Commit 616a6351 authored by Simon Conseil's avatar Simon Conseil

Update documentation for FSFModel

parent 29a4776e
Pipeline #3045 passed with stage
in 14 minutes and 49 seconds
......@@ -40,6 +40,7 @@ extensions = [
......@@ -87,15 +87,21 @@ MUSE FSF models
.. warning:: FSF class is currently under development
Only one model of FSF (Field Spread Function) is currently available.
Two models of FSF (Field Spread Function) are currently available:
- `~mpdaf.MUSE.OldMoffatModel` (``model='MOFFAT1'``): the old model with a fixed
- `~mpdaf.MUSE.MoffatModel2` (``model=2``): a circular MOFFAT with polynomials
for beta and FWHM.
Example with *MOFFAT1*
The MUSE FSF is supposed to be a Moffat function with a FWHM which varies
linearly with the wavelength:
fwhm = a + b*lbda
:math:`FWHM = a + b * lbda`
......@@ -103,37 +109,44 @@ With:
- a (float) constant in arcsec which defined the FWHM.
- b (float) constant which defined the FWHM.
We create the `~mpdaf.MUSE.FSF` object like this:
We create the `~mpdaf.MUSE.FSFModel` object like this:
.. ipython::
In [1]: from mpdaf.MUSE import FSF
In [1]: from mpdaf.MUSE import FSFModel, OldMoffatModel
In [2]: fsf = OldMoffatModel(a=0.885, b=-2.94E-05, beta=2.8, pixstep=0.2)
In [2]: fsf = FSF(typ='MOFFAT1')
In [3]: isinstance(fsf, FSFModel)
`~mpdaf.MUSE.FSF.get_FSF` returns for each wavelength an array and the FWHM in
pixel and in arcseconds.
Various methods allow to get the FSF array (2D or 3D, as mpdaf Image or Cube)
for given wavelengths, or the FWHM in pixel and in arcseconds.
.. ipython::
In [3]: fsf_array, fwhm_pix, fwhm_arcsec = fsf.get_FSF(lbda=[5000, 9000], step=0.2, size=21, beta=2.8, a=0.885, b=-2.94E-05)
In [1]: lbda = np.array([5000, 9000])
In [4]: print(fwhm_pix)
In [4]: fsf.get_fwhm(lbda)
In [5]: print(fwhm_arcsec)
In [5]: fsf.get_fwhm(lbda, unit='pix')
In [20]: im5000 = fsf.get_2darray(lbda[0], shape=(25, 25))
In [20]: fsfcube = fsf.get_3darray(lbda, shape=(25, 25))
In [27]: plt.figure()
@savefig FSF1.png width=3.5in
In [26]: plt.imshow(fsf_array[1], vmin=0, vmax=60, interpolation='nearest')
In [26]: plt.imshow(im5000)
In [27]: plt.figure()
@savefig FSF2.png width=3.5in
In [28]: plt.imshow(fsf_array[0], vmin=0, vmax=60, interpolation='nearest')
In [28]: plt.imshow(fsfcube[1])
The FSF model can be saved to a FITS header with
`mpdaf.MUSE.FSFModel.to_header`, and read with ``.
It is also possible to use `~mpdaf.MUSE.FSF.get_FSF_cube` that returns a cube of
FSFs with the same coordinates that the MUSE data cube given as input.
MUSE mosaic field map
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