calculateDcr

lsst.ip.diffim.calculateDcr(visitInfo, wcs, filterInfo, dcrNumSubfilters, splitSubfilters=False)

Calculate the shift in pixels of an exposure due to DCR.

Parameters:

visitInfo : lsst.afw.image.VisitInfo

Metadata for the exposure.

wcs : lsst.afw.geom.SkyWcs

Coordinate system definition (wcs) for the exposure.

filterInfo : lsst.afw.image.Filter

The filter definition, set in the current instruments’ obs package.

dcrNumSubfilters : int

Number of sub-filters used to model chromatic effects within a band.

splitSubfilters : bool, optional

Calculate DCR for two evenly-spaced wavelengths in each subfilter, instead of at the midpoint. Default: False

Returns:

dcrShift : tuple of two float

The 2D shift due to DCR, in pixels. Uses numpy axes ordering (Y, X).