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Esri Scotland Conf 2016 Network Rail
Network Rail manages over 190,000 earthwork assets across the UK's 16,000 route km of track. Traditionally, earthwork inspections cost between £50-£120 per five chain length and were conducted on around 55,000 sites. However, the document describes how GIS analysis of aerial imagery and contour data allowed Network Rail to automatically extract geometry data on over 150,000 cross-sections and identify locations of 80% of sites previously marked as "never inspected", removing the need for on-site visits and saving around £1.2 million. The methodology is now being applied nationwide to generate a complete and consistent record of all earthwork assets for the first time.
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Esri Scotland Conf 2016 Network Rail
- 1. //Oct 7, 20161 Stephen Brooks Senior Engineer Safety, Technical & Engineering: Buildings & Civils https://uk.linkedin.com/in/stephenrbrooks Evaluating & managing earthwork assets with GIS* (*without getting my shoes muddy)
- 2. / 16,000 Route Km190,000earthworks55,000 examinations Oct 7, 2016 2 Network Rail earthworks in numbers
- 3. /Oct 7, 20163 National aerial survey overview Ortho FCIROrtho FCIR
- 4. /Oct 7, 20164 Earthwork examinationsEarthwork examinations Earthwork inspections costEarthwork inspections cost between £50 - £120 per fivebetween £50 - £120 per five chain lengthchain length There are 190,000 earthworkThere are 190,000 earthwork assets across the UKassets across the UK
- 5. /Oct 7, 20165 Earthwork examinationsEarthwork examinations Some earthworks are more extremeSome earthworks are more extreme than othersthan others
- 6. /Oct 7, 20166 Earthwork failuresEarthwork failures
- 7. /Oct 7, 20167 Earthwork remediationEarthwork remediation
- 8. /Oct 7, 20168 Earthwork failures: Harbury LandslipEarthwork failures: Harbury Landslip
- 9. /Oct 7, 20169 Harbury – One year laterHarbury – One year later
- 10. /Oct 7, 201610 Exam question Are we confident that we know where all our earthworks are and the associated geometry information is correct?
- 11. /Oct 7, 201611 Principles of methodology – individual cross section
- 12. /Oct 7, 201612 Principles of methodology – identify the centre point
- 13. /Oct 7, 201613 Principles of methodology – adding heights to the points
- 14. /Oct 7, 201614 Principles of methodology – connecting the spot heights
- 15. /Oct 7, 201615 Principles of methodology – identify break points
- 16. /Oct 7, 201616 Principles of methodology – extract the slope info Now repeat this process every 20m along the rail network (That’ll be 800,000 cross sections)
- 17. /Oct 7, 201617 Applying the methodology – Never Inspected In September 2015 we had 36,000 sites that were never inspected. By April 2016 we had less than 6,000 80% of the 30,000 records were removed without the need to set foot on track. This involved analysing 150,000 cross sections and over 15m spot heights Manual inspections of these sites would have cost in the region of £1.2m
- 18. /Oct 7, 201618 Multiple cross sections
- 19. /Oct 7, 201619 Multiple cross sections - classified
- 20. /Oct 7, 201620 Multiple cross sections - slopes
- 21. /Oct 7, 201621 Multiple cross sections – filter results
- 22. /Oct 7, 201622 Manual versus automatic geometry extraction
- 23. /Oct 7, 201623 Revising the methodology Cutting (Slope height and angle is calculated along entire length) Cutting >3m Cutting >3m Cutting >3m Embankment <3m ‘flat’ Cutting <3m ‘flat’ ‘flat’ ‘flat’ ‘flat’
- 24. /Oct 7, 201624 Multiple cross sections – filter results
- 25. /Oct 7, 201625 Multiple cross sections – revised methodology
- 26. /Oct 7, 201626 Manual versus automatic geometry extraction
- 27. /Oct 7, 201627 Multiple cross sections – relating back to 5 chain lengths
- 28. /Oct 7, 201628 DTM vs automatic slope extraction
- 29. /Oct 7, 201629 Buffering the slope objects
- 30. /Oct 7, 201630 Buffering the slope objects
- 31. /Oct 7, 201631 Final Outputs The never inspected analysis examined 150,000 cross sections and 15m spot heights. We are currently rolling the methodology out nationally to verify presence of all earthworks regardless of inspection status. This involves: •Interrogating 47,000 raster tiles •More than 800,000 cross sections •Over 81 million spot heights Once finished we will have a complete picture of all NRs earthworks assets, including detailed geometry, measured from a consistent perspective for the first time ever.
- 32. /Oct 7, 201632 5m Contouring – proof of concept
- 33. /Oct 7, 201633 1m Contours – (generated, smoothed, filtered, classified)
- 34. /Oct 7, 201634 50cm Contours
- 35. /Oct 7, 201635 25cm Contours
- 36. /Oct 7, 201636 50cm Contours
- 37. /Oct 7, 201638 Conclusions No one GIS system meets all requirements of such complex analysis •Collaborative use ArcGIS, ArcPro, ArcPy & FME Always develop a robust but flexible methodology Complex analysis requires comprehensive data management
- 38. //Oct 7, 201639 Stephen Brooks Senior Engineer Safety, Technical & Engineering: Buildings & Civils https://uk.linkedin.com/in/stephenrbrooks Thank you
Editor's Notes
- #4 Data available for projects
- #39 Always develop a robust but flexible methodology that: is produced in conjunction with subject matter experts has flexible parameters is scalable balances automation with manual input produces output using language that SMEs understand you can track progress is well documented Complex analysis requires comprehensive data management that is: systematic & logical accessible to others well documented