World map scatterm legend issue

Hi everyone!

I'm trying to plot a range of location (deposits) on a world map through scatterm.

The size of the circle is proportionnal to 'Tonnage" and the color depends on "Type"

I managed to get the plot I want except that the legend is only showing one entry!

I get the following warning:

Warning: Ignoring extra legend entries.

> In legend>process_inputs (line 566)

In legend>make_legend (line 310)

In legend (line 261)

In Map (line 32)

[num, txt]= xlsread( 'Map.xlsx');
Name=txt(2:end,1);
Country=txt(2:end,2); 
Type=txt(2:end,3);
Lat=num(:,1);
Long=num(:,2);
Tonnage=num(:,3);


worldmap world
geoshow('landareas.shp', 'FaceColor', [0.9    0.9    0.9]);

Area=10+400*rescale(Content);
[Types, ~, idx] = unique(Type);
num_groups = size(Types, 1);
cmap = jet(num_groups);
color=cmap(idx,:);

h=scatterm(Lat,Long,Area,color);
legend(h,Types);

I couldn't find a quick solution. If Iremove the handle "h" then the legend display the lines from the world map.

Any ideas?

Thanks!

Answer 1

[Amy Haskins]

If you don't need a specific projection or additional overlays, I would recommend giving geobubble a try instead (introduced in R2017b). It's made for exactly this type of chart and will construct nice legends for you.

I think the alternative would be to filter your data set by type and generate the scatter plot for each type individually.