End-Member Modelling Analysis (EMMA) for grain-size distribution data from coral island beaches

This record provides the EMMA model and associated code used to analyze grain-size distribution data from the southern and northern beaches of North Island, Xisha Islands, South China Sea. The code implements end-member modelling based on non-negative matrix factorization and can be used for end-member identification, sample-weight estimation, end-member statistical characterization, spatial-gradient analysis, and comparison between original and reconstructed distributions. This model, together with the associated grain-size dataset, supports the reproducibility and methodological transparency of the study entitled “Cross-shore grain-size distribution and sediment transport on different beaches of a coral island in the South China Sea”.