geocat.comp.rcm2points#

geocat.comp.rcm2points(lat2d, lon2d, fi, lat1d, lon1d, opt=0, msg=None, meta=False)#

Interpolates data on a curvilinear grid (i.e. RCM, WRF, NARR) to an unstructured grid.

Interpolates data on a curvilinear grid, such as those used by the RCM (Regional Climate Model), WRF (Weather Research and Forecasting) and NARR (North American Regional Reanalysis) models/datasets to an unstructured grid. All of these have latitudes that are oriented south-to-north. An inverse distance squared algorithm is used to perform the interpolation. Missing values are allowed and no extrapolation is performed.

Parameters:

  • lat2d (xarray.DataArray, numpy.ndarray) – A two-dimensional array that specifies the latitudes locations of fi. The latitude order must be south-to-north. Because this array is two-dimensional it is not an associated coordinate variable of fi, so it should always be explicitly provided.

  • lon2d (xarray.DataArray, numpy.ndarray) – A two-dimensional array that specifies the longitude locations of fi. The longitude order must be west-to-east. Because this array is two-dimensional it is not an associated coordinate variable of fi, so it should always be explicitly provided.

  • fi (xarray.DataArray, numpy.ndarray) – A multi-dimensional array to be interpolated. The rightmost two dimensions (latitude, longitude) are the dimensions to be interpolated.

  • lat1d (xarray.DataArray, numpy.ndarray) – A one-dimensional array that specifies the latitude coordinates of the output locations.

  • lon1d (xarray.DataArray, numpy.ndarray) – A one-dimensional array that specifies the longitude coordinates of the output locations.

  • opt (numpy.number) – opt=0 or 1 means use an inverse distance weight interpolation. opt=2 means use a bilinear interpolation.

  • msg (numpy.number) – A numpy scalar value that represent a missing value in fi. This argument allows a user to use a missing value scheme other than NaN or masked arrays, similar to what NCL allows.

  • meta (bool) – If set to True and the input array is an Xarray, the metadata from the input array will be copied to the output array; default is False. Warning: This option is not currently supported.

Returns:

fo (xarray.DataArray, numpy.ndarray) – The interpolated grid. A multi-dimensional array of the same size as fi except that the rightmost dimension sizes have been replaced by the number of coordinate pairs (lat1d, lon1d).