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Arcade expression for generating a Google Maps directions link at a point
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function MetersToLatLon(x, y) { | |
// Converts XY point from Spherical Mercator EPSG:900913 to lat/lon in WGS84 Datum | |
// Source: http://www.maptiler.org/google-maps-coordinates-tile-bounds-projection/ | |
// Source: https://community.esri.com/thread/222695-latlong-unit-conversion-with-arcade#comment-806053 | |
var originShift = 2.0 * PI * 6378137.0 / 2.0; | |
var lon = (x / originShift) * 180.0; | |
var lat = (y / originShift) * 180.0; | |
lat = 180.0 / PI * (2.0 * Atan( Exp( lat * PI / 180.0)) - PI / 2.0); | |
return [lat, lon]; | |
} | |
function CreateGMapsURL(lat, lon) { | |
// Source: https://developers.google.com/maps/documentation/urls/guide#directions-action | |
return "https://www.google.com/maps/dir/?api=1&destination=" + lat + "," + lon + "&dir_action=navigate" | |
} | |
var latlon = MetersToLatLon(Geometry($feature).X, Geometry($feature).Y); | |
var url = CreateGMapsURL(latlon[0], latlon[1]); | |
return url; |
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