s2-tools/dist/geometry/s2/convert.js

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

import { fromST, toLonLat } from './point';
/**
 * Convert an S2Feature to a GeoJSON Feature
 * @param data - S2Feature
 * @returns - GeoJSON Feature
 */
export function toWM(data) {
    const { id, face, properties, metadata, geometry } = data;
    convertGeometry(face, geometry);
    return {
        id,
        type: 'VectorFeature',
        properties,
        metadata,
        geometry,
    };
}
/**
 * Underlying conversion mechanic to move S2Geometry to GeoJSON Geometry
 * @param face - Face
 * @param geometry - S2 Geometry
 */
function convertGeometry(face, geometry) {
    const { type, coordinates } = geometry;
    if (type === 'Point')
        convertGeometryPoint(face, coordinates);
    else if (type === 'MultiPoint')
        coordinates.forEach((point) => convertGeometryPoint(face, point));
    else if (type === 'LineString')
        coordinates.forEach((point) => convertGeometryPoint(face, point));
    else if (type === 'MultiLineString')
        coordinates.forEach((line) => line.forEach((point) => convertGeometryPoint(face, point)));
    else if (type === 'Polygon')
        coordinates.forEach((line) => line.forEach((point) => convertGeometryPoint(face, point)));
    else if (type === 'MultiPolygon')
        coordinates.forEach((polygon) => polygon.forEach((line) => line.forEach((point) => convertGeometryPoint(face, point))));
    else {
        throw new Error('Invalid S2Geometry type');
    }
}
/**
 * Mutate an S2 Point to a GeoJSON Point
 * @param face - Face
 * @param point - S2 Point
 */
function convertGeometryPoint(face, point) {
    const { x: s, y: t } = point;
    const [lon, lat] = toLonLat(fromST(face, s, t));
    point.x = lon;
    point.y = lat;
}
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