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LSST Data Management Base Package
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Calib.h
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1// -*- lsst-c++ -*-
2
3/*
4 * LSST Data Management System
5 * Copyright 2008, 2009, 2010 LSST Corporation.
6 *
7 * This product includes software developed by the
8 * LSST Project (http://www.lsst.org/).
9 *
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the LSST License Statement and
21 * the GNU General Public License along with this program. If not,
22 * see <http://www.lsstcorp.org/LegalNotices/>.
23 */
24
25//
26/*
27 * Classes to support calibration (e.g. photometric zero points, exposure times)
28 */
29#ifndef LSST_AFW_IMAGE_CALIB_H
30#define LSST_AFW_IMAGE_CALIB_H
31
32#include <cmath>
33#include <utility>
34#include <memory>
35#include "ndarray_fwd.h"
36#include "lsst/base.h"
38#include "lsst/pex/exceptions.h"
39#include "lsst/geom/Point.h"
41
42namespace lsst {
43namespace afw {
44namespace image {
45
46// NOTE: This value has been kept for backwards compatibility with old Calib conversions.
47// It is not precise and should not be hard coded in new code. Instead, use astropy in python:
48//
49// import astropy.units as u
50// magnitude = <array or single magnitude value>
51// (magnitude*u.ABmag).to_value(u.nJy)
52//
53// or see `cpputils/include/lsst/cpputils/Magnitude.h` for C++ flux/magnitude conversion tools.
54static double const JanskysPerABFlux = 3631.0;
55
57inline double abMagFromFlux(double flux) { return -2.5 * std::log10(flux / JanskysPerABFlux); }
58
60inline double abMagErrFromFluxErr(double fluxErr, double flux) {
61 return std::abs(fluxErr / (-0.4 * flux * std::log(10)));
62}
63
65inline double fluxFromABMag(double mag) noexcept { return std::pow(10.0, -0.4 * mag) * JanskysPerABFlux; }
66
68inline double fluxErrFromABMagErr(double magErr, double mag) noexcept {
69 return std::abs(-0.4 * magErr * fluxFromABMag(mag) * std::log(10.0));
70}
71
73template <typename T>
74ndarray::Array<T, 1> abMagFromFlux(ndarray::Array<T const, 1> const& flux);
75
77template <typename T>
78ndarray::Array<T, 1> abMagErrFromFluxErr(ndarray::Array<T const, 1> const& fluxErr,
79 ndarray::Array<T const, 1> const& flux);
80
82template <typename T>
83ndarray::Array<T, 1> fluxFromABMag(ndarray::Array<T const, 1> const& mag);
84
86template <typename T>
87ndarray::Array<T, 1> fluxErrFromABMagErr(ndarray::Array<T const, 1> const& magErr,
88 ndarray::Array<T const, 1> const& mag);
89
90} // namespace image
91} // namespace afw
92} // namespace lsst
93
94#endif // LSST_AFW_IMAGE_CALIB_H
Interface for DateTime class.
Basic LSST definitions.
T log10(T... args)
T log(T... args)
double abMagErrFromFluxErr(double fluxErr, double flux)
Compute AB magnitude error from flux and flux error in Janskys.
Definition Calib.h:60
double fluxErrFromABMagErr(double magErr, double mag) noexcept
Compute flux error in Janskys from AB magnitude error and AB magnitude.
Definition Calib.h:68
double abMagFromFlux(double flux)
Compute AB magnitude from flux in Janskys.
Definition Calib.h:57
double fluxFromABMag(double mag) noexcept
Compute flux in Janskys from AB magnitude.
Definition Calib.h:65
T pow(T... args)