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.. _validation:
Validation and Bounds checking
******************************
.. _wcslint:
Validating the WCS keywords in a FITS file
------------------------------------------
``astropy`` includes a command-line tool, ``wcslint``, to check the WCS
keywords in a FITS file. The example below shows it reporting back
results for a problematic file named ``invalid.fits``::
> wcslint invalid.fits
HDU 1:
WCS key ' ':
- RADECSYS= 'ICRS ' / Astrometric system
RADECSYS is non-standard, use RADESYSa.
- The WCS transformation has more axes (2) than the image it is
associated with (0)
- 'celfix' made the change 'PV1_5 : Unrecognized coordinate
transformation parameter'.
HDU 2:
WCS key ' ':
- The WCS transformation has more axes (3) than the image it is
associated with (0)
- 'celfix' made the change 'In CUNIT2 : Mismatched units type
'length': have 'Hz', want 'm''.
- 'unitfix' made the change 'Changed units: 'HZ ' -> 'Hz''.
.. _wcs-bounds-check:
Bounds checking
---------------
Bounds checking is enabled by default, and any computed world
coordinates outside of [-180°, 180°] for longitude and [-90°, 90°] in
latitude are marked as invalid. To disable this behavior, use
`astropy.wcs.Wcsprm.bounds_check`.
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