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The Plateau de Bure Interferometer (PdBI) was a microwave interferometer that has been upgraded and expanded into what is now the Northern Extended Millimeter Array (NOEMA), on the Plateau de Bure (altitude, 2550 meters) in the French Alps and operated by the Institut de radioastronomie millimétrique (IRAM). PdBI consisted of six 15-meter antennas, that observed with bands at 3, 2, 1.8, and 0.8 mm, and could resolve images to 1 arcsecond. NOEMA added six more 15-meter antennas and extended the maximum baselines. The upgrade began in 2014 adding a seventh dish, completing with the twelfth in 2022.