Function addCentroidsToGeojson

topojson/bin/process_geodata.mjs:48–60

(geojsonPath)

}

function addCentroidsToGeojson(geojsonPath) {
    const geojson = getJsonFile(geojsonPath);
    if (!geojson.features) return;

    const features = geojson.features.map((feature) => {
        const centroid = getCentroid(feature);
        feature.properties.ct = centroid;

        return feature;
    });

    fs.writeFileSync(geojsonPath, JSON.stringify({ ...geojson, features }));
}

// Wind the polygon rings in the correct direction to indicate what is solid and what is whole
const rewindGeojson = (geojson, clockwise = true) => rewind(geojson, clockwise);