An Urban Centre is defined as: all cells with a local population density of at least 1,500 people/km2 or with a local built-up area share of at least 0.50, and clustered in a 4-connectivity object of at least 50,000 people or all cells resulting from 3x3 median filtering or by gap filling < 15 km2 (median filtering and gap filling applied to cluster of cells that met the previous logics).
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