plotting colorcoded points on a map

Hi,

I am trying to plot significant trends in the standard precipitation evaporation index onto a map of Zimbabwe. So far, I am only showing positive and negative trends, but I would like to have a colorcode on each point signifying the magnitude. How do I do that?

 clear all;

SPEI12=dlmread('SPEI12_zimbabwe.txt');
gridZim=load('gridZim.mat');
gridZim=struct2cell(gridZim);
gridZim=gridZim{1};

temp=regexp(gridZim,'\d{1,8}','match');    %here I'm just reading out the gridpoints

for i=1:length(gridZim) 
    gridpoints(:,i)=str2double(temp{i});
    long_lat(i,:)=[gridpoints(1,i)+0.01*gridpoints(2,i) -gridpoints(3,i)-0.01*gridpoints(4,i)];
end
for i=1:length(SPEI12(1,:))
   [taub(i) tau(i) h(i) sig(i) Z(i) S(i) sigma(i) sen(i) n(i) senplot(i) CIlower(i) CIupper(i) D(i) Dall(i) C3] = ktaub([SPEI12(:,i) [1:1345].'], 0.05, 0);  %checking for significant trends with Mann-Kendall and quantifying the trend with Sen's slope
end
worldmap('Zimbabwe'); 
bordersm
hold on

long=long_lat(find(h==1),1); %h==1 signifies a significant trend. I just want to plot the gridpoints with a significant trend
latit=long_lat(find(h==1),2);
sen_s=sen(find(h==1));
for i=1:length(sen_s)
    if sen_s(i)<0
        plotm(latit(i),long(i),'bp')
    end
    if sen_s(i)>0
        plotm(latit(i),long(i),'rp')
    end
end
m=worldmap('Zimbabwe'); 
bordersm
hold on

plotm(long_lat(:,2),long_lat(:,1),sen.') %this is not working

Answer 1

[jonas]

Try this:

scatterm(long_lat(:,2),long_lat(:,1),[],sen_s)

I assume sen_s is the variable you want colorcoded. Adapt the colormap per your preferences.

[Darragh Kenny]

Perfect, thanks!