Monument type
Outbuilding of a villa rustica
 

Survey data
Area investigated: 900 m2
Resolutions:    4 MP/m2 (a = 0,5 m)

Array configuration: Twin-probe
Measuring instruments: Lippmann 4point light MC
Imaging software: SURFER (Golden Software)
Survey period: 11. 2016

Comments
If the alignment of the survey grid does not match the orientation of the archaeological structure,  the interpretation of the image becomes more difficult.

A. When linear structures (e.g. wall foundations) and the survey grid do not have the same horizontal or vertical orientation they are depicted with a regularly repeated offset in their course and are not perceived by the viewer as straight lines. Particularly in the case of small survey areas that do not capture the entire object but only sections of it, this leads to a significantly poorer recognizability and greater uncertainty in the interpretation.

B. One way to make the staggered lines easier recognizable is to interpolate the measurement image. However, it must always be remembered that the result, as with filtering, no longer reflects the actual individual values ​​of the measurement and becomes blurred.

C. Another method of subsequently achieving a correspondence between the grid and the orientation of the structure is to use an image processing program. Here, the grid with all measuring points is subsequently aligned in the direction of the archaeological orientaton. Here small areas at the edges are lost.

In addition, the distance from the viewer and the size of the image play a very important role in the perception of the structures. A large distance to the image or a corresponding reduction of the image size show the same effect as interpolation.