Image¶

class Image(data=None, wcs=None, polarisation_frame=None)[source]¶

Bases: object

Image class with Image data (as a numpy.array) and the AstroPy implementation of a World Coodinate System

Many operations can be done conveniently using numpy processing_library on Image.data_models.

Most of the imaging processing_library require an image in canonical format: - 4 axes: RA, DEC, POL, FREQ

The conventions for indexing in WCS and numpy are opposite. - In astropy.wcs, the order is (longitude, latitude, polarisation, frequency) - in numpy, the order is (frequency, polarisation, latitude, longitude)

Warning

The polarisation_frame is kept in two places, the WCS and the polarisation_frame variable. The latter should be considered definitive.

Attributes Summary

`frequency`
`nchan`
`nheight`
`npol`
`nwidth`
`phasecentre`
`shape`

Methods Summary

size()

Return size in GB

Attributes Documentation

frequency¶

nchan¶

nheight¶

npol¶

nwidth¶

phasecentre¶

shape¶

Methods Documentation

size()[source]¶: Return size in GB