Is it possible to do scatter plot for two raster datasets?

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I would like to do scatterplot for two raster datasets. As I found in matlab help, scatterplot works for vector data. Is it possible to do something similar also for rasters?

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bio lim 2015-7-8

Could you give more information about your datasets?

Karolina 2015-7-10

I am not sure is my question was correct, but I have a raster dataset with X,Y,T values, where T represent some phenomena. For the small part of my data I manually delineated the areas where T is very high, then I exported these data to separate raster. And the rest of data I exported to second raster. Now I would like to compare these raster's to find the value (in T) which will be the threshold for automatic division of the whole dataset. What kind of graph should I use to do this? Simple histogram?

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