salem.Grid.lookup_transform

Grid.lookup_transform(data, grid=None, method=<function mean>, lut=None, return_lut=False)

Performs the forward transformation of gridded data into self.

This method is suitable when the data grid is of higher resolution than self. lookup_transform performs aggregation of data according to a user given rule (e.g. np.mean, len, np.std), applied to all grid points found below a grid point in self.

See also Grid.grid_lookup() and examples in the docs

Parameters:

datandarray

an ndarray of dimensions 2, 3, or 4, the two last ones being y, x.

gridGrid

a Grid instance matching the data

methodfunction, default: np.mean

the aggregation method. Possibilities: np.std, np.median, np.sum, and more. Use len to count the number of grid points!

lutndarray, optional

computing the lookup table can be expensive. If you have several operations to do with the same grid, set lut to an existing table obtained from a previous call to Grid.grid_lookup()

return_lutbool, optional

set to True if you want to return the lookup table for later use. in this case, returns a tuple

Returns:

An aggregated ndarray of the data, in self coordinates.

If return_lut==True, also return the lookup table