mirror of
https://github.com/Richard-Sti/csiborgtools.git
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57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
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# Copyright (C) 2022 Richard Stiskalek
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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import numpy
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def cartesian_to_radec(arr, xpar="peak_x", ypar="peak_y", zpar="peak_z", degrees=True):
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"""
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Extract `x`, `y`, and `z` coordinates from a record array `arr` and
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calculate their spherical coordinates representation.
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Parameters
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----------
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arr : record array
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Record array with the Cartesian coordinates.
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xpar : str, optional
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Name of the x coordinate in the record array.
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ypar : str, optional
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Name of the y coordinate in the record array.
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zpar : str, optional
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Name of the z coordinate in the record array.
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degrees : bool, optional
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Whether to return angles in degrees. By default `True`.
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Returns
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-------
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dist : 1-dimensional array
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Radial distance.
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ra : 1-dimensional array
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Right ascension.
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dec : 1-dimensional array
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Declination.
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"""
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x, y, z = arr[xpar], arr[ypar], arr[zpar]
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dist = numpy.sqrt(x**2 + y**2 + z**2)
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dec = numpy.arcsin(z / dist)
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ra = numpy.arctan2(y, x)
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if degrees:
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dec = numpy.rad2deg(dec)
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ra = numpy.rad2deg(ra)
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return dist, ra, dec
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