[1708] | 1 | //#--------------------------------------------------------------------------- |
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| 2 | //# STAtmosphere.h: Model of atmospheric opacity |
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| 3 | //#--------------------------------------------------------------------------- |
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| 4 | //# Copyright (C) 2004 |
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| 5 | //# ATNF |
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| 6 | //# |
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| 7 | //# The code is based on the Fortran code written by Bob Sault for MIRIAD. |
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| 8 | //# Converted to C++ by Max Voronkov. This code uses a simple model of the |
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| 9 | //# atmosphere and Liebe's model (1985) of the complex refractive index of |
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| 10 | //# air. |
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| 11 | //# |
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| 12 | //# The model of the atmosphere is one with an exponential fall-off in |
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| 13 | //# the water vapour content (scale height of 1540 m) and a temperature lapse |
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| 14 | //# rate of 6.5 mK/m. Otherwise the atmosphere obeys the ideal gas equation |
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| 15 | //# and hydrostatic equilibrium. |
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| 16 | //# |
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| 17 | //# This program is free software; you can redistribute it and/or modify it |
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| 18 | //# under the terms of the GNU General Public License as published by the Free |
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| 19 | //# Software Foundation; either version 2 of the License, or (at your option) |
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| 20 | //# any later version. |
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| 21 | //# |
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| 22 | //# This program is distributed in the hope that it will be useful, but |
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| 23 | //# WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 24 | //# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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| 25 | //# Public License for more details. |
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| 26 | //# |
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| 27 | //# You should have received a copy of the GNU General Public License along |
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| 28 | //# with this program; if not, write to the Free Software Foundation, Inc., |
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| 29 | //# 675 Massachusetts Ave, Cambridge, MA 02139, USA. |
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| 30 | //# |
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| 31 | //# Correspondence concerning this software should be addressed as follows: |
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| 32 | //# Internet email: Malte.Marquarding@csiro.au |
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| 33 | //# Postal address: Malte Marquarding, |
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| 34 | //# Australia Telescope National Facility, |
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| 35 | //# P.O. Box 76, |
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| 36 | //# Epping, NSW, 2121, |
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| 37 | //# AUSTRALIA |
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| 38 | //# |
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| 39 | //# $Id: STAtmosphere.h 1346 2007-04-26 03:24:41Z mar637 $ |
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| 40 | //#--------------------------------------------------------------------------- |
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| 41 | |
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| 42 | // own includes |
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| 43 | #include "STAtmosphere.h" |
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| 44 | |
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| 45 | // casa includes |
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| 46 | #include <casa/Utilities/Assert.h> |
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| 47 | |
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| 48 | using namespace casa; |
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| 49 | using namespace asap; |
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| 50 | |
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| 51 | /** |
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| 52 | * Default Constructor (apart from optional parameters). |
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| 53 | * The class set up this way will assume International Standard Atmosphere (ISA) conditions, |
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| 54 | * except for humidity. The latter is assumed to be 50%, which seems more realistic for |
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| 55 | * Australian telescopes than 0%. |
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| 56 | * @param[in] wvScale water vapour scale height (m), default is 1540m to match MIRIAD's model |
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| 57 | * @param[in] maxAlt maximum altitude of the model atmosphere (m), plane parallel layers are spread linearly up to |
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| 58 | * this height, default is 10000m to match MIRIAD. |
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| 59 | * @param[in] nLayers number of plane parallel layers in the model (essentially for a numberical integration), |
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| 60 | * default is 50 to match MIRIAD. |
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| 61 | **/ |
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| 62 | STAtmosphere::STAtmosphere(double wvScale, double maxAlt, size_t nLayers) : |
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| 63 | itsGndTemperature(288.), itsPressure(101325.), itsHumidity(0.5), |
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| 64 | itsLapseRate(0.0065), itsWVScale(wvScale), itsMaxAlt(maxAlt), |
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| 65 | itsHeights(nLayers), itsTemperatures(nLayers), |
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| 66 | itsDryPressures(nLayers), itsVapourPressures(nLayers) |
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| 67 | { |
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| 68 | recomputeAtmosphereModel(); |
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| 69 | } |
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| 70 | |
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| 71 | /** |
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| 72 | * Constructor with explicitly given parameters of the atmosphere |
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| 73 | * @param[in] temperature air temperature at the observatory (K) |
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| 74 | * @param[in] pressure air pressure at the observatory (Pascals) |
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| 75 | * @param[in] humidity air humidity at the observatory (fraction) |
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| 76 | * @param[in] lapseRate temperature lapse rate (K/m), default is 0.0065 K/m to match MIRIAD and ISA |
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| 77 | * @param[in] wvScale water vapour scale height (m), default is 1540m to match MIRIAD's model |
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| 78 | * @param[in] maxAlt maximum altitude of the model atmosphere (m), plane parallel layers are spread linearly up to |
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| 79 | * this height, default is 10000m to match MIRIAD. |
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| 80 | * @param[in] nLayers number of plane parallel layers in the model (essentially for a numberical integration), |
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| 81 | * default is 50 to match MIRIAD. |
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| 82 | **/ |
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| 83 | STAtmosphere::STAtmosphere(double temperature, double pressure, double humidity, double lapseRate, |
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| 84 | double wvScale, double maxAlt, size_t nLayers) : |
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| 85 | itsGndTemperature(temperature), itsPressure(pressure), itsHumidity(humidity), |
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| 86 | itsLapseRate(lapseRate), itsWVScale(wvScale), itsMaxAlt(maxAlt), |
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| 87 | itsHeights(nLayers), itsTemperatures(nLayers), |
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| 88 | itsDryPressures(nLayers), itsVapourPressures(nLayers) |
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| 89 | { |
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| 90 | recomputeAtmosphereModel(); |
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| 91 | } |
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| 92 | |
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| 93 | /** |
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| 94 | * Set the new weather station data, recompute the model |
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| 95 | * @param[in] temperature air temperature at the observatory (K) |
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| 96 | * @param[in] pressure air pressure at the observatory (Pascals) |
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| 97 | * @param[in] humidity air humidity at the observatory (fraction) |
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| 98 | **/ |
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| 99 | void STAtmosphere::setWeather(double temperature, double pressure, double humidity) |
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| 100 | { |
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| 101 | itsGndTemperature = temperature; |
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| 102 | itsPressure = pressure; |
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| 103 | itsHumidity = humidity; |
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| 104 | recomputeAtmosphereModel(); |
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| 105 | } |
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| 106 | |
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| 107 | /** |
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| 108 | * Build the atmosphere model based on exponential fall-off, ideal gas and hydrostatic |
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| 109 | * equilibrium. The model parameters are taken from the data members of this class. |
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| 110 | **/ |
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| 111 | void STAtmosphere::recomputeAtmosphereModel() |
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| 112 | { |
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| 113 | } |
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| 114 | |
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| 115 | /** |
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| 116 | * Obtain the number of model layers, do consistency check that everything is |
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| 117 | * resized accordingly |
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| 118 | * @retrun number of model layers |
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| 119 | **/ |
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| 120 | size_t STAtmosphere::nLayers() const |
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| 121 | { |
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| 122 | const size_t result = itsHeights.size(); |
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| 123 | DebugAssert(itsTemperatures.size() == result, AipsError); |
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| 124 | DebugAssert(itsDryPressures.size() == result, AipsError); |
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| 125 | DebugAssert(itsVapourPressures.size() == result, AipsError); |
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| 126 | return result; |
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| 127 | } |
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| 128 | |
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