pysteps.nowcasts.extrapolation.forecast¶

pysteps.nowcasts.extrapolation.forecast(precip, velocity, timesteps, extrap_method='semilagrangian', extrap_kwargs=None, measure_time=False)¶

Generate a nowcast by applying a simple advection-based extrapolation to the given precipitation field.

Parameters

precip: array-like: Two-dimensional array of shape (m,n) containing the input precipitation field.
velocity: array-like: Array of shape (2,m,n) containing the x- and y-components of the advection field. The velocities are assumed to represent one time step between the inputs.
timesteps: int or list of floats: Number of time steps to forecast or a list of time steps for which the forecasts are computed (relative to the input time step). The elements of the list are required to be in ascending order.
extrap_method: str, optional: Name of the extrapolation method to use. See the documentation of pysteps.extrapolation.interface.
extrap_kwargs: dict, optional: Optional dictionary that is expanded into keyword arguments for the extrapolation method.
measure_time: bool, optional: If True, measure, print, and return the computation time.

Returns

out: ndarray: Three-dimensional array of shape (num_timesteps, m, n) containing a time series of nowcast precipitation fields. The time series starts from t0 + timestep, where timestep is taken from the advection field velocity. If measure_time is True, the return value is a two-element tuple containing this array and the computation time (seconds).