Opened 14 years ago
Closed 14 years ago
#3167 closed bug (wontfix)
calculation of ruggedness
| Reported by: | tsw | Owned by: | nobody |
|---|---|---|---|
| Priority: | major: does not work as expected | Milestone: | Version 1.6.0 |
| Component: | Rasters | Version: | |
| Keywords: | ruggeness | Cc: | |
| Must Fix for Release: | No | Platform: | All |
| Platform Version: | Awaiting user input: | no |
Description
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.
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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.