[GRASS-user] slope curvature algorithm - adjust the kernel size

Markus Neteler neteler at osgeo.org
Wed Jun 4 15:28:02 EDT 2008

Hi Bob,

below answers from Helena and Jaro


On Wed, Jun 4, 2008 at 2:27 AM,  <hmitaso at ncsu.edu> wrote:
> Jaro Hofierka wrote:
>> I think r.param.scale is the module that this guy is looking for.
> that is right. In case he is working with the latest lidar data for
> California, I think we have a nice example in the book for r.param.scale
> for the high resolution data showing what neighborhood you need to get
> meaningful curvature maps from lidar-based DEM.
>  If he has the bare earth point cloud available he can get even better
> curvature maps at an appropriate level of detail while keeping the
> resolution high from v.surf.rst (I think we have that described in the
> IEEE paper 2005 and here is an illustration)
> http://skagit.meas.ncsu.edu/~helena/measwork/jockeys/a57tenslpcn.gif
> Helena

On Tue, Jun 3, 2008 at 10:23 PM, Moskovitz, Bob
<Bob.Moskovitz at conservation.ca.gov> wrote:
> Hello list,
> A coworker was asking me if I know of a slope curvature algorithm that lets
> you adjust the kernel size.  Does GRASS have such a program?
> Bob
> Bob Moskovitz
> Seismic Hazard Zonation Project
> California Geological Survey
> http://www.conservation.ca.gov/cgs/shzp

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