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Ordnance survey

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  • 1. The Ordnance SurveyBritain’s National Mapping Agency OS home page, Oct 26, 2012
  • 2. There are three Ordnance Surveys in the British Isles• Ordnance Survey - Great Britain – www.ordnancesurvey.co.uk• Ordnance Survey - Northern Ireland – www.osni.gov.uk• Ordnance Survey - Ireland – www.osi.ie
  • 3. What does the OS GB do?• Accurate survey of Great Britain• Creation of fundamental digital database of all survey information collected• Publication of digital (computer) maps• Publication of paper maps; now based on digital database• Collection of historical OS mapping
  • 4. The original survey framework Triangulated horizontal survey
  • 5. Ordnance survey datum level and bench marksOS public bench mark OS fundamental bench mark Levelled height survey Newlyn: OS tidal station
  • 6. The National grid• Every feature on an Ordnance survey map is located by use of National Grid references.• These are geometrical coordinates measured from a point to the south west of the Scilly Isles• All OS maps use the national grid to define location
  • 7. North NorthThe National Grid for Great Britain Base map projected using a “Universal transverse mercator” (UTM) projection. Grid laid over projected map. Only the central meridian of each grid points North. Meridians aren’t parallel, so the two national grids are not parallel
  • 8. North NorthThe National Grid for Great Britain Base map projected using a “Universal transverse mercator” (UTM) projection. Grid laid over projected map. Only the central meridian of each grid points North. Meridians aren’t parallel, so the two national grids are not parallel
  • 9. North NorthThe National Grid for Great Britain Base map projected using a “Universal transverse mercator” (UTM) projection. Grid laid over projected map. Only the central meridian of each grid points North. Meridians aren’t parallel, so the two national grids are not parallel
  • 10. National grid reference: measured from False Origin: Harnhill Manor farmhouse Six figure reference (1000m precision): 407200 E N Eight figure reference (100m precision): 40712004 E N Ten figure reference (10m precision): 4071220041 E N
  • 11. National Grid reference measured within local 100kmgrid square (six figure reference here is precise to100m)
  • 12. OS Topographic maps• The OS publishes topographic maps at a range of scales, from 1:1,250 (the largest scale) to 1:1,000,000 (the smallest scale they produce)• They also produce a range of tourist and motorist thematic maps. These are not relevant to this topic.
  • 13. OS topographic largest scale 1:1250Very good detail, small area shown
  • 14. OS topographic large scale 1:10,000 Medium detail, medium area
  • 15. OS topographic small scale 1:25,000 Poor detail, large area
  • 16. OS topographic small scale 1:50,000 Almost no detail, large area
  • 17. OS topographic small scale 1:250,000 No detail, very large area
  • 18. OS topographic small scale 1:625,000 No detail, very large area
  • 19. OS topographic very small scale1:1,000,000 No detail, very large area
  • 20. OS Digital maps: digital maps in two base formats: raster or vectorRaster map: images usedas backdrops
  • 21. OS Digital maps: vector mapsVector map: Features drawn as coordinates(points on a graph) joined by lines
  • 22. OS Digital maps: A complete new range of digital maps waslaunched in 2001 called “MasterMap” which will be the core of digital OS maps Landline and SuperPLan digital maps, being superseded by… Features digitised as graphical features: Lines and dots MasterMap digital maps Features digitised as “topographic identifiers” TOIDS: buildings, property boundaries, roads
  • 23. Historical mapping from the OS • Historical maps can be found as paper maps in libraries, county archives and surveyor’s offices. • Increasingly the OS is digitising its historical collection, which will allow it to be integrated with modern map products
  • 24. Promap the simplest source of OS maps for surveyors• www.promap.co.uk
  • 25. OS on line• All OS products can be bought from local agents. The full range can be seen on their web site which is the best source of information on OS products• Digital maps can be purchased and downloaded online if you have suitable software to view them http://www.ordnancesurvey.co.uk• For educational use, OS maps are available from the Digimap service for all students http://digimap.edina.ac.uk/
  • 26. Digimap (managed by the EDINA service) • See the Gateway page for details of how to access Digimap • You must have an ATHENS username and password • It will take up to 24 hours to be allowed into Digimap for the first time
  • 27. Logging in to Digimap Click the login button
  • 28. Confirm your institution Royal Agricultural College When you revisit the site, you will see the College listed here and can just click on it to continue The first time you login, type Royal Agricultural College here and press continue button
  • 29. Confirm your ATHENS details You must enter your ATHENS details every time you use DIGIMAP Then click Login>>
  • 30. Currently RAC has access only tothe Ordnance Survey Collection
  • 31. Viewing and printing OS maps Use the Roam option to view and print high quality OS maps online Don’t use Carto, it doesn’t work. It is to be replaced
  • 32. Using OS maps in your own GIS Download raw data or Mastermap data to use in your GIS Download boundary data, such as postcodes and constituencies for your own applicaitons