how to insert a geomagnetic equator line in the map plot

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raja adibah 2025-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/2176508-how-to-insert-a-geomagnetic-equator-line-in-the-map-plot

编辑： ScottB 2025-4-22

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Hi i had problem to insert geomagnetic equator line into the current map, can anyone help

here is my code and the figure that i want to insert the geomagnetic equator line

% Define station coordinates
stations = {
    'Langkawi (LKW)', 6.32, 99.85;
    'Terengganu (TRE)', 5.33, 103.15;
    'Johor (JOH)', 1.49, 103.76;
    'Ranau (RAN)', 5.96, 116.67
    };
% Create a world map focused on Malaysia
figure;
worldmap([0 12], [90 122]);
load coastlines
geoshow(coastlat, coastlon, 'DisplayType', 'polygon', 'FaceColor', [0.8 0.8 0.8]);
% Add country borders
borders = shaperead('landareas', 'UseGeoCoords', true);
geoshow(borders, 'FaceColor', 'none', 'EdgeColor', [0.5 0.5 0.5]);
% Add station points
for i = 1:size(stations,1)
    lat = stations{i,2};
    lon = stations{i,3};
    textm(lat+0.2, lon, stations{i,1}, 'Color', 'r', 'FontWeight', 'bold');
    plotm(lat, lon, 'ro', 'MarkerFaceColor', 'r');
end
% Add legend and title
title('Station Locations in Malaysia with Geomagnetic Equator');

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Les Beckham 2025-4-22

You haven't shown the code which you used to try to insert the geomagnetic equator line, nor have you shown what the problem is. Please update your question to show what the issue is.