how to use direction angle and speed to calculate next time's latitude and longitude

Question

I have know my current position({lat:x,lon:y}) and I know my speed and direction angle; How to predict next position at next time?

Answer 1

This code works for me :
1. We have to count the distance ( speed * time ).
2. The code converts the distance to KM because earthradius is used in KM too.

            const double radiusEarthKilometres = 6371.01f;

            kmDistance = kmSpeed * (timer1.Interval / 1000f) / 3600f;

            var distRatio = kmDistance / radiusEarthKilometres;
            var distRatioSine = Math.Sin(distRatio);
            var distRatioCosine = Math.Cos(distRatio);

            var startLatRad = deg2rad(lat0);
            var startLonRad = deg2rad(lon0);

            var startLatCos = Math.Cos(startLatRad);
            var startLatSin = Math.Sin(startLatRad);

            var endLatRads = Math.Asin((startLatSin * distRatioCosine) + (startLatCos * distRatioSine * Math.Cos(angleRadHeading)));

            var endLonRads = startLonRad
                + Math.Atan2(Math.Sin(angleRadHeading) * distRatioSine * startLatCos,
                    distRatioCosine - startLatSin * Math.Sin(endLatRads));

            newLat = rad2deg(endLatRads);
            newLong = rad2deg(endLonRads);