Drystone walls as plans / drawings
Drawing up a plan of a dry stone wall for documentation, inventory, project planning, quality assurance and dimensioning. The example shown was created with the CAD software "Sketchup".
The following example shows the steps required to create such a plan. In the finished plan, the wall surface with individual stones is visible. This makes it possible to compare the views of the wall before and after renovation, and the location of the long through stones can also be documented.
Download the example plan as a PDF:
Capture the three-dimensional structure of the wall using a tachymeter, photogrammetry or GPS data. With the help of these data, the wall can be represented spatially and dimensionally correct.
This representation can be used to identify areas, record the condition and the need for renovation.
In order to have an overview of the entire wall surface, it is advantageous to flatten the 3d representation as a 2d surface. For this purpose, the three-dimensional data is displayed as a surface. The measures (areas, distances) remain unchanged. For further processing, the 2d drawing is divided into sections of 2m width.
A measuring tape is laid out in the field in front of the wall. A picture of the wall surface is taken in sections of 2m.
Example of a single image. The position of the starting and ending point of the 2m is marked for clarification. A vertically placed metre can also be photographed as a scale.
As a check and supplement, the heights of the dry stone wall at the beginning and end of the 2m sections can be noted.
The single image is now inserted into the plan as a texture and placed correctly in terms of scale. The markings for the start and end points of the 2m section and the vertically positioned metre help .
With the described procedure, plans can be made before and after a renovation. It is possible to document the location of the long through stones and to show the rebuilt area on the plan.