Specviz Selections
This section explains the working theory behind the selection tool and was inspired by the the introduction of two methods to the Specviz helper:
specviz.get_spectra()
specviz.get_spectral_regions()
Data loaded in are imported into Jdaviz and immediately converted into a
specutils.SpectralRegion
object. These are a spectral analog to the Astropy regions
(which instead focuses on spatial regions and their associated WCS). These spectral regions
are returned by the specviz.get_spectra()
method.
The selection tool allows the user to specify a specific range on the graph.
This is defined by the underlying Glue library upon which Jdaviz relies on as a
“Glue Subset.” Thus throughout the software documentation, we will refer to these
user defined ranges as “subsets.” Effectively, the selection tool defines a mask that
can be thought of as “definition” of which data is and is not included in the subset.
Upon extraction via specviz.get_spectral_regions()
, the method will return a new
specutils.SpectralRegion
object that applies that mask atop of the proper region
(data) displayed, and realizes the subset the user defined in Jdaviz.