generate.sh

#!/bin/bash
function usage
{
    echo "Usage: ./generate.sh "
    echo "  * -r | --resolution=<string> : Map resolution (10m, 50m, 110m) [default: 110m]"
    echo "  * -a | --skip-antarctica : Remove Antarctica from the map [default: false]"
    echo "  * -s | --include-states : Include States/Provinces lakes on the map [default: false]"
    echo "  * -l | --include-lakes : Include Great lakes on the map [default: false]"
    echo "  * -p | --include-projection : Embed projection into the topojson file"
    echo "  * -c | --clean : Remove all generated maps and downloaded assets"
    echo "  * -h | --help : Showing this useful message"
}

function clean
{
    rm -rf assets
    rm -rf json
    echo "Cleaned!"
}

# OPTIONS
RESOLUTION="110m"
SKIP_ANTARCTICA=0
INCLUDE_STATES=0
INCLUDE_LAKES=0
INCLUDE_PROJECTION=0

while [ "$1" != "" ]; do
    case $1 in
        -r | --resolution )        shift
                                   RESOLUTION=$1
                                   ;;
        -a | --skip-antarctica )    SKIP_ANTARCTICA=1
                                   ;;
        -p | --include-projection )INCLUDE_PROJECTION=1
                                   ;;
        -l | --include-lakes )     INCLUDE_LAKES=1
                                   ;;
        -s | --include-states )    INCLUDE_STATES=1
                                   ;;
        -c | --clean )             clean
                                   exit
                                   ;;
        -h | --help )              usage
                                   exit
                                   ;;
        * )                        usage
                                   exit 1
    esac
    shift
done

# STARTING HERE

if [ "$INCLUDE_STATES" -eq 1 ]; then
	BASEMAP="admin_1_states_provinces"
else
	BASEMAP="admin_0_countries"
fi

if [ "$INCLUDE_LAKES" -eq 1 ]; then
	BASEMAP="$BASEMAP""_lakes"
fi


BASEMAP_URL="http://naciscdn.org/naturalearth/""$RESOLUTION""/cultural/ne_""$RESOLUTION""_""$BASEMAP"".zip"

BASEMAP_DIR="assets/""$BASEMAP"
JSON_DIR="maps"
mkdir -p "$BASEMAP_DIR"
mkdir -p "$JSON_DIR"

if [ ! -d "./node_modules" ]; then
		echo "Installing npm packages"
        npm install
fi

if [ ! -f assets/sphere.json ]; then
	echo '{"type": "Sphere"}' > assets/sphere.json
fi

if [ ! -f "$BASEMAP_DIR""/""ne_""$RESOLUTION""_""$BASEMAP"".shp" ]; then
	echo "Downloading Basemap"
	curl -o "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP"".zip" "$BASEMAP_URL" --progress-bar
	unzip -q -d "$BASEMAP_DIR" "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP"".zip"
	rm -rf "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP.zip"
	rm -rf "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP.README.html"
	rm -rf "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP.VERSION.txt"
fi

# REMOVE UNOFFICIAL LANDS
if which ogr2ogr >/dev/null; then
    ogr2ogr -where "ISO_A2 != '-99'"  -lco "ENCODING=UTF-8" "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP""_clean.shp" \
        "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP"".shp"
else
    echo "ogr2ogr not found. Please install GDAL before executing this command.\nhttps://trac.osgeo.org/gdal/wiki/DownloadingGdalBinaries"
    exit
fi

if [ ! -f "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP""_wo_antarctica.shp" ]; then
    ogr2ogr -where "ISO_A2 != 'AQ'"  -lco "ENCODING=UTF-8" "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP""_wo_antarctica.shp" \
  	 "$BASEMAP_DIR""/ne_""$RESOLUTION""_""$BASEMAP""_clean.shp"
fi

if [ "$SKIP_ANTARCTICA" -eq 1 ]; then
	SHP_TO_USE="ne_""$RESOLUTION""_""$BASEMAP""_wo_antarctica"
else
	SHP_TO_USE="ne_""$RESOLUTION""_""$BASEMAP""_clean"
fi

if [ "$INCLUDE_PROJECTION" -eq 1 ]; then
    TOPOJSON_PARAMS="--projection='width = 960, height = 500, \
d3.geo.equirectangular().rotate([-11.0, 0.0, 0.0]).scale(width /(2 * Math.PI)).translate([width / 2, height / 2])' \
--width=960 --height=500"
    OUTPUT_SUFFIX="_projected"
else
    TOPOJSON_PARAMS=""
    OUTPUT_SUFFIX=""
fi

# Thanks Mike Bostock: https://gist.github.com/mbostock/c1c0426d50ca8a9f4c97
./node_modules/.bin/topojson --quantization 1e5 $TOPOJSON_PARAMS --id-property=ISO_A2 -p iso_a2=ISO_A2,iso_a3=ISO_A3,continent=CONTINENT,name=NAME -- countries="$BASEMAP_DIR/$SHP_TO_USE.shp" sphere=assets/sphere.json > assets/tmp.json
./node_modules/.bin/topojson-merge --io countries --oo land -o "$JSON_DIR/$SHP_TO_USE$OUTPUT_SUFFIX.json" -- assets/tmp.json
rm -rf assets/tmp.json