/// <summary>
/// Calculates the north-east (top-left) GCS minLat and maxLat
/// to get the maxLat and maxLon of the current chunk
/// </summary>
public GCS getNorthEastGCS()
{
USlippyTile result = new USlippyTile(x, y, zoom);
result.x += 1;
result.y -= 1;
if (result.x < 0 || result.y < 0)
{
return(null);
}
return(result.getGCS());
}
/// <summary>
/// Uses the OpenStreetMap API to get the desired data in a latitude and longitude bounds.
/// </summary>
/// <param name="tile">tile x, y and zoom</param>
/// <returns>An XML with the OSM data</returns>
public static XmlDocument getOSMXML(USlippyTile tile)
{
XmlDocument xml = new XmlDocument();
using (WebClient client = new WebClient())
{
//tile.y
USlippyTile copy = new USlippyTile(tile.x, tile.y, tile.zoom);
copy.y += 1;
GCS gcs = copy.getGCS();
/// North-East USlippyTile's GCS
GCS gcsNE = copy.getNorthEastGCS();
// # LefttLon #LowLat #RightLon #HiLat
//chunkLimits = [2.13078, 41.48236, 2.13454, 41.48593]
string url = OSMApiCall + gcs.lon + "," + gcs.lat + "," + gcsNE.lon + "," + gcsNE.lat;
xml.LoadXml(client.DownloadString(url));
}
return(xml);
}
