DistortionLookupTable#
- class astropy.wcs.DistortionLookupTable(table, crpix, crval, cdelt)#
Bases:
object
Represents a single lookup table for a distortion paper transformation.
- Parameters:
- table2-dimensional
array
The distortion lookup table.
- crpix2-tuple
The distortion array reference pixel, in FITS Header format: 1-based indexing, (x,y) order.
- crval2-tuple
The image array pixel coordinate, in FITS Header format: 1-based indexing, (x,y) order.
- cdelt2-tuple
The grid step size
- table2-dimensional
Attributes Summary
double array[naxis]
Coordinate increments (CDELTia
) for each coord axis.double array[naxis]
Coordinate reference pixels (CRPIXja
) for each pixel axis.double array[naxis]
Coordinate reference values (CRVALia
) for each coordinate axis.float array
The array data for theDistortionLookupTable
.Methods Summary
get_offset
(x, y)Returns the offset as defined in the distortion lookup table.
Attributes Documentation
- cdelt#
double array[naxis]
Coordinate increments (CDELTia
) for each coord axis.If a
CDi_ja
linear transformation matrix is present, a warning is raised andcdelt
is ignored. TheCDi_ja
matrix may be deleted by:del wcs.wcs.cd
An undefined value is represented by NaN.
- crpix#
double array[naxis]
Coordinate reference pixels (CRPIXja
) for each pixel axis.
- crval#
double array[naxis]
Coordinate reference values (CRVALia
) for each coordinate axis.
- data#
float array
The array data for theDistortionLookupTable
.
Methods Documentation