s2-tools/dist/readers/gtfs/schedule/shapes.js

A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.

import { parseCSVAsRecord } from '../../';
/**
 * @param input - the input string to parse from
 * @returns - an array of Agencies
 */
export function parseGTFSShapes(input) {
    const data = parseCSVAsRecord(input);
    // 1) Group data by shape_id
    const groups = {};
    data.forEach((d) => {
        const { shape_id, shape_pt_lat, shape_pt_lon, shape_pt_sequence } = d;
        if (groups[shape_id] === undefined)
            groups[shape_id] = [];
        groups[shape_id].push({
            id: shape_id,
            lat: parseFloat(shape_pt_lat),
            lon: parseFloat(shape_pt_lon),
            sequence: parseInt(shape_pt_sequence, 10),
        });
    });
    // 2) for each shape_id group, sort data by shape_pt_sequence geometry
    const features = {};
    for (const [shapeId, shapes] of Object.entries(groups)) {
        shapes.sort((a, b) => a.sequence - b.sequence);
        features[shapeId] = {
            type: 'Feature',
            geometry: {
                type: 'LineString',
                coordinates: shapes.map((s) => [s.lon, s.lat]),
            },
            properties: { id: shapeId },
        };
    }
    return features;
}
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