lsst.afw.geom.skyWcs.SkyWcs Class Reference

Public Member Functions
def	pixelToSkyArray (self, x, y, degrees=False)
def	skyToPixelArray (self, ra, dec, degrees=False)

Detailed Description

Definition at line 36 of file skyWcs.py.

Member Function Documentation

pixelToSkyArray()

def lsst.afw.geom.skyWcs.SkyWcs.pixelToSkyArray	(		self,
			x,
			y,
			degrees = False
	)

Convert numpy array pixels (x, y) to numpy array sky (ra, dec)
positions.

Parameters
----------
x : `np.ndarray`
    Array of x values.
y : `np.ndarray`
    Array of y values.
degrees : `bool`, optional
    Return ra, dec arrays in degrees if True.

Returns
-------
ra : `np.ndarray`
    Array of Right Ascension.  Units are radians unless
    degrees=True.
dec : `np.ndarray`
    Array of Declination.  Units are radians unless
    degrees=True.

Definition at line 37 of file skyWcs.py.

    def pixelToSkyArray(self, x, y, degrees=False):
        """
        Convert numpy array pixels (x, y) to numpy array sky (ra, dec)
        positions.
 
        Parameters
        ----------
        x : `np.ndarray`
            Array of x values.
        y : `np.ndarray`
            Array of y values.
        degrees : `bool`, optional
            Return ra, dec arrays in degrees if True.
 
        Returns
        -------
        ra : `np.ndarray`
            Array of Right Ascension.  Units are radians unless
            degrees=True.
        dec : `np.ndarray`
            Array of Declination.  Units are radians unless
            degrees=True.
        """
        xy = np.vstack((x, y))
        ra, dec = np.vsplit(self.getTransform().getMapping().applyForward(xy), 2)
        ra %= (2.*np.pi)
 
        if degrees:
            return np.rad2deg(ra.ravel()), np.rad2deg(dec.ravel())
        else:
            return ra.ravel(), dec.ravel()
 

skyToPixelArray()

def lsst.afw.geom.skyWcs.SkyWcs.skyToPixelArray	(		self,
			ra,
			dec,
			degrees = False
	)

Convert numpy array sky (ra, dec) positions to numpy array
pixels (x, y).

Parameters
----------
ra : `np.ndarray`
    Array of Right Ascension.  Units are radians unless
    degrees=True.
dec : `np.ndarray`
    Array of Declination.  Units are radians unless
    degrees=True.
degrees : `bool`, optional
    Input ra, dec arrays are degrees if True.

Returns
-------
x : `np.ndarray`
    Array of x values.
y : `np.ndarray`
    Array of y values.

Definition at line 69 of file skyWcs.py.

    def skyToPixelArray(self, ra, dec, degrees=False):
        """
        Convert numpy array sky (ra, dec) positions to numpy array
        pixels (x, y).
 
        Parameters
        ----------
        ra : `np.ndarray`
            Array of Right Ascension.  Units are radians unless
            degrees=True.
        dec : `np.ndarray`
            Array of Declination.  Units are radians unless
            degrees=True.
        degrees : `bool`, optional
            Input ra, dec arrays are degrees if True.
 
        Returns
        -------
        x : `np.ndarray`
            Array of x values.
        y : `np.ndarray`
            Array of y values.
        """
        radec = np.vstack((ra, dec))
        if degrees:
            radec = np.deg2rad(radec)
 
        x, y = np.vsplit(self.getTransform().getMapping().applyInverse(radec), 2)
 
        return x.ravel(), y.ravel()
 
 
SkyWcs.__reduce__ = reduceTransform

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The documentation for this class was generated from the following file:

• /j/snowflake/release/lsstsw/stack/0.4.3/Linux64/afw/21.0.0-25-g1d57be3cd+e73869a214/python/lsst/afw/geom/skyWcs.py