[GRASS-dev] Re: [GRASS-user] Curvature in r.slope.aspect

Glynn Clements glynn at gclements.plus.com
Sun Nov 19 12:54:51 EST 2006

Maciej Sieczka wrote:

> >> I have a very simple question regarding the output of r.slope.aspect.
> >> I know that slope and aspect are the first derivatives of elevation and are
> >> expressed in degrees, while profile and tangential curvatures are the second
> >> derivatives of elevation. What I would like to know is the units in which
> >> curvatures are expressed. 
> >> In other words, what does it mean a curvature of 0.05? 
> > 
> > Curvatures will be in 1/metres, e.g. a curvature of 0.05 corresponds
> > to a radius of curvature of 20m.
> I have added this info to manual. Thanks.
> BTW, I noticed an issue with r.slope aspect - it ignores, by desing,
> the MASK set. Shouldn't it conform and let use the MASK?


Glynn Clements <glynn at gclements.plus.com>

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