Christian Mayer writes:

 > Can''t we use the land use data that we've got to calculate an automatic 
 > smoothing factor.
 > I.e. when we know that we've got elevation data from a town we do much 
 > smoothing. And when we've got paddocks we hardly do any smoothing.

You'd end up smoothing out the hills as well as the buildings in San
Francisco.  Ditto for the hills in (mostly built-up) northern NJ, or
Rome, for that matter.


All the best,


David

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