How to plot a density/heat map over an external image?

Dear All,

I need to plot a density/heat map over an external image. I will import a PNG image of a specif area map, with a determinated x and y axis. The x and y corresponds to the longitude and latitude of my points.

I need something like the image below.

Thank you all, Thomaz

Answer 1

[Walter Roberson]

plot your heat map first (it is easier.) Then

hold on
imh = image(YourImageArray);
uistack(imh, 'bottom');
hold off

Doing it in this order saves you from having to undo the automatic setting of axes YDir to 'reverse' that image() would normally do for you.

Note: you might find that you want to image(flipud(YourImageArray))

[thomaz lascala]

Dear Walter,

How can I plot the heat map? I tried different functions and neither one returned what I want.

My latitudes and longitutes are imported from a csv file, I removed the extras coluns in order to become a 238x2 cell and after it I convert it to a 238x2 double.

My latitudes and longitudes are in decimal degress, the extra imagem that I want to plot over has to be limited to the latitudes and longitudes of the real map in order to keep the right position of each point.