/// <summary>
/// Gets a list of coordinates that are related to the returned index of the elevation data.
/// </summary>
/// <returns>A list of coordinates that are related to the index of the returned elevation data.</returns>
public List <Coordinate> GetElevationCoordinates()
{
if (Points != null && Points.Count > 0)
{
if (GetGeoidOffset || samples == 0)
{
return(Points);
}
else
{
//Calculate distance of polyline
double totalDistance = 0;
for (int i = 0; i < Points.Count - 1; i++)
{
totalDistance += SpatialTools.HaversineDistance(Points[i], Points[i + 1], DistanceUnitType.Kilometers);
}
double segementLength = totalDistance / samples;
var coords = new List <Coordinate>(samples);
coords.Add(Points[0]);
int idx = 0;
//Calculate equally spaced coordinates along polyline
for (var s = 0; s < samples; s++)
{
double dist = 0;
double travel = segementLength * s;
double dx = travel;
for (var i = 0; i < Points.Count - 1; i++)
{
dist += SpatialTools.HaversineDistance(Points[i], Points[i + 1], DistanceUnitType.Kilometers);
if (dist >= travel)
{
idx = i;
break;
}
dx = travel - dist;
}
if (dx != 0 && idx < Points.Count - 1)
{
var bearing = SpatialTools.CalculateBearing(Points[idx], Points[idx + 1]);
coords.Add(SpatialTools.CalculateCoord(Points[idx], bearing, dx, DistanceUnitType.Kilometers));
}
}
return(coords);
}
}
else if (Bounds != null)
{
double dLat = Math.Abs(Bounds.NorthLatitude - Bounds.SouthLatitude) / row;
double dLon = Math.Abs(Bounds.WestLongitude - Bounds.EastLongitude) / col;
double x, y;
var coords = new Coordinate[row * col];
//The elevation values are ordered starting with the southwest corner, and then proceed west to east and south to north.
for (int r = 0; r < row; r++)
{
y = Bounds.SouthLatitude + (dLat * r);
for (int c = 0; c < col; c++)
{
x = Bounds.WestLongitude + (dLon * c);
int idx = r * row + c;
coords[idx] = new Coordinate()
{
Latitude = y,
Longitude = x
};
}
}
return(new List <Coordinate>(coords));
}
return(null);
}