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justincy/Penydarren.geojson

Created February 27, 2014 15:22
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Penydarren.geojson
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}
Raw
simplify.js
var fs = require('fs'),
mapshaper = require('mapshaper'),
argv = require('optimist')
.default('i', 500)
.argv;
if(argv._.length !== 2){
console.log('Usage: node simplify.js <input.geojson> <output.geojson>');
process.exit();
}
var data = fs.readFileSync(argv._[0]),
geoJSON = JSON.parse(data);
fs.writeFileSync(argv._[1], JSON.stringify(simplfyGeometry(geoJSON, parseInt(argv.i))));
function simplfyGeometry(origGeom, interval) {
if(origGeom.type == 'Point') return origGeom;
var mapGeom = mapshaper.createTopology(mapshaper.importGeoJSON(origGeom));
mapshaper.simplifyPaths(mapGeom.arcs, 'vis');
mapGeom.arcs.setRetainedInterval(interval);
mapshaper.findAndRepairIntersections(mapGeom.arcs);
return mapshaper.exportGeoJSONObject(mapGeom.layers[0], mapGeom.arcs).geometries[0];
}
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