Combine contour plot with Histogram

I have two maps that I need to combine and plot in matlab. The first is an elevation map of land. I made a contour plot of the land. I have a second map that displays gas pockets of the land. I need to make a histogram of the gas pockets and combine it with the contour map. I can do each part seperatly but don't know how to combine the two graphs.

Answer 1

[Image Analyst]

I don't know how you would either. All spatial information is lost when you make a histogram from the elevation image, so how could the histogram be on the same image as the elevation image and make sense? Why do you think that you need to combine these? I suggest you don't combine them unless you mean just to put the elevation as either a surface or image with contour lines, and the histogram in an axes next to it.

[Image Analyst]

By the way, maybe this might be interesting: http://www.mathworks.com/matlabcentral/fileexchange/35452-finddepressions

[Clayton]

It's for a school project and thats what they want. Would it be possible to make a 2d contour color map for elevation. Then plot the histogram on top of it. That way the 3d image would be a histogram of the gas pockets and the coloring of the map would represent elevation.

[Image Analyst]

It doesn't make sense to take an elevation map image or a gas pockets image and make them either a surface with surf(), or an image with imshow() or image() and contour(), and then just plop a histogram (bar chart) on top of it. That would look totally goofy and be meaningless, like a fish on a bicycle. I think you're misunderstanding either what is wanted or what a histogram is. Or maybe I'm not visualizing what you want. I think maybe what you're really after is surfc(). This function will allow you to take an image (the elevation/height/topography image) and plot it in a 2.5D perspective view, and then color the surface height according to a second image you pass in (the gas pocket image) rather than the height of the surface (like surf() would do).

[Clayton]

I got some clarification. THe histogram is essential a bar graph. It would show say you drill down to 500 feet. then a gas pocket is uner that of 200 feet. SO the bar would start at 500 feet and go to 700 feet. I would be dividing my map into a grid and averaging the data in the block.

[Image Analyst]

A bar chart is not always a histogram, so don't call every bar chart a histogram. In fact the bar chart you mention is not a histogram. A histogram is a frequency of occurrence. I'm not even sure how you would represent bars over an image like how you want it. Do you want a bar at every single pixel? That would be too crowded that you wouldn't be able to see anything at all - the thousands or millions of bars would all obscure each other.