Color bar range color

%% Location Map

This is my code. i want to create color bar from 0 to 360

and each dot color in my plot will be match to the value from D.

I mean that if dot number 1 as value from D of 180 degrees so the color of the dot will be the colors of 180 from the color bar that should go from 0 to 360.

Hope i explained my problem properly

Thank you!!!

this is the code:

Data.Task_Raw2 = readtable(L);
S = unique(Data.Task_Raw2(:, 1), 'rows', 'stable');
Data.Task_Raw = readmatrix(L2);
lat = unique(Data.Task_Raw(:, 13), "rows", 'stable');
lon = unique(Data.Task_Raw(:, 14), "rows", 'stable');
Data.Task_Raw3 = readmatrix(L3);
mag= Data.Task_Raw3(:, 19),"rows", 'stable';
% Use original lat and lon columns
original_lat = Data.Task_Raw(:, 7);
original_lon = Data.Task_Raw(:, 8);
Data.Task_Raw4 = readtable(L4);
D=Data.Task_Raw4(:, 12);
% Create a table with unique latitudes and corresponding longitudes
unique_data = table(original_lat, original_lon, 'VariableNames', {'Lat', 'Lon'});
% Find unique rows in the order they appear in the original data
unique_data = unique(unique_data, 'rows', 'stable');
% Ensure we have 31 unique values
if size(unique_data, 1) < 31
    % Duplicate values for events 30 and 31
    unique_data = [unique_data; unique_data(21, :); unique_data(end, :)];
end
% Convert the S table column to a cell array of strings
S_cell = table2cell(S);
% Generate 31 different colors for each dot
num_points = size(unique_data, 1);
dot_colors = jet(num_points);
figure(2)
m = [unique_data.Lat unique_data.Lon];
ax = geoaxes;
geobasemap(ax, 'satellite');
hold on;
% Generate distinct colors using the HSV color space
hue_values = linspace(0, 1, num_points);
saturation = 0.8; % You can adjust saturation if needed
value = 0.8; % You can adjust value if needed
dot_colors = hsv2rgb([hue_values' repmat(saturation, num_points, 1) repmat(value, num_points, 1)]);
% Plot the station points with different marker sizes and display station names
scatter_handles = gobjects(num_points, 1);
for i = 1:num_points
    scatter_handles(i) = geoplot(m(i, 1), m(i, 2), 'o', ...
        'MarkerSize', 5, 'MarkerFaceColor', dot_colors(i, :), 'MarkerEdgeColor', 'none', 'DisplayName', sprintf('Event %d:mag %.4f', i, m(i, 1), m(i, 2)));
    
    % Add event number as text annotation next to each point
    text(m(i, 1), m(i, 2), num2str(i), 'Color', 'w', 'FontSize', 10, 'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');
end
% Extract magnitude values from mag vector
mag_values = Data.Task_Raw3(:, 19);
% Plot the station points with different marker sizes and display station names
scatter_handles = gobjects(num_points, 1);
for i = 1:num_points
    % Get magnitude value for current point
    current_mag = mag_values(i);
    
    % Plot the point with marker size based on magnitude value
    scatter_handles(i) = geoplot(m(i, 1), m(i, 2), 'o', ...
        'MarkerSize', current_mag, 'MarkerFaceColor', dot_colors(i, :), 'MarkerEdgeColor', 'none', 'DisplayName', sprintf('Event %d: Lat %.4f, Lon %.4f', i, m(i, 1), m(i, 2)));
    
    % Add event number as text annotation next to each point
    text(m(i, 1), m(i, 2), num2str(i), 'Color', 'w', 'FontSize', 10, 'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');
end
% Create a legend for dot color and event information
legend(ax, scatter_handles,'Numcolumns',2, 'Location', 'southwest');
% Set axis limits
sea_of_galilee_lat = 32.75;
sea_of_galilee_lon = 35.5;
zoom_level = 0.15;
geolimits(ax, [sea_of_galilee_lat - zoom_level, sea_of_galilee_lat + zoom_level], ...
    [sea_of_galilee_lon - zoom_level, sea_of_galilee_lon + zoom_level]);

Answer 1

[Voss]

The easiest way to do that is to use geoscatter, which allows you to specify colors as indices into the colormap. See this line in the geoscatter documentation for specifying the color parameter C:

• Vector — Use different colors for each marker and linearly map values in C to the current colormap. The length of C must equal the length of lat and lon. To change the colormap for the axes, use the colormap function.

Here's a demonstration using random data:

% random data
Data = struct( ...
    'Task_Raw',[NaN(31,6) 32.6+0.3*rand(31,1) 35.35+0.3*rand(31,1) NaN(31,6)], ...
    'Task_Raw3',42*rand(31,19), ...
    'Task_Raw4',array2table(360*rand(31,12)));

% Use original lat and lon columns
original_lat = Data.Task_Raw(:, 7);
original_lon = Data.Task_Raw(:, 8);

D = Data.Task_Raw4{:, 12}

D = 31x1

307.9098 47.9602 3.9848 39.3502 182.2855 158.9368 150.7977 81.1509 317.4943 123.5750

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% Create a table with unique latitudes and corresponding longitudes
unique_data = table(original_lat, original_lon, 'VariableNames', {'Lat', 'Lon'});

% Find unique rows in the order they appear in the original data
unique_data = unique(unique_data, 'rows', 'stable');

% Ensure we have 31 unique values
if size(unique_data, 1) < 31
    % Duplicate values for events 30 and 31
    unique_data = [unique_data; unique_data(21, :); unique_data(end, :)];
end

num_points = size(unique_data, 1);
num_colors = 256;

figure
m = [unique_data.Lat unique_data.Lon];
ax = geoaxes;
geobasemap(ax, 'satellite');
hold on;

dot_colors = flipud(turbo(num_colors));

% Extract magnitude values from mag vector
mag_values = Data.Task_Raw3(:, 19);

% Plot the station points with different marker sizes and display station names
scatter_handles = geoscatter(m(:, 1), m(:, 2), mag_values.^2, D, 'filled', 'o');

% Add event number as text annotation next to each point
text(m(:, 1), m(:, 2), compose('%d',1:num_points), 'Color', 'w', 'FontSize', 10, 'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');

% Set axis limits
sea_of_galilee_lat = 32.75;
sea_of_galilee_lon = 35.5;
zoom_level = 0.15;
geolimits(ax, [sea_of_galilee_lat - zoom_level, sea_of_galilee_lat + zoom_level], ...
    [sea_of_galilee_lon - zoom_level, sea_of_galilee_lon + zoom_level]);

% colorbar/colormap/color-limits
colorbar
colormap(dot_colors)
clim([0 360])

[israel cohen]

Thank you very match!

actually i need that the color bar will be just in 3 colors that will go from 0 to 360 and will change every 30 degrees.

[Voss]

You're welcome!

0 to 360 in increments of 30 would require 12 colors, not 3. Do you want the same 3 colors to repeat 4 times? Please advise.

[israel cohen]

I want that the color bar will go from red to orange to blue in smother transition between the colors in the color bar. And the color bar will remain from 0 to 360

Thank you!!

[Voss]

I have edited the answer to use a turbo colormap, which goes from red to orange to blue, with 256 colors.