/// <summary>
/// <param name="locations">A 2D map of locations on the surface of earth. </param>
/// </summary>
public void FillElevationData(ref LatLonAlt[,] locations)
{
CultureInfo ci = new CultureInfo("en-US");
List<string> loc = new List<string>();
for (int J = 0; J < locations.GetLength(0); J++)
{
for (int I = 0; I < locations.GetLength(1); I++)
{
loc.Add(String.Format(ci, "{0:0.0000},{1:0.0000}", locations[I, J].Latitude, locations[I, J].Longitude));
}
}
var url = String.Format("http://maps.googleapis.com/maps/api/elevation/xml?sensor=false&locations={0}", loc.Aggregate((i, j) => i + "|" + j));
Console.WriteLine("Fetching elevation data from maps.googleapis.com...");
XmlDocument elevationData = new XmlDocument();
elevationData.Load(url);
XmlNodeList xmlNodeList = elevationData.SelectNodes("/ElevationResponse/result/elevation");
var di = 0; // A local counter
int x = 0; // the I-index of the matrix
int y = 0; // the J-index of the matrix.
foreach (XmlNode xmlNode in xmlNodeList)
{
// Update locations directly as we're spinning through all XML nodes.
locations[x, y].Altitude = double.Parse(xmlNode.InnerText, ci.NumberFormat);
di++;
x = di % locations.GetLength(0);
if (x == 0) y++;
}
}
public static Vertex[,] ToVertex(ref LatLonAlt[,] pos)
{
var vertex = new Vertex[pos.GetLength(0), pos.GetLength(1)];
for (var j = 0; j < pos.GetLength(1); j++)
{
for (var i = 0; i < pos.GetLength(1); i++)
{
vertex[i, j] = ToVertex(pos[i, j]);
}
}
return vertex;
}
public void GenerateSurface(ref LatLonAlt [,] locations)
{
var west = Geometry.CalculateDerivedPosition(Center, DistanceNS / 2.0, 180.0);
var southWest = Geometry.CalculateDerivedPosition(west, DistanceEW / 2.0, 240.0);
var ni = locations.GetLength(0);
var nj = locations.GetLength(1);
double dNS = DistanceNS / (double)ni;
double dEW = DistanceEW / (double)nj;
// Fill in the geographics from southWest up to northEast.
var position = southWest;
for (int J = 0; J < nj; ++J)
{
position = Geometry.CalculateDerivedPosition(position, dEW * (double)J, 90.0);
locations[0, J] = position;
for (int I = 1; I < ni; I++)
{
locations[I, J] = Geometry.CalculateDerivedPosition(position, dNS * (double)I, 0.0);
}
}
}
