PBH are currently re-coordinating and carrying out a control validation survey for 17 miles between Preston to Blackpool North Station. The control network is being upgraded from Network Rails 3100 & 3101 standards to Network Rails Northern Programs Survey Strategy. The increased accuracy has been achieved by utilising a combination of GNSS static receivers, Trimble 0.5” total stations and levelling equipment to validate existing GNSS points, traverse the route and check levelling of the route. The resultant work has allowed an upgrade in the existing grid from a traverse closure of 1:50,000 to the new required 1:100,000 traverse closure.
Here are a couple of key projects we are perticularly proud of.