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| GUI | Python / Macro | Result |
|---|---|---|
| 1/1 | [1, 1] | A regular lat/lon grid with 1x1 degree point spacing |
| 0.25/0.25 | [0.25, 0.25] | A regular lat/lon grid with 0.25x0.25 degree point spacing |
| O1280 | "O1280" | An octahedral reduced Gaussian grid, octahedral with 1280 latitude lines between the pole and equator |
| N640 | "N640" | An 'original' reduced Gaussian grid, with 640 latitude lines between the pole and equator |
| F400 | "F400" | A regular Gaussian grid, with 400 latitude lines between the pole and equator |
Area
Needs to be checked!
Specifies a geographical area over which to carry out the interpolation, the default being for the whole globe. Enter coordinates (lat/lon) of an area separated by a "/" (North/West/South/East), or in Macro or Python provide a list, e.g. [north, west, south, east]; alternatively, use the assist button to define the area graphically.
Rotation
Needs to be checked!
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.
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Extra processing parameters
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Frame
Q: Should this only be available if Area is specified?
Specifies the width of a frame within a given sub-area. The width of the frame is specified as an integer number of grid points inwards from a given area. See also frame - keyword in MARS/Dissemination request.
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- UV To UV: assumes that the input files come in pairs of U/V. The resulting values will be scaled by the cosine of their latitudes.
- VOD To UV: assumes that the input files come in pairs of vorticity and divergence. The resulting values will be scaled by the cosine of their latitudes.
By default, this module will assume there are no wind fields in the input, and it will not automatically scan for pairs of U/V fields - it is up to the user to know that their input consists of wind fields and to use this setting in order to perform the correct processing.
Nabla
Activates a nabla (differential) operator processing on the fields. Possible functions are:
- Scalar Gradient: QQQ
- Scalar Laplacian: QQQ
- UV Divergence: QQQ
- UV Gradient: QQQ
- UV Vorticity: QQQ
- Off: do not perform any nabla operation
Nabla Poles Missing Values
QQQ. Possible values are On and Off.
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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:
- Linear: QQQ
- Bilinear: QQQ
- Conservative Finite Element: QQQ
- Grid Box Average: QQQ
- Grid Box Maximum: QQQ
- K Nearest Neighbours: QQQ
- Nearest LSM: QQQ
- Nearest Neighbour: QQQ
- Structured Bicubic: QQQ
- Structured Bilinear: QQQ
- Structured Biquasicubic: QQQ
- Automatic: see description above.
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Available for any of the 'nearest' interpolation methods. Possible values are:
- Distance: QQQ
- Distance and nclosest: QQQ
- Distance or nclosest: QQQ
- Nclosest: QQQ
- Nclosest or nearest: QQQ
- Nearest neighbour with lowest index: QQQ
- Sample: QQQ
- Sorted sample: QQQ
Distance Weighting
Only available if Interpolation is K Nearest Neighbours. QQQ QQQ (description)
Possible values are:
- Climate Filter: QQQ
- Gaussian: QQQ
- Inverse Distance Weighting: QQQ
- Inverse Distance Weighting Squared: QQQ
- Nearest Neighbour: QQQ
- No: QQQ
- Shepard: QQQ
- Off: QQQ
Nclosest
Only available if Interpolation is K Nearest Neighbours and Distance Weighting is one of the 'NClosest' methods. This parameter specifies the number of closest points to be considered. Default=4.
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