A method and system for deterministic sea wave profiling and/or prediction. Mixed space-time sampling data of the sea is obtained, where the sampling data is helical in time and space and comprises a plurality of beam waveforms. The sampling data is separated into a plurality of sub-sets of the sampling data, where each sub-set of the sampling data corresponds to a region of the sea. For each sub-set of the sampling data, a sub-set sea model is determined using a subsampled set of wavenumbers. Determining the sub-set sea model is based on the beam waveforms in the corresponding sub-set of the sampling data. The sub-set sea models are up-sampled and then combined to form a complete sea model.