//public const double ε = 1;
public static Point GetPoint(this EarthPoint ep)
{
return(new Point()
{
X = c * ep.LongitudeRad,
Y = c * Math.Log(0.5 * ep.LatitudeRad + Math.PI / 4)
});
}
static void Main(string[] args)
{
var p1 = new EarthPoint(77.1539, -139.398);
var p2 = new EarthPoint(-77.1804, -139.55);
var r = p1.DistanceTo(p2);
String GpxPath = args[0];
String TxtPath = args[1];
var gpx = XDocument.Load(GpxPath).Root;
var EarthPoints =
gpx.Element("trk").Element("trkseg")
.Elements("trkpt")
.Select(XPoint =>
new EarthPoint((Double)XPoint.Attribute("lat"), (Double)XPoint.Attribute("lon")))
.ToList();
using (TextWriter tw = new StreamWriter(TxtPath))
{
EarthPoint prewPoint = null;
double x = 0;
foreach (var p in EarthPoints)
{
if (prewPoint != null)
x += p.DistanceTo(prewPoint);
prewPoint = p;
var s = string.Format(System.Globalization.CultureInfo.InvariantCulture.NumberFormat,
"{{ {0:F6}, {1:F6}, {2:F0} }},", p.Latitude, p.Longitude, x);
tw.WriteLine(s);
Console.WriteLine(s);
}
}
Console.ReadLine();
}
private static IEnumerable<PositionedGObject> PositeObjects(GSection sec, GPost post)
{
GPost p2 = sec.Posts
.Where(pp => (int)post.Direction * (post.Ordinate - pp.Ordinate) > 0)
.OrderBy(pp => (int)post.Direction * (post.Ordinate - pp.Ordinate)).FirstOrDefault();
if (p2 == null) yield break;
double l = post.Point.DistanceTo(p2.Point);
foreach (var o in post.Tracks.First().Objects)
{
double ratio = (o.Ordinate - post.Ordinate) / l;
var o_point =
new EarthPoint(
(1 - ratio) * post.Point.Latitude + ratio * p2.Point.Latitude,
(1 - ratio) * post.Point.Longitude + ratio * p2.Point.Longitude);
yield return new PositionedGObject() { Object = o, Point = o_point };
}
}
public static Double EstimateDistances(this EarthPoint p1, EarthPoint p2)
{
return Math.Pow(Math.Sin((p2.LatitudeRad - p1.LatitudeRad) / 2), 2)
+ Math.Cos(p1.LatitudeRad) * Math.Cos(p2.LatitudeRad) * Math.Pow(Math.Sin((p2.LongitudeRad - p1.LongitudeRad) / 2), 2);
}
/// <summary>
/// Возвращает расстояние между точками по теореме гаверсинусов
/// </summary>
/// <param name="p1">Первая точка</param>
/// <param name="p2">Вторая точка</param>
/// <returns>Расстояние между точками в метрах</returns>
public static Double DistanceTo(this EarthPoint p1, EarthPoint p2)
{
return 2 * c * Math.Asin(Math.Sqrt(EstimateDistances(p1, p2)));
}
public static Double EstimateDistances(this EarthPoint p1, EarthPoint p2)
{
return(Math.Pow(Math.Sin((p2.LatitudeRad - p1.LatitudeRad) / 2), 2)
+ Math.Cos(p1.LatitudeRad) * Math.Cos(p2.LatitudeRad) * Math.Pow(Math.Sin((p2.LongitudeRad - p1.LongitudeRad) / 2), 2));
}
/// <summary>
/// Возвращает расстояние между точками по теореме гаверсинусов
/// </summary>
/// <param name="p1">Первая точка</param>
/// <param name="p2">Вторая точка</param>
/// <returns>Расстояние между точками в метрах</returns>
public static Double DistanceTo(this EarthPoint p1, EarthPoint p2)
{
return(2 * c * Math.Asin(Math.Sqrt(EstimateDistances(p1, p2))));
}