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| -rwxr-xr-x | astro/fits/fitscube.py | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/astro/fits/fitscube.py b/astro/fits/fitscube.py index 2e1bddf..f69cfd2 100755 --- a/astro/fits/fitscube.py +++ b/astro/fits/fitscube.py @@ -5,7 +5,29 @@ # """ -Create FITS image cube from a series of image slices. +FITS image cube manipulation tool. + +This tool was originally developed to create a FITS image cube from a +series of CT scan slices to help better visualize/examine them in the +sophisticated SAOImage DS9 software. Each slice in the cube is a CT +image at a position from the CT scan, with the z-axis tracking the slice +positions (equal-distant) in units of, e.g., [cm]. + +Then this tool was significantly improved to deal with the spectral cube +in radio astronomy, with each slice representing the radio sky at a +certain frequency (channel), so the z-axis records the frequency in +units of [Hz]. + +For example, we simulate the observed image using OSKAR and WSClean one +frequency channel at a time, then use this tool to combine them into +a spectral cube, from which the 2D and 1D power spectra is derived. + +The ``calibrate`` sub-command is used to calibrate the frequency channel +responses to make them spectrally smooth by fitting a low-order polynomial. + +The ``corrupt`` sub-command is used to corrupt the frequency channel +responses to simulate that real instrument suffers from calibration +imperfections. """ import os |