LSST Applications
21.0.0-147-g0e635eb1+1acddb5be5,22.0.0+052faf71bd,22.0.0+1ea9a8b2b2,22.0.0+6312710a6c,22.0.0+729191ecac,22.0.0+7589c3a021,22.0.0+9f079a9461,22.0.1-1-g7d6de66+b8044ec9de,22.0.1-1-g87000a6+536b1ee016,22.0.1-1-g8e32f31+6312710a6c,22.0.1-10-gd060f87+016f7cdc03,22.0.1-12-g9c3108e+df145f6f68,22.0.1-16-g314fa6d+c825727ab8,22.0.1-19-g93a5c75+d23f2fb6d8,22.0.1-19-gb93eaa13+aab3ef7709,22.0.1-2-g8ef0a89+b8044ec9de,22.0.1-2-g92698f7+9f079a9461,22.0.1-2-ga9b0f51+052faf71bd,22.0.1-2-gac51dbf+052faf71bd,22.0.1-2-gb66926d+6312710a6c,22.0.1-2-gcb770ba+09e3807989,22.0.1-20-g32debb5+b8044ec9de,22.0.1-23-gc2439a9a+fb0756638e,22.0.1-3-g496fd5d+09117f784f,22.0.1-3-g59f966b+1e6ba2c031,22.0.1-3-g849a1b8+f8b568069f,22.0.1-3-gaaec9c0+c5c846a8b1,22.0.1-32-g5ddfab5d3+60ce4897b0,22.0.1-4-g037fbe1+64e601228d,22.0.1-4-g8623105+b8044ec9de,22.0.1-5-g096abc9+d18c45d440,22.0.1-5-g15c806e+57f5c03693,22.0.1-7-gba73697+57f5c03693,master-g6e05de7fdc+c1283a92b8,master-g72cdda8301+729191ecac,w.2021.39
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.