Boundary Surveys 
These vary from site to site, but typically involve combining newly surveyed data with information from old plans, conveyances and aerial photographs to re-establish the positions of boundaries that have become unclear or have moved over the course of time.  
Boundary drawings may be produced with dimensions and/or grid co-ordinates describing the precise position of the boundary. These drawings are suitable for lodging as registered plans which legally define the boundary and allow its re-establishment should the need arise. Having the co-ordinates of a boundary means it is easy to relocate it even in the absence of physical features.  
Survey information is generally presented on paper or in pdf format. Below is an example of a typical boundary drawing.

Marquis Surveys Limited
Chartered Land Surveyors
Chartered Engineering Surveyors