how to draw a section of current at a given latitude according to longitude and depth?
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Khalifa ababacar Ndoye
el 22 de Mayo de 2023
Section of current at a single latitude.i have a NetCDF file with current components as u and v.
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Vinay
el 12 de Ag. de 2024 a las 10:38
Editada: Vinay
el 12 de Ag. de 2024 a las 10:45
Hii Khalifa,
The target latitude where current section to be defined needs to be compared with the latitude in the dataset and closet latitude has to be identified.Extract the U and V components of the current at this latitude and compute the magnitude. Use the “pcolor” function to plot the current magnitude, with longitude represented on the x-axis and depth on the y-axis.
Kindly refer to the following documentations for “pcolor” function:
I hope this helps!
%Custom dataset
longitudes = linspace(-180, 180, 50);
latitudes = linspace(-90, 90, 30);
depths = linspace(0, 5000, 20);
% Generate synthetic current data
[lon_grid, lat_grid, depth_grid] = ndgrid(longitudes, latitudes, depths);
U = 0.1 * sin(2 * pi * lon_grid / 360) .* cos(2 * pi * lat_grid / 180) .* exp(-depth_grid / 2000);
V = 0.1 * cos(2 * pi * lon_grid / 360) .* sin(2 * pi * lat_grid / 180) .* exp(-depth_grid / 2000);
% Save the dataset
save('custom_current_data.mat', 'U', 'V', 'longitudes', 'latitudes', 'depths');
Code for plotting the current section
% Load the dataset
load('custom_current_data.mat'); % Replace with your actual data file
% Define the target latitude
target_lat = 30;
% Find the index of the closest latitude
[~, lat_idx] = min(abs(latitudes - target_lat));
% Extract the current data at the given latitude
U_section = squeeze(U(:, lat_idx, :));
V_section = squeeze(V(:, lat_idx, :));
% current magnitude
current_magnitude = sqrt(U_section.^2 + V_section.^2);
% Plot the section
figure;
pcolor(longitudes, depths, current_magnitude');
shading interp;
colorbar;
xlabel('Longitude');
ylabel('Depth');
title(['Current Magnitude at Latitude ', num2str(target_lat)]);
set(gca, 'YDir', 'reverse'); % Reverse the Y-axis to have depth increasing downwards
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