National audienceThis contribution tries to explain why morphologists and archaeologists have difficulties to communicate when they collaborate in preventive archaeology. Despite a significant part of aerial survey in morphology, the two approaches use differents concepts. Archaeology can't validate morphology data's because there is no material connection between archaeological trace and morphological boundary. In the same way, the archaeological observation scale can't be generalized at the landscape scale because the study scale must be adjusted to the observed object. There the conditions to build up a new collaboration between archaeologists and morphologists who interests too town and country planning.Cette contribution tente de compr...