sourcefinder.accessors.lofarhdf5image#
Classes#
Base class for accessors used with |
Module Contents#
- class sourcefinder.accessors.lofarhdf5image.LofarHdf5Image(source, plane=False, beam=False)[source]#
Bases:
sourcefinder.accessors.dataaccessor.DataAccessorBase class for accessors used with
sourcefinder.image.ImageData.Data accessors provide a uniform way for the ImageData class (i.e., generic image representation) to access the various ways in which images may be stored (FITS files, arrays in memory, potentially HDF5, etc.).
This class cannot be instantiated directly, but should be subclassed and the abstract properties provided. Note that all abstract properties are required to provide a valid accessor.
Additional properties may also be provided by subclasses. However, TraP components are required to degrade gracefully in the absence of these optional properties.
- Attributes:
- beamtuple
Restoring beam. Tuple of three floats: semi-major axis (in pixels), semi-minor axis (pixels), and position angle (radians).
- centre_rafloat
Right ascension at the central pixel of the image. Units of J2000 decimal degrees.
- centre_declfloat
Declination at the central pixel of the image. Units of J2000 decimal degrees.
- datanumpy.ndarray
Two-dimensional numpy.ndarray of floating point pixel values.
- freq_bwfloat
The frequency bandwidth of this image in Hz.
- freq_efffloat
Effective frequency of the image in Hz. That is, the mean frequency of all the visibility data which comprises this image.
- pixelsizetuple
(x, y) tuple representing the size of a pixel along each axis in units of degrees.
- tau_timefloat
Total time on sky in seconds.
- taustart_tsfloat
Timestamp of the first integration which constitutes part of this image. MJD in seconds.
- urlstr
A URL representing the location of the image at the time of processing.
- wcs
sourcefinder.utility.coordinates.WCS An instance of
sourcefinder.utility.coordinates.WCS, describing the mapping from data pixels to sky-coordinates.
Notes
The class also provides some common functionality: static methods used for parsing data files, and an ‘extract_metadata’ function which provides key info in a simple dict format.