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GPT and GMF

version 2.0.0 (15.6 KB) by Changyong He
Vectorized version of the Matlab code for the GMP and GPT models

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Updated 19 Oct 2019

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Vectorized version of the Matlab code for the GMP and GPT models. Original Fortran and Matlab code can be found in IERS 2010 Conventions (http://iers-conventions.obspm.fr/conventions_versions.php#official_target) and
Vienna Mapping Functions Open Access Data (http://vmf.geo.tuwien.ac.at/codes/)

Test example (Matlab code):

n = 86400;
%% GMF
dmjd = 55055*ones(n,1);
dlat = 0.6708665767*ones(n,1);
dlon = -1.393397187*ones(n,1);
dhgt = 844.715*ones(n,1);
zd = 1.278564131*ones(n,1);
tic
[gmfh,gmfw] = gmf(dmjd,dlat,dlon,dhgt,zd);
toc
% Test case:
% given input: DMJD = 55055D0
% DLAT = 0.6708665767D0 radians (NRAO, Green Bank, WV)
% DLON = -1.393397187D0 radians
% DHGT = 844.715D0 meters
% ZD = 1.278564131D0 radians
%
% expected output: GMFH = 3.425245519339138678 11.064702723565059
% GMFW = 3.449589116182419257 11.313101285827178
fprintf('GMF %.15f\t%.15f\n', gmfh(1), gmfw(1));
fprintf('\n');

tic
[gmfh,gmfw] = gmf_deriv(dmjd,dlat,dlon,dhgt,zd);
toc
fprintf('GMF_deriv %.15f\t%.15f\t%.15f\t%.15f\n', gmfh(1,:), gmfw(1,:));
fprintf('\n');
%% GPT
dmjd = 55055*ones(n,1);
dlat = 0.6708665767*ones(n,1);
dlon = -1.393397187*ones(n,1);
dhgt = 812.546*ones(n,1);
tic
[pres,temp,undu] = gpt(dmjd , dlat , dlon , dhgt);
toc
% Test case:
% given input: DMJD = 55055D0
% DLAT = 0.6708665767D0 radians (NRAO, Green Bank, WV)
% DLON = -1.393397187D0 radians
% DHGT = 812.546 meters
% expected output: PRES = 918.0710638757363995D0 hPa
% TEMP = 19.31914181012882992D0 degrees Celsius
% UNDU = -42.19185643717770517D0 meters
fprintf('GPT %.15f\t%.15f\t%.15f\n', pres(1), temp(1), undu(1));
fprintf('\n');

Enjoy!

Cite As

Changyong He (2020). GPT and GMF (https://www.mathworks.com/matlabcentral/fileexchange/73066-gpt-and-gmf), MATLAB Central File Exchange. Retrieved .

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MATLAB Release Compatibility
Created with R2019b
Compatible with any release
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