better documentation for raster based terrain analysis plugin

[qgib]

Author Name: Paolo Cavallini (@pcav)
Original Redmine Issue: 2668

Redmine category:documentation_and_help

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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).

[qgib]

Author Name: Paolo Cavallini (@pcav)

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I think this should be added to the 1.5 man

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from Version 1.7.0 to Version 1.7.4

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• fixed_version_id was changed from Version 1.7.4 to Version 2.0.0

[qgib]

Author Name: Pirmin Kalberer (Pirmin Kalberer)

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• fixed_version_id was changed from Version 2.0.0 to Future Release - Nice to have

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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

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• pull_request_patch_supplied was configured as 0
• status_id was changed from Open to Closed