Sphesihle Makhathini SpheMakh

## Estimate UVW from image parameters
# the phase center PSF
self.phasePSF = phasePSF;
# Observed frequency
self.freq0 = freq0 or 1.;
# the compression in time
self.dtime = dtime or 1;
# the compression in frequency
self.dfreq = dfreq or 1;
# the resolution or the pixel size in radian
self.resolution = np.pi*(cellsize/3600.)/180.;
	# the phase center PSF
	self.phasePSF = phasePSF;
	# Observed frequency
	self.freq0 = freq0 or 1.;
	# the compression in time
	self.dtime = dtime or 1;
	# the compression in frequency
	self.dfreq = dfreq or 1;
	# the resolution or the pixel size in radian
	self.resolution = np.pi*(cellsize/3600.)/180.;