Hi Jing,
You can use ‘hold on’ after plotting the initial sets of scatter points with ‘geoscatter’ to add next set of points to existing plotted points. Below mentioned code illustrates use of ‘hold on’ :
%Set up latitude and longitude data.
lon = (-170:10:170);
lat1 = 50 * cosd(3*lon);
lat2 = 20 * cosd(3*lon);
%Define data that controls the area of each marker.
A = 101 + 100*(sind(2*lon));
%Define data to control the color of each marker.
C = cosd(4*lon);
%Plotting first set of points
geoscatter(lat1,lon,A,C,'^')
%Using hold to retain plotted points
hold on
%Plotting second set of points
geoscatter(lat2,lon,A,C,'o')
Hope this helps!
