By inspecting a map and its link file, it showed that some features have moved to a different position but others haven . Isn all map data positional accuracy improved?
Yes, all map data is inspected to confirm it is currently within the new survey accuracy tolerances. Map data that is outside these tolerances are moved to the more accurate position. Over time, additions and changes to the topography of the area can have been surveyed using a variety of control accuracies. For instance, some buildings may have been surveyed using local control (using surrounding detail as survey reference points) and an adjacent road surveyed at a later date using a high order of control, for example, GPS. Return to menu The link files supplied contain both the coordinate position of points that haven’t moved as well as those that have. Transformation software uses these links but systems deal with the shift on neighbouring links in different ways. Optimising any parameters such as range of effect and control point weighting to provide the best result for your data will reduce these instances, but we do advise inspection of any transformation results before acceptance
