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3.3.2 Curvature
Solving the LS equation with a velocity field that is proportional to the curvature can be used for smoothing as will be demonstrated in Section 4.5. For an arbitrary point
the (mean) curvature of the corresponding LS is defined as

(3.24) 
At grid points
the mean curvature can be approximated by [110]

(3.25) 
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Up: 3.3 Approximations to Geometric
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Otmar Ertl: Numerical Methods for Topography Simulation