" var rLat = (radius/3963.189) * (180/PI)"
Can anyone explain how did we come up with this *rlat formula*
and what value does *radius/earth's radius gives*
On Tuesday, July 5, 2011 at 7:53:44 PM UTC+5:30, Karthik Reddy wrote:
>
> function getCirclePoints(center,radius){
>
> var circlePoints = Array();
>
> var searchPoints = Array();
>
> var bounds = new google.maps.LatLngBounds();
>
> with (Math) {
>
> var rLat = (radius/3963.189) * (180/PI); // miles
>
> var rLng = rLat/cos(center.lat() * (PI/180));
>
> for (var a = 0 ; a < 361 ; a++ ) {
>
> var aRad = a*(PI/180);
>
> var x = center.lng() + (rLng * cos(aRad));
>
> var y = center.lat() + (rLat * sin(aRad));
>
> var point = new google.maps.LatLng(parseFloat(y),parseFloat(x),true);
>
> circlePoints.push(point);
>
> bounds.extend(point);
>
> if (a % pointInterval == 0) {
>
> searchPoints.push(point);
>
> }
>
> }
>
> }
>
> searchPolygon = new google.maps.Polygon({
>
> paths: circlePoints,
>
> strokeColor: '#0000ff',
>
> strokeOpacity: 1,
>
> strokeWeight: 1,
>
> fillColor: '#0000ff',
>
> fillOpacity: 0.2
>
> });
>
> searchPolygon.setMap(map);
>
> map.fitBounds(bounds);
>
>
> //map.setCenter(searchPolygon.getBounds().getCenter(),map.getBoundsZoomLevel(searchPolygon.getBounds()));
>
> return searchPoints;
>
> }
>
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