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The methodology was trialed on a 36” diameter, 45 km pipeline in the UK. PiPe Centerline Following completion of the internal inspection the IMU data was processed to produce an accurate pipe centerline. The output from the processing is a spreadsheet containing a series of X, Y and Z coordinates, Figure 1. Points can subsequently be imported into a geographic information system (GIS) and used to create a pipe centerline polyline feature. ground elevation data There were two sources of ground elevation data used within this trial, the Environment Agency (EA) LiDAR and Ordnance Survey Terrain 5 data. The EA [6] offer LiDAR data with a spatial resolution of between 25 cm and 2 m. It is currently stated by the EA that accurate elevation data is available for over 75% of England. The absolute height error is quoted to be less than ±15 cm. This is the root mean square (RMS) error. The Ordnance Survey (OS) Terrain 5 data [7] has a quoted height error of ±1.5 m. This is the RMS error for urban and major communication routes. For rural and mountain and moorland areas the error is higher at ±2.5 m. T