[GRASS-user] GRASS raster curvature analysis type

[Markus Neteler]

On Wed, Sep 14, 2016 at 9:20 AM, Markus Metz
<markus.metz.giswork at gmail.com> wrote:
> On Wed, Sep 14, 2016 at 1:07 AM, Djordje Spasic <issworld2000 at yahoo.com> wrote:
>> Dear Mrs. Patrasova, Mr. Metz, Mr. Kudrnovsky, Mr. Neteler,
>>
>> Thank you all for the replies!!
>>
>> @ Mr. Metz:
>> So curvature analysis in GRASS are neither Gaussian nor Mean curvature
>> analysis types? Did I understand that correctly?
>
> You can do both in GRASS. Get the principal curvatures you need with
> one of the previously mentioned modules, then calculate Gaussian (K1 *
> K2) and/or Mean ((K1 + K2) / 2) curvature.

Related FWD from Helena, supporting above:

On Wed, Sep 14, 2016 at 1:08 AM, Helena Mitasova <hmitaso at ncsu.edu> wrote:
> No it is neither gaussian, nor mean. v. surf.rst outputs also mean. But any
> curvature can be computed using the second order derivatives output and map
> algebra. It would be also relatively easy to add mean and gaussian curvature
> to the outputs.
...
>
> Helena