How to merge a pie chart with a map

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Hongyun 2024-7-28，8:55

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https://ww2.mathworks.cn/matlabcentral/answers/2140831-how-to-merge-a-pie-chart-with-a-map

编辑： dpb 2024-8-4，15:08

How to merge a pie chart with a map using MATLAB Mapping Toolbox? Just like this one.

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Umar 2024-7-29，4:46

Hi @Hongyun,

@dpb and @Walter have many years of experience and they are one of the best technical experts in Matlab. They have given me best tips to resolve problems and helped others when someone gets stuck in the program. You can learn a lot from their tips. However, to answer your question about merging a pie chart with a map in MATLAB using the Mapping Toolbox, I can provide you guidance. First, create a geographic axes by start creating a geographic axes using the geoplot function. This will serve as the base map for your visualization.

figure

ax = geoaxes;

geoplot(ax, 'your_map.shp') % Example map data

Then, add pie chart data by defining the data for the pie chart that you want to overlay on the map. You can use the pie function to create the pie chart.

data = [30 20 15 35]; % Example data for the pie chart

labels = {'A', 'B', 'C', 'D'}; % Example labels for the pie chart

pie(ax, data, labels)

To position the pie chart correctly on the map, you can adjust the Position property of the pie chart. This property specifies the location and size of the pie chart within the axes.

ax.Position = [0.1 0.1 0.6 0.6]; % Adjust the position of the pie chart within the axes

Now time to customize the appearance of the pie chart by changing properties such as colors, labels, and explode slices if needed.

colormap(ax, jet) % Change the colormap of the pie chart

Once you have set up the map and pie chart overlay, you can finalize any additional customization and display the combined visualization.

title(ax, 'Map with Pie Chart Overlay') % Add a title to the visualization

So, if you follow these steps, you can effectively merge a pie chart with a map using MATLAB's Mapping Toolbox, creating a visually informative and engaging representation of geographic data with associated proportions. Please let me know if you have any further questions.

Umar 2024-7-30，12:44

Hi @Hongyun ,

To add multiple pie charts to a geographic map in MATLAB, repeat the step to create the geographic map as shown in code snippet example below.

figure

ax = geoaxes;

geoplot(ax, 'your_map.shp') % Example map data

Add pie charts by defining the data and labels for each pie chart you want to overlay on the map by using the pie function to create each pie chart.

data1 = [30 20 15 35]; % Example data for the first pie chart

labels1 = {'A', 'B', 'C', 'D'}; % Example labels for the first pie chart

pie(ax, data1, labels1)

data2 = [25 30 20 25]; % Example data for the second pie chart

labels2 = {'X', 'Y', 'Z', 'W'}; % Example labels for the second pie chart

pie(ax, data2, labels2)

% Add more pie charts as needed

Then, adjust each pie chart positions by adjusting the Position property of each pie chart. This property specifies the location and size of the pie chart within the axes.

ax.Position = [0.1 0.1 0.6 0.6]; % Adjust the position of the first pie chart within the axes

% Adjust positions for other pie charts as necessary

Then, customize the appearance of each pie chart by changing properties such as colors, labels, and exploding slices if needed.

Umar 2024-8-3，20:54

编辑：Umar 2024-8-4，2:28

Hi @Hongyun,

I was quiet for sometime but I would like to speak in defense of @dpb, although his sense of humor sometimes offend people but look at all of us, dealing with all technical issues, family problems even myself I lost everything in my life, went through lot of hardships,at this platform I have seen brilliant group of people including @dpb whom I consider as a brother, helped me through lot of issues, provided guidance and he is very exceptional and has helped lot of engineers, research students, teachers etc, you name it, his motivation excelled me at this platform and @Walter Robertson as well, @Walter goes above and beyond solving people problems even helps us by formatting our code. We need to work together as a team to solve our problems and should not be embarrassed to ask for tips or help even having higher ego. Again, @dpb is a gem in stone whose value should not be depreciated and I would like to thank both @Walter Robertson and @dpb for what they do to help out people at this platform among others such as @DGM, @Torsten, @Image Analyst,@Cyclist, it’s like Avengers Team.

dpb 2024-8-4，13:43

编辑：dpb 2024-8-4，15:08

@Umar, thank you first for your service; secondly for the kind words. I do figure there's no reason for a little jocularity not to tag along with the technical, agreed, and I am a sucker for bad puns and the like...and my preferred technique is to coach/teach rather than provide canned solutions that ime too often are just pasted into the asker's code without any attempt to understand or effort on their part. OTOH, sometimes one just does want to show off MATLAB's facilities when a particularly concise/neat solution is available...vectorization and/or logical indexing and the like that most newcomers find strange and daunting.

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