Ordnance Survey Ireland maps use the same line symbol for a wall, fence, hedge, bank, ditch and stream. Where many features are represented in close proximity it may not be possible to represent them all at the scale of the mapping and it may not be obvious from the map which feature the line represents.
Even if a correct interpretation of the map can be made, the line on the map may not be the legal boundary. It is the position of the actual feature on the ground, not the position of the line on the map that is important in attempting to trace the position of the boundary.
Accurate analysis of the OSI map can usually only be achieved by taking the map onto the site and comparing it with the features on the ground. This can help decide what has been shown, what has been omitted for the sake of clarity or because the map scale does not allow multiple features in close proximity to be shown.
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