//Converts a latitude and longitude to quadtree at the specified zoom level
public static string LatLonToQuadTree(LatLon latLon, int zoom)
{
GeoPoint m = LatLonToMeters(latLon);
TileAddress t = MetersToTile(m, zoom);
return(t.ToQuadTree());
}
//Returns bounds of the given tile in EPSG:900913 coordinates
public static GeoExtent TileBounds(TileAddress t)
{
var min = PixelsToMeters(new Point(t.X * TileSize, t.Y * TileSize), t.Zoom);
var max = PixelsToMeters(new Point((t.X + 1) * TileSize, (t.Y + 1) * TileSize), t.Zoom);
return(new GeoExtent(min, max));
}
//Returns bounds of the given tile in latitude/longitude using WGS84 datum
public static GeoExtent TileLatLonBounds(TileAddress t)
{
var bound = TileBounds(t);
var min = MetersToLatLon(new GeoPoint(bound.Left, bound.Top));
var max = MetersToLatLon(new GeoPoint(bound.Right, bound.Bottom));
return(new GeoExtent(min, max));
}
//Returns a list of all of the quadtree locations at a given zoom level within a latitude/longitude box
public static List <string> GetQuadTreeList(int zoom, LatLon latLonMin, LatLon latLonMax)
{
if (latLonMax.Latitude < latLonMin.Latitude || latLonMax.Longitude < latLonMin.Longitude)
{
return(null);
}
GeoPoint mMin = LatLonToMeters(latLonMin);
TileAddress tmin = MetersToTile(mMin, zoom);
GeoPoint mMax = LatLonToMeters(latLonMax);
TileAddress tmax = MetersToTile(mMax, zoom);
var arr = new List <string>();
for (var ty = tmin.Y; ty <= tmax.Y; ty++)
{
for (var tx = tmin.X; tx <= tmax.X; tx++)
{
arr.Add(new TileAddress(tx, ty, zoom).ToQuadTree());
}
}
return(arr);
}
//Converts a Quadtree location into a latitude/longitude bounding rectangle
public static GeoExtent QuadTreeToLatLon(string quadtree)
{
TileAddress t = QuadTreeToTile(quadtree, quadtree.Length);
return(TileLatLonBounds(t));
}
// Switch to TMS Tile representation from Google
public static TileAddress ToTmsTile(TileAddress t)
{
return(new TileAddress(t.X, ((int)Math.Pow(2, t.Zoom) - 1) - t.Y, t.Zoom));
}