public DataAnalyzer(List<Segment> segments, wptType startPoint = null)
{
TrackPoints = BuildTrackPoints(segments, startPoint);
Segments = segments;
Segues = BuildSegues(Segments);
}
public static double Course(wptType pt1, wptType pt2)
{
// convert latitude and longitude to radians
double lat1 = DegreesToRadians((double)pt1.lat);
double lon1 = DegreesToRadians((double)pt1.lon);
double lat2 = DegreesToRadians((double)pt2.lat);
double lon2 = DegreesToRadians((double)pt2.lon);
// compute latitude and longitude differences
double dlat = lat2 - lat1;
double dlon = lon2 - lon1;
double distanceNorth = dlat;
double distanceEast = dlon * Math.Cos(lat1);
// compute the course
double course = Math.Atan2(distanceEast, distanceNorth) % (2 * Math.PI);
course = RadiansToDegrees(course);
if (course < 0)
course += 360;
return course;
}
public List<wptType> BuildTrackPoints(List<Segment> segments, wptType startPoint = null)
{
List<wptType> points = new List<wptType>();
wptType start = startPoint ?? new wptType();
start.name = "Point 1";
points.Add(start);
decimal lat = start.lat;
decimal lon = start.lon;
decimal ele = start.ele;
DateTime time = start.time;
foreach(Segment s in segments)
{
lat += ToDecimal(s.FlatEarthDistance * Math.Cos(s.Course));
lon += ToDecimal(s.FlatEarthDistance * Math.Sin(s.Course));
ele += ToDecimal(ele + ToDecimal(s.VerticalDistance));
time += new TimeSpan(0, 0, 0, ToInt(Math.Floor(s.Time)), ToInt(1000 * (s.Time - ToInt(Math.Floor(s.Time)))));
points.Add(new wptType { name = String.Format("Point {0}", points.Count() + 1), lat = lat, lon = lon, ele = ele, time = time });
}
return points;
}
public static double VerticalVelocity(wptType point1, wptType point2)
{
double distance = VerticalDistance(point1, point2);
TimeSpan time = point2.time - point1.time;
double seconds = time.TotalMilliseconds / 1000;
return distance / seconds;
}
public static double VerticalDistance(wptType point1, wptType point2)
{
return (double)(point2.ele - point1.ele);
}
public static double Velocity(wptType point1, wptType point2, bool flatEarth = false)
{
double distance = Distance(point1, point2, flatEarth);
TimeSpan time = point2.time - point1.time;
double seconds = time.TotalMilliseconds / 1000;
return distance / seconds;
}
public static double Time(wptType point1, wptType point2)
{
TimeSpan time = point2.time - point1.time;
double seconds = time.TotalMilliseconds / 1000;
return seconds;
}
public static double Distance(wptType pt1, wptType pt2, bool flatEarth = false)
{
// convert latitude and longitude to radians
double lat1 = DegreesToRadians((double)pt1.lat);
double lon1 = DegreesToRadians((double)pt1.lon);
double lat2 = DegreesToRadians((double)pt2.lat);
double lon2 = DegreesToRadians((double)pt2.lon);
// compute latitude and longitude differences
double dlat = lat2 - lat1;
double dlon = lon2 - lon1;
double distanceNorth = dlat;
double distanceEast = dlon * Math.Cos(lat1);
// and convert the radians to meters
distanceNorth = RadiansToMeters(distanceNorth);
distanceEast = RadiansToMeters(distanceEast);
double distance = Distance(distanceNorth, distanceEast);
if (!flatEarth)
{
// add the elevation difference to the calculation
double vertical = (double)pt2.ele - (double)pt1.ele;
distance = Distance(distanceNorth, distanceEast, vertical);
}
return distance;
}
