/// <summary>
/// Retrieve the required Elevation Files for the set of co-ordinates and add any new files to the cache
/// </summary>
/// <param name="elevationFiles"></param>
private ElevationFile[] GetOrCreateRequiredFilesInCache(DecimalGeoCoordinate[] coordinates)
{
var filenames = ParseFilenamesFromCoordinates(coordinates);
var requiredFiles = new List <ElevationFile>();
foreach (var filename in filenames)
{
ElevationFile newFile = null;
if (!_cache.TryGetValue(filename, out newFile))
{
var filePath = Path.Combine(_elevationDataPath, filename);
if (!System.IO.File.Exists(filePath))
{
throw new FileNotFoundException($"Dataset '{filename}' is not available.");
}
newFile = _elevationFileReader.LoadFile(filePath);
_cache.Set(filename, newFile);
}
requiredFiles.Add(newFile);
}
return(requiredFiles.ToArray());
}
/// <summary>
/// Retrieve the required Elevation Files for the set of co-ordinates and add any new files to the cache
/// </summary>
/// <param name="coordinates"></param>
private ElevationFile[] GetOrCreateRequiredFilesInCache(DecimalGeoCoordinate[] coordinates)
{
var filenames = ParseFilenamesFromCoordinates(coordinates);
var requiredFiles = new List <ElevationFile>();
foreach (var filename in filenames)
{
ElevationFile newFile = null;
if (!_cache.TryGetValue(filename, out newFile))
{
var filePath = Path.Combine(_elevationDataPath, filename);
if (!System.IO.File.Exists(filePath))
{
throw new FileNotFoundException($"Dataset '{filename}' is not available.");
}
newFile = _elevationFileReader.LoadFile(filePath);
// TODO : Add to config / update to a sensible option.
var cacheOptions = new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromMinutes(1));
_cache.Set(filename, newFile, cacheOptions);
}
requiredFiles.Add(newFile);
}
return(requiredFiles.ToArray());
}
/// <summary>
/// Retrieve the elevation for the specified coordinate
/// </summary>
/// <param name="dataSetLocation"></param>
/// <returns></returns>
public int GetElevationAtCoordinate(DecimalGeoCoordinate coordinate)
{
if (coordinate == null)
{
throw new NullReferenceException("location is null");
}
var index = ElevationFile.GetIndexAtCoordinate(coordinate);
return(_data[index]);
}
public ElevationTile(ElevationFile fileReference, short[] data)
{
ElevationFile = fileReference ?? throw new ArgumentNullException("fileReference");
_data = data ?? throw new ArgumentNullException("rawData");
}
