How to detect targets in this map?

function [ im ] = rdmap_shs( fname )

figure()
x=csvread('132030_rdmap.csv');
ts=regexp('132030_rdmap.csv','\d*','match');
im=image(x);
colormap jet(90)
figname=strcat(erase('132030_rdmap.csv','.csv'),'.fig');
savefig(figname)


end

The code above is what we used in order to produce this map using a csvfile. How do you detect the targets in this map? Do we plot it? The color red is supposed to be a ship and we will detect that using a code. I don't know where to start based from what I search on the web. Also, could this be applicable in image processing? If you can help us, it would be very helpful. Thank you!

[KSSV]

Hummh.....seem slike this is some (HF) radar data....and the plot is spectral plot. YOu may refer published articles on that.

https://ieeexplore.ieee.org/document/7587385

[John Mar Armocilla]

Thank you for answering!

Also, if anyone can give a code as a guide in how to do this would be helpful.