I have an image and some lat long points on that particular image. I need to visualize which block of the image has the most number of points and I need to use a png image as the xy plane of my 3d histogram.

I used hist3(lat,lon) to generate a 3D histogram. I would like to use the png image as the xy plane. lat and long are vectors containing latitudes and longitudes points.

I need my output to be something like this image but instead of a colored grid, I need my png image to be there.

[Image Analyst]

I think it would make no sense and would be very confusing to plot an image underneath the histogram. People would naturally think that it would be like a surface plot where the brightness at a particular (x,y) location somehow corresponds to the histogram bar height at that same (x,y) location, and of course it doesn't. I'd advise against it.

Such a visualization would NOT tell you "which block of the image has the most number of points". Indeed, the histogram is made up of pixels all over your image. There is no guarantee that the pixels in the highest bar come from a particular block (location) in the image.

[Aswathnarayan Radhakrishnan]

I have georegistered the image by using these commands:

imdata = imread('VIS.png');
[nr,nc] = size(imdata);
lonAx = linspace(-84.1010600000000039,-84.0783799999999957,nc);
latAx = linspace(39.7945199999999986,39.7789500000000018,nr);
cla,imagesc(lonAx,latAx,imdata),colormap(gray)

So the regular hist3 command exactly displays the highest bar over the region where there are the most number of points. So it makes sense to overlay it on top of the image. So is it possible to do that?

[Image Analyst]

No, I don't believe it does. Please attach vis.png and include your code where you took the histogram, like where you called histcounts() or histogram() or histogram2() or the old hist3(). If you called histogram2() or hist3(), then say what the two features you used were. Note that a simple surface plot or bar chart, where image intensity is mapped to a height above a surface, is NOT a histogram. A histogram is a plot of the frequency of intensity values, not the intensity values themselves.