public static Complex[,,] DeGrid(GriddingConstants c, List <List <Subgrid> > metadata, Complex[,] grid, double[,,] uvw, double[] frequencies)
{
FFT.Shift(grid);
var ftGridded = Adder.Split(c, metadata, grid);
var gridded = SubgridFFT.Backward(c, ftGridded);
var visibilities = Gridder.Backwards(c, metadata, gridded, uvw, frequencies, c.SubgridSpheroidal);
return(visibilities);
}
public static Complex[,] Grid(GriddingConstants c, List <List <Subgrid> > metadata, Complex[,,] visibilities, double[,,] uvw, double[] frequencies)
{
var gridded = Gridder.Forward(c, metadata, uvw, visibilities, frequencies, c.SubgridSpheroidal);
var ftgridded = SubgridFFT.Forward(c, gridded);
var grid = Adder.Add(c, metadata, ftgridded);
FFT.Shift(grid);
return(grid);
}
public static double[,] ToImage(GriddingConstants c, List <List <Subgrid> > metadata, Complex[,,] visibilities, double[,,] uvw, double[] frequencies)
{
var gridded = Gridder.Forward(c, metadata, uvw, visibilities, frequencies, c.SubgridSpheroidal);
var ftgridded = SubgridFFT.Forward(c, gridded);
var grid = Adder.Add(c, metadata, ftgridded);
FFT.Shift(grid);
var img = FFT.Backward(grid, c.VisibilitiesCount);
FFT.Shift(img);
//remove spheroidal from grid
/*for (int y = 0; y < img.GetLength(0); y++)
* for (int x = 0; x < img.GetLength(1); x++)
* img[y, x] = img[y, x] / c.GridSpheroidal[y, x];*/
return(img);
}
public static double[,] CalculatePSF(GriddingConstants c, List <List <Subgrid> > metadata, double[,,] uvw, bool[,,] flags, double[] frequencies)
{
var visibilities = new Complex[uvw.GetLength(0), uvw.GetLength(1), frequencies.Length];
for (int i = 0; i < visibilities.GetLength(0); i++)
{
for (int j = 0; j < visibilities.GetLength(1); j++)
{
for (int k = 0; k < visibilities.GetLength(2); k++)
{
if (!flags[i, j, k])
{
visibilities[i, j, k] = new Complex(1.0, 0);
}
else
{
visibilities[i, j, k] = new Complex(0, 0);
}
}
}
}
var gridded = Gridder.Forward(c, metadata, uvw, visibilities, frequencies, c.SubgridSpheroidal);
var ftgridded = SubgridFFT.Forward(c, gridded);
var grid = Adder.Add(c, metadata, ftgridded);
FFT.Shift(grid);
var psf = FFT.Backward(grid, c.VisibilitiesCount);
FFT.Shift(psf);
//remove spheroidal from grid
/*for (int y = 0; y < psf.GetLength(0); y++)
* for (int x = 0; x < psf.GetLength(1); x++)
* psf[y, x] = psf[y, x] / c.GridSpheroidal[y, x];*/
return(psf);
}