142 lines
5.1 KiB
C++
142 lines
5.1 KiB
C++
/********************************************************
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* ██████╗ ██████╗████████╗██╗
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* ██╔════╝ ██╔════╝╚══██╔══╝██║
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* ██║ ███╗██║ ██║ ██║
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* ██║ ██║██║ ██║ ██║
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* ╚██████╔╝╚██████╗ ██║ ███████╗
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* ╚═════╝ ╚═════╝ ╚═╝ ╚══════╝
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* Geophysical Computational Tools & Library (GCTL)
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*
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* Copyright (c) 2023 Yi Zhang (yizhang-geo@zju.edu.cn)
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*
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* GCTL is distributed under a dual licensing scheme. You can redistribute
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* it and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, either version 2
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* of the License, or (at your option) any later version. You should have
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* received a copy of the GNU Lesser General Public License along with this
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* program. If not, see <http://www.gnu.org/licenses/>.
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*
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* If the terms and conditions of the LGPL v.2. would prevent you from using
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* the GCTL, please consider the option to obtain a commercial license for a
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* fee. These licenses are offered by the GCTL's original author. As a rule,
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* licenses are provided "as-is", unlimited in time for a one time fee. Please
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* send corresponding requests to: yizhang-geo@zju.edu.cn. Please do not forget
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* to include some description of your company and the realm of its activities.
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* Also add information on how to contact you by electronic and paper mail.
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******************************************************/
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#ifndef _VARIOGRAM_H
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#define _VARIOGRAM_H
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#include "../core/macro.h"
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namespace gctl
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{
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/**
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* @brief variogram function type
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*/
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enum variogram_type_e
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{
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SPHERICAL,
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EXPONENTIAL,
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GAUSSIAN,
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WAVE,
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RATIONAL_Q,
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CIRCULAR,
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LINEAR,
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};
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/**
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* @brief variogram model structure
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*/
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struct variogram_model
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{
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double nugget;
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double sill;
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double range;
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bool valid();
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};
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/**
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* @brief Spherical Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double spherical_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Exponential Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double exponential_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Gaussian Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double gaussian_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Wave Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double wave_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Rational Quadratic Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double rational_quadratic_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Circular Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double circular_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Linear Semi-variogram Model based on http://spatial-analyst.net/ILWIS/htm/ilwisapp/sec/semivar_models_sec.html
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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*
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* @return Semi-variogram value
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*/
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double linear_variogram(const double &d, const variogram_model &vm);
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/**
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* @brief Integral variogram function
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*
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* @param[in] d distance between points to covariant
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* @param[in] vm variogram model
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* @param[in] type variogram function type
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*
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* @return Semi-variogram value
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*/
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double variogram(const double &d, const variogram_model &vm, variogram_type_e type);
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}
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#endif // _VARIOGRAM_H
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