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62 lines
2.3 KiB
62 lines
2.3 KiB
// import Turf from "turf";
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let turf = require("turf");
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module.exports = {
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gpsToMeters: function (lat1, lon1, lat2, lon2){ // generally used geo measurement function
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var R = 6378.137; // Radius of earth in KM
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var dLat = lat2 * Math.PI / 180 - lat1 * Math.PI / 180;
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var dLon = lon2 * Math.PI / 180 - lon1 * Math.PI / 180;
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var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
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Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
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Math.sin(dLon/2) * Math.sin(dLon/2);
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var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
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var d = R * c;
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return d * 1000; // meters
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},
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calculateArea: function (points) {
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var polygon = turf.polygon([points.map((point) => {
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return [point.lng, point.lat];
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})]);
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var area = turf.area(polygon);
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console.log(area);
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return area;
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// var poly1 = turf.polygon([[
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// [-82.574787, 35.594087],
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// [-82.574787, 35.615581],
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// [-82.545261, 35.615581],
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// [-82.545261, 35.594087],
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// [-82.574787, 35.594087]
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// ]], {"fill": "#0f0"});
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// var poly2 = turf.polygon([[
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// [-82.560024, 35.585153],
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// [-82.560024, 35.602602],
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// [-82.52964, 35.602602],
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// [-82.52964, 35.585153],
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// [-82.560024, 35.585153]
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// ]], {"fill": "#00f"});
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// var union = turf.union(poly1, poly2);
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// console.log(union.geometry.coordinates);
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// var poly1 = turf.polygon([[
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// [-122.801742, 45.48565],
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// [-122.801742, 45.60491],
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// [-122.584762, 45.60491],
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// [-122.584762, 45.48565],
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// [-122.801742, 45.48565]
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// ]]);
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// var poly2 = turf.polygon([[
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// [-122.520217, 45.535693],
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// [-122.64038, 45.553967],
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// [-122.720031, 45.526554],
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// [-122.669906, 45.507309],
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// [-122.723464, 45.446643],
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// [-122.532577, 45.408574],
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// [-122.487258, 45.477466],
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// [-122.520217, 45.535693]
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// ]]);
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// var intersection = turf.intersect(poly1, poly2);
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// console.log(intersection);//null if no intersect
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}
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} |