The aeroradiometric exercise ARM07 was a joint project of the measurement teams of France, Germany and Switzerland. The measurement flights of the exercise ARM07 were performed between 27^th and 31^st of August 2007 under the direction of G. Scharding of the National Emergency Operations Centre (NAZ) and coordination by the Expert Group for Aeroradiometrics (FAR).
According to the alternating schedule of the annual ARM exercises, the environs of the nuclear power plants Mühleberg (KKM) and Gösgen (KKG) were surveyed. The measurements showed similar results to those obtained in former years. The results from the three teams agree well.
The region of Basel, where the borders of Germany, France and Switzerland meet, was chosen for a composite aeroradiometric mapping. It was shown that the data measured by each team in adjacent areas could be uniformly processed and integrated within hours into joint radiological maps of the complete region. The methods for data aquisition, data processing and integration are described.