better documentation for raster based terrain analysis plugin

[qissue-bot]

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Author Name: Paolo Cavallini (Paolo Cavallini)
Original Redmine Issue: 2668, https://issues.qgis.org/issues/2668

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The terrain analysis plugin is not well documented in the manual: would it be possible to add a few notes (in particular, the unit of measure used, and the meaning of curvature and rougeddness; also, the aspect map is unclear: is it clock or counterclockwise? In any case, it is different from how it is calculated in GRASS, which is very confusing to me).

[qissue-bot]

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Original Redmine Comment
Author Name: Paolo Cavallini (Paolo Cavallini)
Original Date: 2010-06-11T21:30:00.000Z

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I think this should be added to the 1.5 man

[qissue-bot]

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Original Redmine Comment
Author Name: Alexander Bruy (Alexander Bruy)
Original Date: 2015-03-05T05:18:39.000Z

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Moved to GitHub issues, see qgis/QGIS-Documentation#465