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adding docs for Source Detection with PSF fitting
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PSF Fitting | ||
=========== | ||
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A few PSF fitting utilities are included to interface between observations | ||
within Roman datamodels and methods within dependencies that generate and | ||
fit PSF models to observations. | ||
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Create PSF models | ||
----------------- | ||
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`~romancal.lib.psf.create_gridded_psf_model` computes a gridded PSF model for | ||
a given detector using `~webbpsf.gridded_library.CreatePSFLibrary` from | ||
`WebbPSF <https://webbpsf.readthedocs.io/>`_. The defaults are chosen to | ||
balance more accurate PSF models with the cost of increased runtime. For | ||
further reading on the WebbPSF approach to ePSFs, see the WebbPSF docs on | ||
`Using PSF Grids <https://webbpsf.readthedocs.io/en/latest/psf_grids.html>`_. | ||
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Fit model PSFs to an ImageModel | ||
------------------------------- | ||
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Once PSF models are generated, you can fit those models to observations | ||
in an ImageModel with `~romancal.lib.psf.fit_psf_to_image_model` using | ||
`photutils <https://photutils.readthedocs.io/en/stable/psf.html>`_. | ||
By default the fits are done with `~photutils.psf.PSFPhotometry`, and | ||
crowded fields may benefit from using `~photutils.psf.IterativePSFPhotometry`. | ||
For neighboring sources that are near one another on the detector, grouping | ||
the sources and fitting their PSFs simultaneously improves the fit quality. | ||
Initial guesses for target centroids can be given or source | ||
detection can be performed with, e.g., `~photutils.detection.DAOStarFinder`. |
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