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Enhancing Ordnance Survey Meridian 2 with FME: A Case Study by Dotted Eyes Ltd

At the FME Worldwide User Conference in Vancouver (Sep 21-22, 2006), David Eagle from Dotted Eyes Ltd shared insights on the production of Ordnance Survey's Meridian 2 using FME technology. Established in 1989, Dotted Eyes is a UK-based authorized reseller and expert in FME solutions. This presentation detailed the methodologies and innovations that ensure high-quality data management and integration from various sources, highlighting the critical quality assurance processes facilitated by FME. Discover how Dotted Eyes successfully transforms complex geographical data into reliable mapping products.

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Enhancing Ordnance Survey Meridian 2 with FME: A Case Study by Dotted Eyes Ltd

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  1. v FME Worldwide User Conference - Vancouver Sep. 21-22, 2006 Production of Ordnance Survey Meridian 2 David Eagle – Consultant / Trainer Dotted Eyes Ltd, UK david.eagle@dottedeyes.com

  2. Who are Dotted Eyes? • Authorized Reseller based in Birmingham, England • Established in 1989; now 28 people • Working with Safe Software for 10 years • UK distributor of ‘all things’ FME! • Stock and sell Safe Software products • FME training – two-day course • Consultancy projects using FME • Support by phone & e-mail (support@dottedeyes.com) • Embed FME Objects into our own software products

  3. Strategic Partnerships • MapInfo • Premier partner • Oracle • Partner specialising in Spatial and Locator applications • Ordnance Survey • Platinum partner; supplier of consultancy and software • Safe Software (FME and SpatialDirect) • Reseller & OEM using FME Objects

  4. What Else Do We Do? • Development and consultancy services in GI • Rich internet applications – ResponseMX • AJAX or Flash for cross-browser compatibility • Java EE n-tier architecture on the server • Developer framework with sample applications • Used in banking, local and central government, emergency services, crime and disorder reduction • www.dottedeyes.com\rmx

  5. What is Meridian 2? • Ordnance Survey vector topography products: • OS MasterMap formerly Land-Line (1:1,250 & 1:2,500) • Meridian 2 (about 1:50,000 or 1:100,000) • Strategi (1:250,000) • Mini-Scale (1:1,000,000) • Digital representation of Great Britain • Road, rail, coast, hydrology, woodland, positioned text • Admin boundaries, developed land use areas (DLUA) • Topologically structured polygons, polylines & points geometry with positioned text features • Supplied as tiles in NTF and GIS / CAD formats

  6. What’s Our Role? • We created the product in the year 2000 • Contributed to discussions about content and form • Final decisions on specification rested with OS • Finished roads data supplied by Ordnance Survey • We’ve produced annual ‘refreshes’ since then • The content is entirely renewed every year • Well accepted by the market, so specification changes are now resisted • Conflation of data from a variety of sources • Strategically the process is a stop-gap measure • Long-term aim is to use automated generalisation • Major challenge, as the factor of scale change is 20x

  7. Derived From: • Several OS products are the source for Meridian 2 OSCAR Route-Manager Roads Meridian 2 Land-Line Railway & stations Boundary-Line County, District, Unitary Strategi DLUA, Woodland, Hydrology, Text LandForm PANORAMA Coastline

  8. OS Hierarchy of Feature Type Positional Quality Important Less Important

  9. The Annual Refresh of Meridian 2 • Compare updated sources againstthe mid-scale database we maintain • Apply changes to meet specification • Quality Assurance on edited data • Build the topological structure of nodes, edges and faces • Write NTF (National Transfer Format) • Convert to MID/MIF (including styling), ESRI Shape and DXF

  10. History • No FME workbench available in 2000 • Semantic mapping files were created • Workflow was imported when workbench became available • Subsequently enhancedand made more efficient • Refined each year with experience

  11. QA with FME • Example rule 1… • Polygon layers must not overlap each other • Edges can snap • FME finds overlaps • Woodland extent is clipped • Coastline overlap is resolved DLUA Woodland Coast

  12. QA with FME • Example rule 2… • New connectivity nodes if new rivers are captured • New nodes introduced where rivers join coast

  13. NTF Preparation • Create link and node network Lake Node.tab Lake Link.tab Lake Seed.tab (Lake Tiled.tab) Lake.tab

  14. NTF to supply formats • Translate from NTF to: • DXF • MID/MIF • ESRI SHAPE • Using TranspOSe • Includes embeded FME technology

  15. Meridian 2 Transformers Hall of Fame • PolygonBuilder to construct features 2. LineOnAreaOverlayer to produce neat lines Input: Tile lines & Lake polygons 1. Tester – Simple yet effective!

  16. Summary • We use FME for format translation, but… • It saves us time and money in the QA routines that it performs on project data • Ordnance Survey customers receive a product of high quality and integrity • Dotted Eyes customers efficiently and quickly manage data from National Mapping Agencies, with FME Objects offering many output formats

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