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Esri Scotland Conf 2016 Network Rail

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Esri UK
Esri UK

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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//Oct 7, 2016 1 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)
/ 16,000 Route Km190,000 earthworks55,000 examinations Oct 7, 2016 2 Network Rail earthworks in numbers
/Oct 7, 2016 3 National aerial survey overview Ortho FCIROrtho FCIR
/Oct 7, 2016 4 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
/Oct 7, 2016 5 Earthwork examinationsEarthwork examinations Some earthworks are more extremeSome earthworks are more extreme than othersthan others
/Oct 7, 2016 6 Earthwork failuresEarthwork failures
/Oct 7, 2016 7 Earthwork remediationEarthwork remediation
/Oct 7, 2016 8 Earthwork failures: Harbury LandslipEarthwork failures: Harbury Landslip
/Oct 7, 2016 9 Harbury – One year laterHarbury – One year later
/Oct 7, 2016 10 Exam question Are we confident that we know where all our earthworks are and the associated geometry information is correct?
/Oct 7, 2016 11 Principles of methodology – individual cross section
/Oct 7, 2016 12 Principles of methodology – identify the centre point
/Oct 7, 2016 13 Principles of methodology – adding heights to the points
/Oct 7, 2016 14 Principles of methodology – connecting the spot heights
/Oct 7, 2016 15 Principles of methodology – identify break points
/Oct 7, 2016 16 Principles of methodology – extract the slope info Now repeat this process every 20m along the rail network (That’ll be 800,000 cross sections)
/Oct 7, 2016 17 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
/Oct 7, 2016 18 Multiple cross sections
/Oct 7, 2016 19 Multiple cross sections - classified
/Oct 7, 2016 20 Multiple cross sections - slopes
/Oct 7, 2016 21 Multiple cross sections – filter results
/Oct 7, 2016 22 Manual versus automatic geometry extraction
/Oct 7, 2016 23 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’
/Oct 7, 2016 24 Multiple cross sections – filter results
/Oct 7, 2016 25 Multiple cross sections – revised methodology
/Oct 7, 2016 26 Manual versus automatic geometry extraction
/Oct 7, 2016 27 Multiple cross sections – relating back to 5 chain lengths
/Oct 7, 2016 28 DTM vs automatic slope extraction
/Oct 7, 2016 29 Buffering the slope objects
/Oct 7, 2016 30 Buffering the slope objects
/Oct 7, 2016 31 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.
/Oct 7, 2016 32 5m Contouring – proof of concept
/Oct 7, 2016 33 1m Contours – (generated, smoothed, filtered, classified)
/Oct 7, 2016 34 50cm Contours
/Oct 7, 2016 35 25cm Contours
/Oct 7, 2016 36 50cm Contours
/Oct 7, 2016 38 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
//Oct 7, 2016 39 Stephen Brooks Senior Engineer Safety, Technical & Engineering: Buildings & Civils https://uk.linkedin.com/in/stephenrbrooks Thank you

More Related Content

Esri Scotland Conf 2016 Network Rail

  • 1. //Oct 7, 2016 1 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 Km190,000 earthworks55,000 examinations Oct 7, 2016 2 Network Rail earthworks in numbers
  • 3. /Oct 7, 2016 3 National aerial survey overview Ortho FCIROrtho FCIR
  • 4. /Oct 7, 2016 4 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, 2016 5 Earthwork examinationsEarthwork examinations Some earthworks are more extremeSome earthworks are more extreme than othersthan others
  • 6. /Oct 7, 2016 6 Earthwork failuresEarthwork failures
  • 7. /Oct 7, 2016 7 Earthwork remediationEarthwork remediation
  • 8. /Oct 7, 2016 8 Earthwork failures: Harbury LandslipEarthwork failures: Harbury Landslip
  • 9. /Oct 7, 2016 9 Harbury – One year laterHarbury – One year later
  • 10. /Oct 7, 2016 10 Exam question Are we confident that we know where all our earthworks are and the associated geometry information is correct?
  • 11. /Oct 7, 2016 11 Principles of methodology – individual cross section
  • 12. /Oct 7, 2016 12 Principles of methodology – identify the centre point
  • 13. /Oct 7, 2016 13 Principles of methodology – adding heights to the points
  • 14. /Oct 7, 2016 14 Principles of methodology – connecting the spot heights
  • 15. /Oct 7, 2016 15 Principles of methodology – identify break points
  • 16. /Oct 7, 2016 16 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, 2016 17 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, 2016 18 Multiple cross sections
  • 19. /Oct 7, 2016 19 Multiple cross sections - classified
  • 20. /Oct 7, 2016 20 Multiple cross sections - slopes
  • 21. /Oct 7, 2016 21 Multiple cross sections – filter results
  • 22. /Oct 7, 2016 22 Manual versus automatic geometry extraction
  • 23. /Oct 7, 2016 23 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, 2016 24 Multiple cross sections – filter results
  • 25. /Oct 7, 2016 25 Multiple cross sections – revised methodology
  • 26. /Oct 7, 2016 26 Manual versus automatic geometry extraction
  • 27. /Oct 7, 2016 27 Multiple cross sections – relating back to 5 chain lengths
  • 28. /Oct 7, 2016 28 DTM vs automatic slope extraction
  • 29. /Oct 7, 2016 29 Buffering the slope objects
  • 30. /Oct 7, 2016 30 Buffering the slope objects
  • 31. /Oct 7, 2016 31 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, 2016 32 5m Contouring – proof of concept
  • 33. /Oct 7, 2016 33 1m Contours – (generated, smoothed, filtered, classified)
  • 34. /Oct 7, 2016 34 50cm Contours
  • 35. /Oct 7, 2016 35 25cm Contours
  • 36. /Oct 7, 2016 36 50cm Contours
  • 37. /Oct 7, 2016 38 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, 2016 39 Stephen Brooks Senior Engineer Safety, Technical & Engineering: Buildings & Civils https://uk.linkedin.com/in/stephenrbrooks Thank you

Editor's Notes

  1. Data available for projects
  2. 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 &amp; logical accessible to others well documented