# How to plot a Map with 2 dimensional colorbar?

8 views (last 30 days)
sid Chen on 14 Oct 2019
Commented: sid Chen on 15 Oct 2019
Hi, I want to plot like this figure.
My question is how to get colorbar like this one, the shape of the figure( like this map) doesn`t matter( Now it`s a gobal spatial pattern, it could be anything else)
at each point on the map, I have 2 values, mapping to one color in the two dimensional colorbar.

darova on 14 Oct 2019
You can use axes to create new axes and place there an image you want
sid Chen on 14 Oct 2019
It`s my fault that my expression is not clear.
The trouble is how to get 2-D colorbar, I only know how to plot with 1-D colorbar.The position doesn`t bother me.
As mentioned, there is no functionality for a 2d colourbar in Matlab, but you can create your 2d image representing your 2d colourmap easily and just plot it using imagesc on its own axes that you can position wherever you want.

darova on 14 Oct 2019
Here is a way:
clc,clear
n = 100;
I = zeros(n,n,3);
h = linspace(0,1/6,n);
s = linspace(1,0,n/2);
[H,S] = meshgrid(h,s);
I(:,:,1) = [H+0.5; H];
I(:,:,2) = [S; flipud(S)];
I(:,:,3) = [S; flipud(S)]/2+0.5;
I1 = hsv2rgb(I);
imshow(I1)

#### 1 Comment

sid Chen on 15 Oct 2019
Wow, Thanks!
it`s amazing!

Alaster Meehan on 14 Oct 2019
I don't think Matlab has anything that can do this nativly, but I will follow just incase any has a better idea then me.
My thoughts...
Generate an image/matrix that is what you want you color bar to look like. Use the subplot function to plot your image/map and your colorbar image next to each other.
Cheers Alaster

#### 1 Comment

sid Chen on 14 Oct 2019
Still Thanks!
I will be wating for the answer.

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