry: d.geometry}' > countries_min.ndjson

Filter out Antarctica

cat countries_min.ndjson | ndjson-filter 'd.properties.iso_code != "AQ"' > countries_min_fil.ndjson

Convert to TopoJSON to reduce file size

geo2topo -n countries_min_fil.ndjson > countries_topo.json