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Topography Smoothing in WPS

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Hello WRF-experts,

I'm conducting experiments in WRF where I modify the topography (e.g., 1/2 the default) in the geo_em files (3 nested domains; finest domain is 1km).

I'm not sure if this approach is correct since geogrid applies smoothing to the topography.

Is there another smoothing option in WRF or utility, that I can use to smoothen the modified topography in the geo_em files?

I'll appreciate any help on this.


Staff member
The smoothing methods that the geogrid program may apply to the terrain field are all defined in the smooth_module.F code in the WPS. The default method that is applied is the "smth-desmth_special" option. If you intend to write a stand-alone program to apply this smoothing, I think the code should be easy enough to port to whatever language you prefer to work in.