Oblique aerial photographs will permit a planimetrical representation of the archaeological structures they have revealed. The perspective of the ground, through computer use, can be restored speedily and accurately. The software created and perfected by Stephane Laisné using Pascal language, and Basic, is based on a mathematical solution. This technique can be applied to archaeological exploration and also to the photogrammetic survey of excavated sites. The numerical results obtained can be translated into a plan and can reveal the topometrical distribution of structures on the ground before excavation. Accuracy 
of the values obtained depends mainly on the scale of the photograph, on how precise it is, on ground topography, on topometrical data. Two different and concrete examples are given here.