/// <summary>
/// Tries to use the DEM stored in memory.
/// </summary>
/// <returns>NULL if the in-memory DEM is not available.</returns>
private RasterDigitalElevationModelBase TryMemory()
{
RasterDigitalElevationModelBase result = null;
long maxBytes = 1024 * 1024 * 1024 * 2L; // 2 GiB
// 2 GiB is the .NET limit for allocating RAM, at least in 2.0.
// See https://stackoverflow.com/questions/1087982/single-objects-still-limited-to-2-gb-in-size-in-clr-4-0
if (RequiredBytes > maxBytes)
{
this.ActivityLogger.LogFormat(ActivityLogLevel.Warning,
"In-memory cache not available due to DEM size of {0} MiB bigger than 2 GiB.", RequiredMebibytes);
return(null);
}
try
{
result = new MemoryBasedRasterDigitalElevationModel(
lonResolution, latResolution, lonOffset, latOffset, lonLength, latLength);
}
catch (OverflowException)
{
return(null);
}
catch (OutOfMemoryException)
{
this.ActivityLogger.LogFormat(ActivityLogLevel.Warning,
"In-memory cache not available due to not enough free memory. DEM needs {0} MiB.", RequiredMebibytes);
return(null);
}
return(result);
}
public override object Clone()
{
MemoryBasedRasterDigitalElevationModel clone = new MemoryBasedRasterDigitalElevationModel(
LonResolution, LatResolution, LonOffset, LatOffset, LonLength, LatLength);
clone.data = (Int16[])this.data.Clone();
return(clone);
}
