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difference.ts
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difference.ts
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'use strict';
import tileReduce from '@mapbox/tile-reduce';
import { Feature, FeatureCollection } from '@turf/helpers';
import fs from 'fs';
import minimist from 'minimist';
import path from 'path';
import fileExists from './file-exists';
const options = minimist(process.argv.slice(2));
const roads = options._[0];
const buffers = options._[1];
console.log(`Roads: ${path.resolve(roads)}`);
console.log(`OSM Buffers: ${path.resolve(buffers)}`);
if (fileExists(roads, buffers) !== true) process.exit(1);
const directory =
typeof options['output-dir'] !== 'undefined'
? path.resolve(options['output-dir'])
: path.dirname(roads);
const collectionNotWithin: FeatureCollection = {
type: 'FeatureCollection',
features: []
};
const stats: any[] = [];
try {
tileReduce({
sourceCover: 'road',
log: true,
map: path.resolve(__dirname, 'difference/buffer.js'),
sources: [
{
name: 'buffer',
mbtiles: buffers,
layers: ['buffers']
},
{
name: 'road',
mbtiles: roads,
layers: ['roads']
}
]
})
.on(
'reduce',
(result: {
stats: Array<{
tile: [number, number, number];
roads: number;
buffers: number;
notWithin: number;
}>;
featuresNotWithin: Feature[];
}) => {
stats.push(result.stats);
if (result.featuresNotWithin !== null) {
collectionNotWithin.features = collectionNotWithin.features.concat(
result.featuresNotWithin
);
}
}
)
.on('end', function () {
fs.writeFileSync(`${directory}/stats.json`, JSON.stringify(stats));
const file = path.resolve(directory, 'diff.geojson');
const stream = fs.createWriteStream(file);
stream.write('{"type":"FeatureCollection","features":[\n');
collectionNotWithin.features.forEach((feature, index: number) => {
stream.write(JSON.stringify(feature));
if (index < collectionNotWithin.features.length - 1) {
stream.write(',\n');
}
});
stream.write('\n]}');
stream.end();
console.log('Features count: %d', collectionNotWithin.features.length);
console.log(`Result: ${file}`);
});
} catch (err) {
console.error(err);
process.exit(1);
}