The ObservationManager Class

The calculations underlying the graphical application are separated into the file vriCalc.py to facilitate use with alternative interfaces. For example, observations may be simulated from the basic ipython shell as follows:

	  
    # Load the observation manager
    from Imports.vriCalc import observationManager
    obsMan = observationManager(verbose=True, debug=True)
    obsMan.get_available_arrays()

    # Select array configurations and hour-angle ranges.
    obsMan.select_array('VLA_A')
    obsMan.select_array('VLA_B')
    obsMan.select_array('VLA_C')
    obsMan.select_array('VLA_D')
    obsMan.get_selected_arrays()

    # Set the observing frequency (MHz) and source declination (deg).
    obsMan.set_obs_parms(1420.0, 20.0)

    # Calculate the uv-coverage
    obsMan.calc_uvcoverage()

    # Load the model and set the pixel scale in arcsec
    obsMan.load_model_image("models/galaxy_lobes.png")
    obsMan.set_pixscale(1.0)

    # Calculate the FFT of the model image
    obsMan.invert_model()

    # Grid the uv-coverage onto the same pixels as the FFT as the model image
    obsMan.grid_uvcoverage()

    # Create the beam image
    obsMan.calc_beam()

    # Apply the uv-coverage and create observed image
    obsMan.invert_observation()