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

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thomaz lascala
thomaz lascala 2016-2-15
评论： thomaz lascala 2016-2-16
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

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回答（1 个）

Walter Roberson
Walter Roberson 2016-2-15
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))
  1 个评论
thomaz lascala
thomaz lascala 2016-2-16
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.

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