Hai to all, i have rainfall systems data for one month(screenshot attached below), with that file how to represent spatial plot per particular latitude and longitude regions

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Mr Thadi 2024-4-16

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回答： TED MOSBY 2024-9-1

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Sam Chak 2024-4-17

Do you happen to have an example of the spatial plot? Displaying the sample and attaching the rain data would be beneficial as it would allow interested users to provide potential solutions based on the provided information.

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Answer 1

TED MOSBY 2024-9-1

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Hi,

To create a spatial plot of rainfall data for specific latitude and longitude regions in MATLAB, you can use the scatter or geoscatter functions. As you haven’t provided with with the data file and other specific details for your plot I will be assuming the column names which you can adjust accordingly and give a generalised approach:

Assuming your data is in a matrix rainfallData of size 1072x5, where:

Column 1: Latitude
Column 2: Longitude
Column 3: Rainfall
Columns 4 and 5: add these according to your requirements

Option 1: Simple 2D Scatter Plot

If you want a straightforward scatter plot without geographic projection:

% Load the data 
% Replace this with your actual data loading method 
% Example: rainfallData = load('your_data_file.mat'); 
% Mock data setup  
latitude = linspace(-90, 90, 1072); 
longitude = linspace(-180, 180, 1072); 
rainfall = rand(1072, 1) * 100; % Random rainfall data 
rainfallData = [latitude', longitude', rainfall]; 
% Define broad latitude and longitude ranges initially 
latRange = [min(latitude), max(latitude)]; % Adjust as needed 
lonRange = [min(longitude), max(longitude)]; % Adjust as needed 
% Filter data for the specified region 
regionMask = (rainfallData(:, 1) >= latRange(1) & rainfallData(:, 1) <= latRange(2)) & ... 
    (rainfallData(:, 2) >= lonRange(1) & rainfallData(:, 2) <= lonRange(2)); 
regionData = rainfallData(regionMask, :); 
% Check if there is data in the specified region 
if isempty(regionData) 
    disp('No data available in the specified region.'); 
else 
    % Create the spatial plot 
    figure; 
    scatter(regionData(:, 2), regionData(:, 1), 50, regionData(:, 3), 'filled'); 
    xlabel('Longitude'); 
    ylabel('Latitude'); 
    title('Rainfall Distribution'); 
    axis([lonRange latRange]); 
    grid on; 
    % Add a color bar to indicate the scale of rainfall 
    colorbar; 
    caxis([min(rainfallData(:, 3)), max(rainfallData(:, 3))]); % Adjust color scale 
    colormap(jet); % Choose a colormap 
    % Optional: Enhance plot with additional features 
    set(gca, 'FontSize', 12); 
end 

Option 2: Geospatial Plot with geoscatter

For a more geospatially accurate representation, use geoscatter:

%................replace with the same option 1 code……………… 
% Check if there is data in the specified region 
if isempty(regionData) 
    disp('No data available in the specified region.'); 
else 
    % Create the geospatial plot 
    figure; 
    geoscatter(regionData(:, 1), regionData(:, 2), 50, regionData(:, 3), 'filled'); 
    geobasemap('streets'); % Set the map background 
    title('Rainfall Distribution'); 
    colorbar; 
    caxis([min(rainfallData(:, 3)), max(rainfallData(:, 3))]); % Adjust color scale 
    colormap(jet); % Choose a colormap 
end 