# RC—Reflective Contrast

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This index quantifies the difference in reflectivity between the hills and valleys of the surface topography.
The algorithm separates the surface data into valleys and hills using a parameterized threshold height.
It then calculates the mean reflectivity values for both areas and uses the contrast formula:

<code>contrast = (hill + valley) / (hill − valley)</code>

This provides a measure of how much the reflectivity differs between the elevated and depressed areas of the surface.