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This icon takes data from a GRIB source and performs a variety of operations on it, including spectral to grid conversion, regridding using a large variety of powerful and flexible interpolation techniques, nabla operators and special consideration of wind fields.

The macro/python language equivalent is regrid(). The listed parameters can all be supplied as named parameters with the spaces replaced by underscores, e.g. nearest_method='sorted_sample'.


The Regrid Editor

Data input parameters

Input data may be specified either by giving a path in the Source parameter or by giving a GRIB-based data object in the Data parameter. Note that you should specify either Source or Data, not both.

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Drop a MARS Retrieval or a GRIB file icon inside this icon field. In Python or Macro, supply a Fieldset object.

Output

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grid definition parameters

Grid Definition Mode

Select a method for specifying the output grid.

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Rotation is specified by selecting a new coordinate for the South pole. In Python or Macro, enter [lat, lon]; in the GUI, enter lat/lon or use the coordinate assist button to graphically select the point.

Output Lambert grid definition parameters


These parameters are available if Grid Definition Mode is set to Lambert Conformal or Lambert Azimuthal Equal Area. The names follow the naming convention in the descriptions of these projections here:

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Latin 1 In Degrees

Latin 2 In Degrees

Nx

Ny

Spectral to grid definition parameters

If the input files are spectral, the following parameters are used to fine-tune the conversion to grid points.

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Describes the intermediate grid to which the transform is performed. For more details, see intgrid - keyword in MARS/Dissemination request. Possible values are Automatic , None , Source  or the name of the desired intermediate grid.

Extra processing parameters

Frame

Q: Should this only be available if Area is specified?

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QQQ. Possible values are On and Off.

Interpolation methods and parameters

Interpolation

Specifies the type of interpolation to be used on the fields. The default is Automatic, which selects either Linear or Nearest Neighbour based on an internal table of known parameters. If the parameter is unknown, the default will be Linear. The possible interpolation methods are:

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Only available if Non Linear is Simulated Missing Value. QQQ (description)

Land-sea mask parameters

Distance Weighting With LSM

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LSM Value Threshold Output

QQQ.

Output GRIB parameters

Accuracy

Provide the desired number of bits per value for the output fields. If left empty, this will take the value from the input fields. Note that if Packing  is set to ieee, then the only valid values for this parameter are 32 and 64.

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