Adding data to geoscatter clicks

Hi! I am using geoscatter to graph the counties in california. I would like the data when I click on the county display the county name and some other information as needed.

Is there a way to do this?

warning off
states = readgeotable('usastatehi.shp'); % 
counties = shaperead('cb_2018_us_county_500k.shx'); %county shape file from cencus.gov

row = states.Name == 'California';
california = states(row,:);

% Extract the polygons in the .shp file
struct2poly = @(s) polyshape(s.X, s.Y);

p = arrayfun(struct2poly, states);
p2 = arrayfun(struct2poly, counties);

s = figure; hold on

geoshow(california)
plot(p)
plot(p2)

Answer 1

[Samya]

Hi! To display additional information when clicking on a county in California, you can use the `datacursormode` function in MATLAB. Here's an example of how you can modify your code to achieve this:

% Load necessary shapefiles
states = readgeotable('usastatehi.shp');
counties = shaperead('cb_2018_us_county_500k.shx');

% Filter California state
row = states.Name == 'California';
california = states(row,:);

% Extract the polygons in the .shp file
struct2poly = @(s) polyshape(s.X, s.Y);
p = arrayfun(struct2poly, states);
p2 = arrayfun(struct2poly, counties);

% Plot the map
s = figure;
hold on
geoshow(california);
plot(p);
plot(p2);

% Enable data cursor mode
dcm_obj = datacursormode(s);
set(dcm_obj, 'UpdateFcn', @myUpdateFcn); % Set custom update function

Next, define the custom update function `myUpdateFcn` that will display the county name and other desired information when a county is clicked:

function txt = myUpdateFcn(~, event_obj)
    % Get the clicked data point
    pos = event_obj.Position;
    
    % Find the corresponding county
    county = counties(inpolygon(pos(1), pos(2), [counties.X], [counties.Y]));
    
    % Extract desired information from the county structure
    countyName = county.NAME; % Replace 'NAME' with the actual field name in the shapefile
    
    % Construct the text to display
    txt = {['County: ', countyName]};
end

Hope this helps!