public short[] LoadElevationMap(TileInfo tileInfo)
{
MemoryStream memoryStream;
if (tileInfo.FileName.EndsWith(".zip", StringComparison.OrdinalIgnoreCase))
{
memoryStream = GeoTiffHelper.GetZippedTiffStream(GetFileStream(tileInfo.FileName));
}
else
{
memoryStream = GetFileStream(tileInfo.FileName);
}
using var tiff = GeoTiffHelper.TiffFromStream(memoryStream);
return(GeoTiffHelper.GetElevationMap(tiff));
}
private void CreateSubtiles(TileInfo tileInfo, DirectoryInfo targetDirectory, int height, int width, SubTileInfo[] subtilesInfo)
{
using var tiff = GeoTiffHelper.TiffFromFile(_sourceRepository.GetFile(tileInfo));
short[] elevationMap = GeoTiffHelper.GetElevationMap(tiff);
subtilesInfo.AsParallel()
.WithDegreeOfParallelism(4)
.ForAll(CreateSubtileZip);
void CreateSubtileZip(SubTileInfo subTileInfo)
{
var subTileData = GetSubTileData(tileInfo, subTileInfo, width, height, elevationMap);
if (subTileData.Any(v => v != 0))
{
var(north, west, subTileName) = (subTileInfo.North, subTileInfo.West, subTileInfo.SubtileName);
using var subTileTiffStream = GeoTiffHelper.CreateGeoTiff(tiff, subTileName, north, west, width, height, subTileData);
SaveTile(targetDirectory, subTileName, subTileTiffStream);
}
}
}