Coverage for python/lsst/afw/geom/skyWcs.py : 44%

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1# This file is part of afw.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (https://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <https://www.gnu.org/licenses/>.
22import numpy as np
24from lsst.utils import continueClass
25from ._python import reduceTransform
26from ._geom import (SkyWcs, makeCdMatrix, makeFlippedWcs, makeModifiedWcs,
27 makeSkyWcs, makeTanSipWcs, makeWcsPairTransform,
28 getIntermediateWorldCoordsToSky, getPixelToIntermediateWorldCoords)
30__all__ = ["SkyWcs", "makeCdMatrix", "makeFlippedWcs", "makeSkyWcs",
31 "makeModifiedWcs", "makeTanSipWcs", "makeWcsPairTransform",
32 "getIntermediateWorldCoordsToSky", "getPixelToIntermediateWorldCoords"]
35@continueClass # noqa: F811 (FIXME: remove for py 3.8+)
36class SkyWcs: # noqa: F811
37 def pixelToSkyArray(self, x, y, degrees=False):
38 """
39 Convert numpy array pixels (x, y) to numpy array sky (ra, dec)
40 positions.
42 Parameters
43 ----------
44 x : `np.ndarray`
45 Array of x values.
46 y : `np.ndarray`
47 Array of y values.
48 degrees : `bool`, optional
49 Return ra, dec arrays in degrees if True.
51 Returns
52 -------
53 ra : `np.ndarray`
54 Array of Right Ascension. Units are radians unless
55 degrees=True.
56 dec : `np.ndarray`
57 Array of Declination. Units are radians unless
58 degrees=True.
59 """
60 xy = np.vstack((x, y))
61 ra, dec = np.vsplit(self.getTransform().getMapping().applyForward(xy), 2)
62 ra %= (2.*np.pi)
64 if degrees:
65 return np.rad2deg(ra.ravel()), np.rad2deg(dec.ravel())
66 else:
67 return ra.ravel(), dec.ravel()
69 def skyToPixelArray(self, ra, dec, degrees=False):
70 """
71 Convert numpy array sky (ra, dec) positions to numpy array
72 pixels (x, y).
74 Parameters
75 ----------
76 ra : `np.ndarray`
77 Array of Right Ascension. Units are radians unless
78 degrees=True.
79 dec : `np.ndarray`
80 Array of Declination. Units are radians unless
81 degrees=True.
82 degrees : `bool`, optional
83 Input ra, dec arrays are degrees if True.
85 Returns
86 -------
87 x : `np.ndarray`
88 Array of x values.
89 y : `np.ndarray`
90 Array of y values.
91 """
92 radec = np.vstack((ra, dec))
93 if degrees:
94 radec = np.deg2rad(radec)
96 x, y = np.vsplit(self.getTransform().getMapping().applyInverse(radec), 2)
98 return x.ravel(), y.ravel()
101SkyWcs.__reduce__ = reduceTransform