/// <summary>
/// Generates an index file by listing all available SRTM cells on the FTP site.
/// </summary>
public void Generate()
{
activityLogger.Log(ActivityLogLevel.Verbose, "Downloading data for SRTM index generation");
for (SrtmContinentalRegion continentalRegion = (SrtmContinentalRegion)(SrtmContinentalRegion.None + 1);
continentalRegion < SrtmContinentalRegion.End;
continentalRegion++)
{
string region = continentalRegion.ToString();
string url = srtmSource + region + "/";
WebRequest request = WebRequest.Create(new System.Uri(url));
WebResponse response = request.GetResponse();
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd();
MatchCollection matches = Regex.Matches(responseFromServer, fileNamePattern, RegexOptions.IgnoreCase);
// Process each match.
foreach (Match match in matches)
{
GroupCollection groups = match.Groups;
string filename = groups[1].Value.Trim();
if (filename.Length == 0)
{
continue;
}
Srtm3Cell srtm3Cell = Srtm3Cell.CreateSrtm3Cell(filename, false);
SetValueForCell(srtm3Cell.CellLon, srtm3Cell.CellLat, (int)continentalRegion);
}
// Cleanup the streams and the response.
reader.Close();
dataStream.Close();
response.Close();
}
}
public IDictionary <int, Srtm3Cell> FetchCachedCellsList()
{
Dictionary <int, Srtm3Cell> cachedCells = new Dictionary <int, Srtm3Cell> ();
DirectoryInfo cacheDir = new DirectoryInfo(Srtm3CachePath);
FileInfo[] files = null;
try
{
files = cacheDir.GetFiles("*.hgt");
foreach (FileInfo file in files)
{
Srtm3Cell cell = Srtm3Cell.CreateSrtm3Cell(file.Name, false);
cachedCells.Add(Srtm3Cell.CalculateCellKey(cell), cell);
}
}
catch (DirectoryNotFoundException)
{
// no cache found, skip
}
return(cachedCells);
}