calculation of ruggedness

[qgib]

Author Name: Trevor Wiens (Trevor Wiens)
Original Redmine Issue: 3167

Redmine category:rasters
Assignee: nobody -

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In browsing the code for ruggedness I found something odd.

The formula is missing division by n prior to the execution of sqrt if it is supposed to be standard deviation from the centre pixel.

Since there is no documentation on the formula that was intended, I don't know if this is intentional or a bug.

[qgib]

Author Name: Marco Hugentobler (@mhugent)

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Ruggedness index is calculated according to Riley et al. 1999 (see corrected formula in http://www.fw.msu.edu/~rileysh2/Terrain%20Ruggedness%20Index.pdf). There is no division by the number of pixels, only the root of the squares is taken.

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• resolution was configured as wontfix
• status_id was changed from Open to Closed