Drainage data capture and vectorisation

Network Rail Digitisation, Data management, GIS

Home Our work Client projects Drainage data capture and vectorisation

With Network Rail's aspiration to improve its knowledge about drainage assets we were commissioned to capture data form a number of existing sources employing a range of techniques. Network Rail holds a significant amount of relevant historic data, without exaggeration, from envelope based sketches to detailed as-built drawings. The former might include an ELR and mileage, the latter could be a fully georeferenced, attributed AutoCAD drawing.

Approaches for the identification include the development of a suite of tools that allowed ease of navigation by ELR and mileage (based on the national ELR centreline and mileposts, typically at quarter mile intervals) as well as automated positioning routines. These allowed the location of data based on their ELR and mileage and track side. As such data in formats that could not be readily georeferenced could be automatically positioned.

As part of the data capture project the British Rail Drainage Drawings were identified as providing a valuable source of the data. This resulted in some 77,000 assets being digitised from 3,000 files. These included node and link datasets for chambers, man holes, piped, open channel and other such assets; both underground and surface features.

These data were uploaded to Network Rails CV065 Geotechnical Asset Management web site (developed, maintained, supported and hosted by JBA for over 14 years). They were also made accessible on site using GISmo Drainage in order that site inspections could be undertaken to validate asset type, location, and condition and complete a detailed asset inspection.

As an extension, we were commissioned to migrate data from LNW Route, captured using an alternative system, into the GISmo data structure. We subsequently provided these data as a core dataset to the Integrated Drainage programme (IDP) in an Ellipse compatible format and structure. At the time the data captured by GISmo had to be downgraded because it was of a higher quality than Ellipse could accommodate.

For information on this project, contact Stuart Wallace on 01756 699500.