Displaying Cubes

The Cubeviz layout includes three image viewers (at the top of the app) and one spectrum viewer (at the bottom of the app), which it attempts to populate automatically when the first dataset is loaded. By default, cubeviz attempts to parse and display the flux in the top left viewer, the uncertainty in the top middle viewer, and the mask into the top right viewer. The spectrum viewer is populated by default by collapsing the spatial axes using the max function. The indicators that the load machinery looks for in each HDU to populate the viewers are below (note that in all cases, header values are converted to lower case):

  • Flux viewer: hdu.name is in the set ['flux', 'sci']

  • Uncertainty viewer: hdu.header.keys() includes “errtype” or hdu.name is in the set ['ivar', 'err', 'var', 'uncert']

  • Mask viewer: hdu.data.dtype is np.int, np.uint or np.uint32, or hdu.name is in the set ['mask', 'dq']

If any viewer fails to populate automatically, or if displaying different data is desired, the user can manually select data for each viewer as described in the next section. Different statistics for collapsing the spectrum displayed in the spectrum viewer can be chosen as described in Display Settings. Note that any spatial subsets will also be collapsed into a spectrum using the same statistic and displayed in the spectrum viewer along with the spectrum resulting from collapsing all the data in each spectral slice.

Selecting Data Set

More words…

Changing Wavelength Slice

Defining and Selecting Region Subsets

Pan/Zoom

More words…

Defining Spectral Regions

More words…

Display Settings

More words…