turf-flip
Takes a point, linestring, polygon, or featurecollection, and flips all of its coordinates from [x, y] to [y, x].
<!doctype html>
<html lang="en">
<head>
<link rel="stylesheet" href="https://rawcdn.githack.com/openlayers/openlayers.github.io/master/en/v5.3.0/css/ol.css" type="text/css">
<link rel="stylesheet" href="assets/css/styles.css" type="text/css">
<script src="//cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script>
<script src="https://rawcdn.githack.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js" type="text/javascript"></script>
<title>Turf and OpenLayers 3 - flip Feature or FeatureCollection</title>
</head>
<body>
<div id="map" class="map"></div>
<script type="text/javascript">
// Tower of Bretagne without properties declared
var pt1 = turf.point([-1.5579479, 47.2175545]);
// Declare a formatter to read GeoJSON
var format = new ol.format.GeoJSON();
// Declare a source
var vectorSource = new ol.source.Vector();
var flipped = turf.flip(pt1);
// When reading features, reproject to EPSG 3857
var features = format.readFeatures(pt1, {
featureProjection: 'EPSG:3857'
});
var flipped_features = format.readFeatures(flipped, {
featureProjection: 'EPSG:3857'
});
var all_features = features.concat(flipped_features);
// Add features
vectorSource.addFeatures(all_features);
// Declare a vector layer with the already
// created source containing added features
var vectorLayer = new ol.layer.Vector({
source: vectorSource
});
// Instanciate a map and add layers
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
vectorLayer
],
view: new ol.View({
center: ol.proj.fromLonLat([47.214751, -1.563046]),
zoom: 2
})
});
</script>
</body>
</html>