Abstract High definition ground penetrating radar (HD-GPR) is defined as a GPR survey for archaeological prospection with a spatial grid smaller than or equal to 0.25 x 0.05 m. A comparison between a usual GPR survey with 0.5 m line distance and a HD-GPR survey is demonstrated with a large scale GPR survey at Flavia Solva (Styria, Austria). The Roman town Flavia Solva was founded in the early 1st century AD in the Roman province of Noricum and appears to have been destroyed during the Marcomanni Wars in the late 2nd century AD. The municipal area of the ancient town is located at the western bank of the river Mur and shows an extent of some 39 ha, partially destroyed by the modern town, roads and industrial zones. The use of HD-GPR explicitly enhances the quality of depth slices compared to a usual GPS survey. Therefore HD-GPR surveys will become a standard for archaeological prospection in Austria.


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