In TypeScript, what is the process for parsing a KML file to obtain points, polylines, and polygons simultaneously?

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To parse a KML file in TypeScript and obtain points, polylines, and polygons simultaneously, you can use a library such as geolib or ogr2ogr.

1. Install the geolib library using npm:

npm install geolib

1. Import the library and use the parseKML function to parse the KML file:

import {parseKML} from 'geolib';

const kmlString = fs.readFileSync('file.kml', {encoding: 'utf-8'});
const kmlData = parseKML(kmlString);

1. The kmlData object contains an array of features, each of which has a geometry property. Filter the features by geometry type to separate points, polylines, and polygons:

const points = kmlData.features.filter(feature => feature.geometry.type === 'Point');
const polylines = kmlData.features.filter(feature => feature.geometry.type === 'LineString');
const polygons = kmlData.features.filter(feature => feature.geometry.type === 'Polygon');

1. You can now use the coordinates property of each geometry to access the individual points, lines, and polygons:

const pointCoordinates = points[0].geometry.coordinates;
const polylineCoordinates = polylines[0].geometry.coordinates;
const polygonCoordinates = polygons[0].geometry.coordinates;

Note that the structure of the coordinates property may vary depending on the complexity of the geometry. For example, a polygon with holes may have multiple arrays of coordinates.