Seppe Cassettari: New directions in Mapping Place


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Seppe Cassettari: New directions in Mapping Place

  1. 1. <ul><li>New directions in Mapping Place </li></ul><ul><li>Seppe Cassettari </li></ul><ul><li>The GeoInformation Group </li></ul>© The GeoInformation Group 2009
  2. 2. A new direction? <ul><li>Lesson 1 </li></ul><ul><li>The developments in geospatial technologies in recent years mean that the creation of new and innovative, highly detailed, mapping products is commercially viable. </li></ul>
  3. 3. A new direction? <ul><li>Lesson 2 </li></ul><ul><li>Innovation stimulates progress and opens up new opportunities. </li></ul><ul><li>Innovation leads to greater choice, more flexibility and stimulates new approaches to problem solving. </li></ul>
  4. 4. A new direction - UKMap <ul><li>It was by learning these lessons and understanding their implications that led to the UKMap Programme. </li></ul><ul><li>But it was a long road of consultation, commercial innovation and technical experimentation which led up to that point. </li></ul>
  5. 5. The road leading to UKMap <ul><li>Several technical innovations from the early Cities Revealed imagery data in 1994, through the PI databases. </li></ul><ul><li>The first large scale mapping project in France in 2003 </li></ul><ul><li>Developing innovative production solutions during several mapping programmes in the UK and abroad </li></ul><ul><li>Involving potential users to understand what they wanted and needed </li></ul>
  6. 6. UKMap – Founding Principles <ul><li>The key requirements </li></ul><ul><li>Mapping that is comprehensive, accurate, fit-for-purpose, and readily usable. </li></ul><ul><li>Out of the box, plug and play….. </li></ul><ul><li>All in one package, transparent pricing, simple licensing, the right level of support </li></ul>
  7. 7. UKMap – Founding Principles <ul><li>High level of user input into the design </li></ul><ul><li>Continued contributions for future developments </li></ul><ul><li>Transparency on methodologies, accuracy </li></ul><ul><li>Co-operative approach to maintenance </li></ul><ul><li>The overall goal was to create choice and flexibility </li></ul>
  8. 8. UKMap Product Concept <ul><li>Two product layers </li></ul><ul><ul><li>Topo </li></ul></ul><ul><ul><ul><li>1:1,000 scale vector and point layers </li></ul></ul></ul><ul><ul><li>Thematic </li></ul></ul><ul><ul><ul><li>1:5,000 raster layer </li></ul></ul></ul>
  9. 9. UKMap Topo Product Suite Base Overlay Points Addresses Heights POI Ortho Terrain
  10. 10. Topo - Base <ul><li>Large scale topographic base. </li></ul><ul><li>Polygons only </li></ul><ul><li>Base for all other attributes </li></ul><ul><li>All buildings, roads, rail, water features, including boundaries mapped. </li></ul>
  11. 11. Topo - Overlay <ul><li>Holding all overlapping features </li></ul><ul><li>Trees </li></ul><ul><li>Power lines </li></ul><ul><li>Walkways </li></ul>
  12. 12. Topo - Points <ul><li>Links the attribute tables of UKMap (addresses heights and points of interest) and the polygons of the Base and Overlay layers. </li></ul><ul><li>The points layer also contains a location for some other features like the location of road and feature names. </li></ul>
  13. 13. Topo - Addresses <ul><li>Follows the principles of BS7666 and contains two related tables </li></ul><ul><ul><li>UCC to BLPUs </li></ul></ul><ul><ul><li>BLPUs to Address. </li></ul></ul><ul><li>Recordable address for every publicly accessible building </li></ul><ul><li>Address ranges </li></ul><ul><li>Expanded address table for creation of an address gazetteer. </li></ul>
  14. 14. Topo - Points of Interest <ul><li>Geographic and non geographic features. </li></ul><ul><li>18 categories, e.g. </li></ul><ul><ul><li>Transport facilities, central & local government, community, sports & leisure, retail and regional & local names. </li></ul></ul><ul><li>Supporting information . </li></ul>
  15. 15. Topo - Heights <ul><li>Three height values for every building element </li></ul><ul><ul><li>Base </li></ul></ul><ul><ul><li>Top </li></ul></ul><ul><ul><li>Difference </li></ul></ul><ul><li>Derived from LiDAR or aerial photography. </li></ul>
  16. 16. Topo - Ortho <ul><li>Layer from which UKMap topography is collected </li></ul><ul><li>12.5cm high resolution </li></ul><ul><li>Full colour, </li></ul><ul><li>Ortho rectified </li></ul><ul><li>Controlled to GPS </li></ul><ul><li>Target Accuracy ± 1.0m </li></ul>
  17. 17. Topo - Terrain <ul><li>5m resolution digital terrain model (DTM) </li></ul><ul><li>Derived from either high resolution aerial photography or LiDAR. </li></ul>
  18. 18. Thematic – 5K <ul><li>1:5,000 scale mapping </li></ul><ul><li>Derived directly from the Topo product suite </li></ul><ul><li>Designed for web </li></ul><ul><li>Raster and vector </li></ul>
  19. 19. Unique Classification Code <ul><li>Each polygon has a 30 digit UCC code which includes: </li></ul><ul><ul><li>Land use code, 4 level hierarchy </li></ul></ul><ul><ul><li>FTC code </li></ul></ul><ul><ul><li>Source of data </li></ul></ul><ul><ul><li>Date of last feature edit </li></ul></ul>
  20. 20. Inferred BLPU <ul><li>Inferred Basic Land and Property Units included with UKMap. </li></ul><ul><li>Every polygon associated to a property is associated through the UCC with the main addressable building. </li></ul><ul><li>Creation of BLPU’s now possible within a few clicks. </li></ul>
  21. 21. How did we do it?
  22. 22. In the beginning
  23. 23. Map Digitising <ul><li>From Cities Revealed stereo aerial photos </li></ul><ul><li>By our Indian partners </li></ul><ul><li>Using primarily AutoCAD </li></ul><ul><li>Nominal digitising scale is 1:250 </li></ul>
  24. 24. Accuracy check <ul><li>Checking digitising against independent GPS </li></ul>
  25. 25. Field Data Collection <ul><li>Team of surveyors walking every publicly accessible area. </li></ul><ul><li>Adding data by hand to field sheets </li></ul><ul><li>London is covered by 60,000 field sheets </li></ul>
  26. 26. Fieldwork Key sheet
  27. 27. Compilation <ul><li>All field data transferred into the digitised map base. </li></ul><ul><li>Land use codes added by interpretation of field data and aerial photography </li></ul><ul><li>Using ArcGIS </li></ul>
  28. 28. The Final product <ul><li>Stored in Oracle </li></ul><ul><li>Typically 12,000 polygons per 1 sqkm </li></ul><ul><li>Averaging 1,200 addresses </li></ul><ul><li>37 attribute fields </li></ul><ul><li>Ca 260 Land use codes </li></ul><ul><li>73mb per sqkm </li></ul>Ortho Base Overlay Points Addresses Heights POI Terrain Thematic
  29. 29. Maintenance <ul><li>3 pronged approach: </li></ul><ul><ul><li>3 year re-survey based on new aerial photography </li></ul></ul><ul><ul><li>Annual update of POI information </li></ul></ul><ul><ul><li>Quarterly update mapping change (from change partners) </li></ul></ul><ul><li>Change partners provide information through on-line update system </li></ul>
  30. 30. Change Reporting
  31. 31. New directions in Mapping Place? <ul><li>A new approach to large scale mapping </li></ul>