October 2013
Beginner to intermediate
364 pages
8h 8m
English
Content preview from Learning Geospatial Analysis with PythonBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating histograms
A histogram shows the statistical frequency of data distribution within a data set. In the case of remote sensing, the data set is an image, the data distribution is the frequency of pixels in the range of 0 to 255, which is the range of 8-byte numbers used to store image information on computers. In an RGB image, color is represented as a 3-digit tuple with (0,0,0) being black, and (255,255,255) being white. We can graph the histogram of an image with the frequency of each value along the y-axis and the range of 255 possible pixel values along the x-axis.
Remember in Chapter 1, Creating the Simplest Possible Python GIS, when we used the Turtle graphics engine included with Python to create a simple GIS? Well we can also use ...
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