LSST Applications
21.0.0-172-gfb10e10a+18fedfabac,22.0.0+297cba6710,22.0.0+80564b0ff1,22.0.0+8d77f4f51a,22.0.0+a28f4c53b1,22.0.0+dcf3732eb2,22.0.1-1-g7d6de66+2a20fdde0d,22.0.1-1-g8e32f31+297cba6710,22.0.1-1-geca5380+7fa3b7d9b6,22.0.1-12-g44dc1dc+2a20fdde0d,22.0.1-15-g6a90155+515f58c32b,22.0.1-16-g9282f48+790f5f2caa,22.0.1-2-g92698f7+dcf3732eb2,22.0.1-2-ga9b0f51+7fa3b7d9b6,22.0.1-2-gd1925c9+bf4f0e694f,22.0.1-24-g1ad7a390+a9625a72a8,22.0.1-25-g5bf6245+3ad8ecd50b,22.0.1-25-gb120d7b+8b5510f75f,22.0.1-27-g97737f7+2a20fdde0d,22.0.1-32-gf62ce7b1+aa4237961e,22.0.1-4-g0b3f228+2a20fdde0d,22.0.1-4-g243d05b+871c1b8305,22.0.1-4-g3a563be+32dcf1063f,22.0.1-4-g44f2e3d+9e4ab0f4fa,22.0.1-42-gca6935d93+ba5e5ca3eb,22.0.1-5-g15c806e+85460ae5f3,22.0.1-5-g58711c4+611d128589,22.0.1-5-g75bb458+99c117b92f,22.0.1-6-g1c63a23+7fa3b7d9b6,22.0.1-6-g50866e6+84ff5a128b,22.0.1-6-g8d3140d+720564cf76,22.0.1-6-gd805d02+cc5644f571,22.0.1-8-ge5750ce+85460ae5f3,master-g6e05de7fdc+babf819c66,master-g99da0e417a+8d77f4f51a,w.2021.48
LSST Data Management Base Package
|
Classes | |
class | BoxGrid |
class | FrameSetInfo |
class | PermutedFrameSet |
class | TransformTestBaseClass |
Functions | |
def | makeSipPolyMapCoeffs (metadata, name) |
def | makeSipIwcToPixel (metadata) |
def | makeSipPixelToIwc (metadata) |
def lsst.afw.geom.testUtils.makeSipIwcToPixel | ( | metadata | ) |
Make an IWC to pixel transform with SIP distortion from FITS-WCS metadata This function is primarily intended for unit tests. IWC is intermediate world coordinates, as described in the FITS papers. Parameters ---------- metadata : lsst.daf.base.PropertySet FITS metadata describing a WCS with inverse SIP coefficients Returns ------- lsst.afw.geom.TransformPoint2ToPoint2 Transform from IWC position to pixel position (zero-based) in the forward direction. The inverse direction is not defined. Notes ----- The inverse SIP terms APn_m, BPn_m are polynomial coefficients x^n y^m for computing transformed x, y respectively. If we call the resulting polynomial inverseSipPolynomial, the returned transformation is: pixelPosition = pixel origin + uv + inverseSipPolynomial(uv) where uv = inverseCdMatrix * iwcPosition
Definition at line 196 of file testUtils.py.
def lsst.afw.geom.testUtils.makeSipPixelToIwc | ( | metadata | ) |
Make a pixel to IWC transform with SIP distortion from FITS-WCS metadata This function is primarily intended for unit tests. IWC is intermediate world coordinates, as described in the FITS papers. Parameters ---------- metadata : lsst.daf.base.PropertySet FITS metadata describing a WCS with forward SIP coefficients Returns ------- lsst.afw.geom.TransformPoint2ToPoint2 Transform from pixel position (zero-based) to IWC position in the forward direction. The inverse direction is not defined. Notes ----- The forward SIP terms An_m, Bn_m are polynomial coefficients x^n y^m for computing transformed x, y respectively. If we call the resulting polynomial sipPolynomial, the returned transformation is: iwcPosition = cdMatrix * (dxy + sipPolynomial(dxy)) where dxy = pixelPosition - pixelOrigin
Definition at line 235 of file testUtils.py.
def lsst.afw.geom.testUtils.makeSipPolyMapCoeffs | ( | metadata, | |
name | |||
) |
Return a list of ast.PolyMap coefficients for the specified SIP matrix The returned list of coefficients for an ast.PolyMap that computes the following function: f(dxy) = dxy + sipPolynomial(dxy)) where dxy = pixelPosition - pixelOrigin and sipPolynomial is a polynomial with terms `<name>n_m for x^n y^m` (e.g. A2_0 is the coefficient for x^2 y^0) Parameters ---------- metadata : lsst.daf.base.PropertySet FITS metadata describing a WCS with the specified SIP coefficients name : str The desired SIP terms: one of A, B, AP, BP Returns ------- list A list of coefficients for an ast.PolyMap that computes the specified SIP polynomial, including a term for out = in Note ---- This is an internal function for use by makeSipIwcToPixel and makeSipPixelToIwc
Definition at line 141 of file testUtils.py.