Re: rcm2rgrid question

Hi Andrea,

Consider 4 MM grid points [X]. Let + be the grid point being interpolated

                X X
                           +
 
                X X

The doc should be changed ... if 3 of the 4 X values are present, the
the value will be interpolated using inverse distance weighting.

--
The "No extrapolation is performed beyond the range of the input 
coordinates."
means that if the + are outside of the north-south, east-west boundaries 
of the
input grid boundaries, they will be set to missing. No extrapolation.
D
>
> I am using the function rcm2rgrid to interpolate MM5 fields (lambert 
> conformat projection) to a regular lat/lon grid. I am trying to mask 
> out the land points (x = mask(x,land.eq.0,True) to use only ocean 
> values in the interpolation.  The documentation of the rcm2rgrid 
> function says "No extrapolation is performed beyond the range of the 
> input coordinates. missing values are allowed but ignored."  What does 
> this actually mean? That if a lat/lon grid point is not surrounded by 
> 4 rcm points no interpolation will be performed or that the 
> interpolation will be performed with only the non-missing points? BTW, 
> what kind of interpolation is being performed?
>
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