FilterDefinition

class lsst.obs.base.FilterDefinition(physical_filter: str, band: Optional[str] = None, doc: Optional[str] = None, afw_name: Optional[str] = None, alias: AbstractSet[str] = frozenset({}))

Bases: object

The definition of an instrument’s filter bandpass.

This class is used to interface between the Filter class and the Gen2 CameraMapper and Gen3 Instruments and physical_filter/band Dimension.

This class is likely temporary, until we have a better versioned filter definition system that includes complete transmission information.

Attributes Summary

afw_name	If not None, the name of the Filter object.
alias	Alternate names for this filter.
band	The generic name of a filter not associated with a particular instrument (e.g.
doc	A short description of this filter, possibly with a link to more information.

Methods Summary

makeFilterLabel()

Create a complete FilterLabel for this filter.

Attributes Documentation

afw_name: Optional[str] = None

If not None, the name of the Filter object.

This is distinct from physical_filter and band to maintain backwards compatibility in some obs packages. For example, for HSC there are two distinct r and i filters, named r/r2 and i/i2.

alias: AbstractSet[str] = frozenset({})

Alternate names for this filter. These are added to the Filter alias list.

band: Optional[str] = None

The generic name of a filter not associated with a particular instrument (e.g. r for the SDSS Gunn r-band, which could be on SDSS, LSST, or HSC).

Not all filters have an abstract filter: engineering or test filters may not have a genericly-termed filter name.

If specified and if afw_name is None, this is used as the Filter name field, otherwise it is added to the list of Filter aliases.

doc: Optional[str] = None

A short description of this filter, possibly with a link to more information.

Methods Documentation

makeFilterLabel() → FilterLabel

Create a complete FilterLabel for this filter.