/// <summary>
/// Constructor
/// </summary>
/// <param name="rTemplate"></param>
/// <param name="newRect"></param>
/// <param name="rOutputRaster"></param>
public PointDensity(Raster rDEM, Vector vPointCloud, Raster OutputRaster, RasterOperators.KernelShapes eKernel, decimal fSize)
: base(new List <Raster>() { rDEM }, OutputRaster)
{
_vinput = vPointCloud;
_routput = OutputRaster;
_kshape = eKernel;
_fsize = (double)fSize;
_fsizedec = fSize;
// set the rows to be a certain multiple of fSize windows
chunkRows = (int)Math.Ceiling((NUMWINDOWS * fSize) / Math.Abs(rDEM.Extent.CellHeight));
// Calling this again after setting the rows will give us a nicer chunk size
SetOpExtent(OpExtent);
VectorChunkExtent = ChunkExtent.Buffer(_fsizedec);
switch (eKernel)
{
case RasterOperators.KernelShapes.Circle:
area = Math.PI * Math.Pow((double)fSize, 2);
break;
case RasterOperators.KernelShapes.Square:
area = Math.Pow((double)fSize * 2, 2);
break;
}
}
/// <summary>
/// Chunk op implementation
/// </summary>
/// <param name="data"></param>
/// <param name="outChunk"></param>
protected override void ChunkOp(List <double[]> data, List <double[]> outBuffers)
{
// Get all the points in this chunk
VectorChunkExtent = ChunkExtent.Buffer(_fsizedec);
List <Geometry>[,] bins = BinPoints(_vinput.GeometriesIntersectExtent(VectorChunkExtent));
for (int cid = 0; cid < outBuffers[0].Length; cid++)
{
// Save us a metric Tonne of effort by giving up on nodatavals in the DEM
if (data[0][cid] == inNodataVals[0])
{
outBuffers[0][cid] = outNodataVals[0];
}
else
{
double outval = 0;
decimal[] cidxy = ChunkExtent.Id2XY(cid);
Geometry pt2 = new Geometry(wkbGeometryType.wkbPoint);
pt2.AddPoint((double)cidxy[0], (double)cidxy[1], 0);
List <int[]> bins2test = GetRelevantBins(pt2);
// create a circle and then buffer it.
foreach (int[] binids in bins2test)
{
if (binids[0] < bins.GetLength(0) && binids[1] < bins.GetLength(1))
{
foreach (Geometry pt in bins[binids[0], binids[1]])
{
// If we're a circle we have to do a more expensive operation now
if (_kshape == RasterOperators.KernelShapes.Circle)
{
if (InsideRadius(pt, pt2))
{
outval++;
}
}
else if (InsideSquare(pt, pt2))
{
outval++;
}
}
}
}
outBuffers[0][cid] = outval / area;
}
}
}