public float[][] ReadRegionAcrossFiles(int xOffset, int yOffset, int xSize, int ySize)
{
int nPixPerTile = xSize * ySize;
float[][] tileData = new float[m_FileDates.Count][];
int fileNum = 0;
foreach (var t in m_FileDates)
{
var newshape = GDAL_Operations.GetRasterShape(t.Value);
if (newshape.Item1 != Shape.Item1 || newshape.Item2 != Shape.Item2)
{
throw new ArgumentException("Raster shapes don't match");
}
var newGT = GDAL_Operations.GetGeoTransform(t.Value);
if (!GeoTransform.SequenceEqual(newGT))
{
throw new ArgumentException("Raster geotransforms don't match");
}
var newNDV = GDAL_Operations.GetNoDataValue(t.Value);
if (newNDV != NoDataValue)
{
throw new ArgumentException("Raster nodata values don't match");
}
var newProj = GDAL_Operations.GetProjection(t.Value);
if (newProj != Projection)
{
throw new ArgumentException("Raster projections don't match");
}
tileData[fileNum] = GDAL_Operations.ReadGDALRasterBandsToFlatArray(
t.Value, xSize, ySize, xOffset, yOffset, 1);
fileNum += 1;
}
return(tileData);
}
/// <summary>
/// Parse key information about the first raster: the geotransform, shape (n pixels X and Y), and
/// nodata value (of the first band). Also calculate the latitude of each row and the longitude of
/// each column.
/// </summary>
private void PopulateRasterProperties()
{
string firstFilename = m_FileDates.First().Value;
GeoTransform = GDAL_Operations.GetGeoTransform(firstFilename);
Shape = GDAL_Operations.GetRasterShape(firstFilename);
NoDataValue = GDAL_Operations.GetNoDataValue(firstFilename);
Projection = GDAL_Operations.GetProjection(firstFilename);
double[] latcoords = new double[Shape.Item1];
double[] loncoords = new double[Shape.Item2];
double originX = GeoTransform[0];
double cellsizeX = GeoTransform[1];
double originY = GeoTransform[3];
double cellsizeY = GeoTransform[5];
for (int i = 0; i < Shape.Item1; i++)
{
latcoords[i] = originY + i * cellsizeY;
}
for (int i = 0; i < Shape.Item2; i++)
{
loncoords[i] = originX + i * cellsizeX;
}
GlobalLatCoords = latcoords;
GlobalLonCoords = loncoords;
}
public float[][] ReadRegionAcrossFiles_MP(int xOffset, int yOffset, int xSize, int ySize)
{
int nPixPerTile = xSize * ySize;
float[][] tileData = new float[m_FileDates.Count][];
ParallelOptions b = new ParallelOptions();
b.MaxDegreeOfParallelism = 6;
var keys = m_FileDates.Keys;
Parallel.For(0, keys.Count, b, c =>
{
var fDate = keys[c];
var fName = m_FileDates[fDate];
var newshape = GDAL_Operations.GetRasterShape(fName);
if (newshape.Item1 != Shape.Item1 || newshape.Item2 != Shape.Item2)
{
throw new ArgumentException("Raster shapes don't match");
}
var newGT = GDAL_Operations.GetGeoTransform(fName);
if (!GeoTransform.SequenceEqual(newGT))
{
throw new ArgumentException("Raster geotransforms don't match");
}
var newNDV = GDAL_Operations.GetNoDataValue(fName);
if (newNDV != NoDataValue)
{
throw new ArgumentException("Raster nodata values don't match");
}
var newProj = GDAL_Operations.GetProjection(fName);
if (newProj != Projection)
{
throw new ArgumentException("Raster projections don't match");
}
tileData[c] = GDAL_Operations.ReadGDALRasterBandsToFlatArray(
fName, xSize, ySize, xOffset, yOffset, 1);
});
return(tileData);
}
