LSSTApplications
19.0.0-14-gb0260a2+72efe9b372,20.0.0+7927753e06,20.0.0+8829bf0056,20.0.0+995114c5d2,20.0.0+b6f4b2abd1,20.0.0+bddc4f4cbe,20.0.0-1-g253301a+8829bf0056,20.0.0-1-g2b7511a+0d71a2d77f,20.0.0-1-g5b95a8c+7461dd0434,20.0.0-12-g321c96ea+23efe4bbff,20.0.0-16-gfab17e72e+fdf35455f6,20.0.0-2-g0070d88+ba3ffc8f0b,20.0.0-2-g4dae9ad+ee58a624b3,20.0.0-2-g61b8584+5d3db074ba,20.0.0-2-gb780d76+d529cf1a41,20.0.0-2-ged6426c+226a441f5f,20.0.0-2-gf072044+8829bf0056,20.0.0-2-gf1f7952+ee58a624b3,20.0.0-20-geae50cf+e37fec0aee,20.0.0-25-g3dcad98+544a109665,20.0.0-25-g5eafb0f+ee58a624b3,20.0.0-27-g64178ef+f1f297b00a,20.0.0-3-g4cc78c6+e0676b0dc8,20.0.0-3-g8f21e14+4fd2c12c9a,20.0.0-3-gbd60e8c+187b78b4b8,20.0.0-3-gbecbe05+48431fa087,20.0.0-38-ge4adf513+a12e1f8e37,20.0.0-4-g97dc21a+544a109665,20.0.0-4-gb4befbc+087873070b,20.0.0-4-gf910f65+5d3db074ba,20.0.0-5-gdfe0fee+199202a608,20.0.0-5-gfbfe500+d529cf1a41,20.0.0-6-g64f541c+d529cf1a41,20.0.0-6-g9a5b7a1+a1cd37312e,20.0.0-68-ga3f3dda+5fca18c6a4,20.0.0-9-g4aef684+e18322736b,w.2020.45
LSSTDataManagementBasePackage
|
Classes | |
class | DcrModel |
Functions | |
def | applyDcr (image, dcr, useInverse=False, splitSubfilters=False, splitThreshold=0., doPrefilter=True, order=3) |
def | calculateDcr (visitInfo, wcs, effectiveWavelength, bandwidth, dcrNumSubfilters, splitSubfilters=False) |
def | calculateImageParallacticAngle (visitInfo, wcs) |
def | wavelengthGenerator (effectiveWavelength, bandwidth, dcrNumSubfilters) |
def lsst.ip.diffim.dcrModel.applyDcr | ( | image, | |
dcr, | |||
useInverse = False , |
|||
splitSubfilters = False , |
|||
splitThreshold = 0. , |
|||
doPrefilter = True , |
|||
order = 3 |
|||
) |
Shift an image along the X and Y directions. Parameters ---------- image : `numpy.ndarray` The input image to shift. dcr : `tuple` Shift calculated with ``calculateDcr``. Uses numpy axes ordering (Y, X). If ``splitSubfilters`` is set, each element is itself a `tuple` of two `float`, corresponding to the DCR shift at the two wavelengths. Otherwise, each element is a `float` corresponding to the DCR shift at the effective wavelength of the subfilter. useInverse : `bool`, optional Apply the shift in the opposite direction. Default: False splitSubfilters : `bool`, optional Calculate DCR for two evenly-spaced wavelengths in each subfilter, instead of at the midpoint. Default: False splitThreshold : `float`, optional Minimum DCR difference within a subfilter required to use ``splitSubfilters`` doPrefilter : `bool`, optional Spline filter the image before shifting, if set. Filtering is required, so only set to False if the image is already filtered. Filtering takes ~20% of the time of shifting, so if `applyDcr` will be called repeatedly on the same image it is more efficient to precalculate the filter. order : `int`, optional The order of the spline interpolation, default is 3. Returns ------- shiftedImage : `numpy.ndarray` A copy of the input image with the specified shift applied.
Definition at line 696 of file dcrModel.py.
def lsst.ip.diffim.dcrModel.calculateDcr | ( | visitInfo, | |
wcs, | |||
effectiveWavelength, | |||
bandwidth, | |||
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. effectiveWavelength : `float` The effective wavelengths of the current filter, in nanometers. bandwidth : `float` The bandwidth of the current filter, in nanometers. 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).
Definition at line 762 of file dcrModel.py.
def lsst.ip.diffim.dcrModel.calculateImageParallacticAngle | ( | visitInfo, | |
wcs | |||
) |
Calculate the total sky rotation angle of an exposure. Parameters ---------- visitInfo : `lsst.afw.image.VisitInfo` Metadata for the exposure. wcs : `lsst.afw.geom.SkyWcs` Coordinate system definition (wcs) for the exposure. Returns ------- `lsst.geom.Angle` The rotation of the image axis, East from North. Equal to the parallactic angle plus any additional rotation of the coordinate system. A rotation angle of 0 degrees is defined with North along the +y axis and East along the +x axis. A rotation angle of 90 degrees is defined with North along the +x axis and East along the -y axis.
Definition at line 818 of file dcrModel.py.
def lsst.ip.diffim.dcrModel.wavelengthGenerator | ( | effectiveWavelength, | |
bandwidth, | |||
dcrNumSubfilters | |||
) |
Iterate over the wavelength endpoints of subfilters. Parameters ---------- effectiveWavelength : `float` The effective wavelength of the current filter, in nanometers. bandwidth : `float` The bandwidth of the current filter, in nanometers. dcrNumSubfilters : `int` Number of sub-filters used to model chromatic effects within a band. Yields ------ `tuple` of two `float` The next set of wavelength endpoints for a subfilter, in nanometers.
Definition at line 850 of file dcrModel.py.