How do I find the lat/long that is x km north of a given lat/long?

Question

I have some C# code that generates google maps. This codes looks at all the Points I need to plot on the map and then works out the Bounds of a rectangle to include those po

Answer 1

For people who want a java version Eirch's code

/**
 * move latlng point by rang and bearing
 *
 * @param latLng  point
 * @param range   range in meters
 * @param bearing bearing in degrees
 * @return new LatLng
 */
public static LatLng moveLatLng(LatLng latLng, double range, double bearing) {
    double EarthRadius = 6378137.0;
    double DegreesToRadians = Math.PI / 180.0;
    double RadiansToDegrees = 180.0 / Math.PI;

    final double latA = latLng.latitude * DegreesToRadians;
    final double lonA = latLng.longitude * DegreesToRadians;
    final double angularDistance = range / EarthRadius;
    final double trueCourse = bearing * DegreesToRadians;

    final double lat = Math.asin(
            Math.sin(latA) * Math.cos(angularDistance) +
                    Math.cos(latA) * Math.sin(angularDistance) * Math.cos(trueCourse));

    final double dlon = Math.atan2(
            Math.sin(trueCourse) * Math.sin(angularDistance) * Math.cos(latA),
            Math.cos(angularDistance) - Math.sin(latA) * Math.sin(lat));

    final double lon = ((lonA + dlon + Math.PI) % (Math.PI * 2)) - Math.PI;

    return new LatLng(lat * RadiansToDegrees, lon * RadiansToDegrees);
}