What needs to be clarified
Locate specified building elements relative to the documented boundary and explain measurement differences, distinguishing walls, projections and the basemap image.
Materials to prepare
- Current boundary-coordinate extract and original survey records
- Building technical plan and extension information
- Survey access and the original map file with metadata
What to compare
Check coordinate systems, data origin and accuracy, then survey accessible building elements and the fence using established control. Plot the wall, roof overhang, fence and documented boundary separately. Calculate distances for explicitly identified elements with an accuracy assessment; interpret the basemap with its resolution and possible displacement in mind.
Possible outcome of the analysis
A coordinate plan and distance table may identify measured elements and accuracy, explaining differences between screen measurements, fence measurements and the survey.
Limits of the conclusions
An imaged roof edge need not coincide with the wall. Technical distances alone do not determine land rights or the lawfulness of building placement.