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Big data in Digimap

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Map Curators Group: Edinburgh presentation by Ian Holmes, EDINA Geosupport team, 15 September 2016

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Big data in Digimap

  1. 1. Big Just Got Bigger! Surprises in managing large map collections Ian Holmes EDINA
  2. 2. EDINA delivers online services Based at Supported by Vision: To be integral to the quality and productivity of research and education, in the UK and beyond.
  3. 3. Geo-Services
  4. 4. Digimap • An online mapping and data delivery service • Originally built to provide access to Ordnance Survey (GB) maps and data - a ‘virtual map library’ • Launched in January 2000 • Content extended to include: – Historic OS maps – British Geological Survey data – Marine maps and data (UKHO via Seazone) – Environment data (Centre for Ecology and Hydrology) – Aerial imagery (Getmapping) • Subscription service with around 65,000 users
  5. 5. Digimap Collections •Ordnance Survey •Geology •Historic •Marine •Environment •Aerial
  6. 6. Accessing the data: online mapping via Roam
  7. 7. Accessing the data: online mapping via Roam • Annotation • Data import/export • Save/open • Printing • Measurement tools • No spatial analysis
  8. 8. Accessing the data: forward use Basket options: • version • format • layers 1: Select area 2: Select data 3: Add to basket
  9. 9. Accessing the data: forward use • Forward use: Data Download • GIS and CAD users • Access raw data in different formats • Previous versions of data
  10. 10. Digimap for Schools
  11. 11. Digimap for Colleges
  12. 12. Aerial Imagery • Recent venture with Getmapping • Highest resolution national (GB) dataset: 25cm • Annual updates
  13. 13. Data currency
  14. 14. Data currency
  15. 15. Mosaic – hard edges
  16. 16. Mosaic – data detail
  17. 17. Mosaic – following features
  18. 18. Challenges • User expectation: now is good • Sharing data across multiple platforms
  19. 19. Moore’s Law • Microchip performance doubles every two years Source: http://www.gotw.ca/publications/concurrency-ddj.htm
  20. 20. Decreasing cost of disk space Source: http://www.mkomo.com/cost-per-gigabyte-update
  21. 21. Aerial imagery in numbers • 243,869 1km tiles • 1.7TB • JPEG format
  22. 22. Challenges: mapping
  23. 23. Challenges: mapping
  24. 24. Challenges: mapping
  25. 25. Challenges: printing
  26. 26. Challenges: downloading
  27. 27. Using the data in GIS • OS MasterMap Building Height Attribute • 25cm aerial imagery • VectorMap Local Raster • OS Terrain 5
  28. 28. Using the data in GIS
  29. 29. OS MasterMap Topography Layer • Most detailed mapping available • Supplied in GML format • Provided in GML, DWG and File Geodatabase formats
  30. 30. Summary • User expectation/performance – caching • Currency • Disk space, backup, redundancy
  31. 31. Any questions?

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