Positional Improvement

What is Positional Improvement (PI)?

Land & Property Services (LPS) large-scale mapping has been compiled over a period of many years, with the first surveys being undertaken in the 1830s. Over this period of time, the survey methods used to collect data have continuously evolved as technology has improved, and this has resulted in positional inconsistencies across the data. Where old methods focused on the relative accuracy of the distance measured between two points on a map and the true distance between the same two points; new surveying methods capture the absolute accuracy distance between the position of a point on a large scale map and assess its true position within the reference frame using Global Positioning Systems (GPS).

Update 1st February 2012 - OSNI Largescale 10K sheets 'Locked Out of Database' are currently being positionally improved.

Please note that it will not be possible to update our mapping with real world change until these 'locked out' sheets have been positionally improved and returned to our internal mapping systems.

The sheets 'Next Supply to Contractors' will be positionally improved in the next few months, and obviously, these sheets will also be 'locked out' during this period.

To date, nine (9) 10K sheets have been positionally improved and loaded back into our customer supply databases (Sheets 247 and 248 were positionally improved as part of the pilot project)