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Slides used in a webinar on Roam, a mapping service within Digimap's Ordnance Survey Collection. Service is for UK Further and Higher Education.

Slides used in a webinar on Roam, a mapping service within Digimap's Ordnance Survey Collection. Service is for UK Further and Higher Education.

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  • Two types of map data; vector and raster. Raster map data is pixellated, each pixel or cell in the grid contains a value. Some examples of raster maps are scanned maps, digital aerial photographs, satellite images, digital pictures. What makes these map data is the georeferencing, the fact that geographic coordinates of the location have been added to the scanned maps or images.
    Vector map data is more powerful for carrying out data analysis, as it stores data on individual map features. Remember in Roam, when you selected which features you wanted to display? Those maps were vector maps. Where you couldn’t select map features, they were raster maps.


  • 1. Digimap: Making the most of Roam Guy McGarva – Geo User Support Ian Holmes – Geo User Support Vivienne Carr – User Support
  • 2. Digimap’s Ordnance Survey Collection View, annotate and print OS maps
  • 3. Roam Save within Digimap, Print A4-A0 Map Content, Map Information Search, Map tools, Overlays, Basemaps Zoom in/out, 14 fixed scale map views of different OS maps
  • 4. Content • Map 1 Helvellyn – Search, navigate, select map features, add hillshading • Map 2 Archaeological dig site – Change basemap, add polygon & label, save, print • Map 3 Carlisle Flood Warning areas – Import your own map data Digimap Training Workshops
  • 5. Map 1 – Helvellyn • Place name search • Zoom out • Map Content: only want to display water and land features • Overlays – add hillshading
  • 6. Search • Can pan/zoom to your location, or use Search • Place name/ full postcode • Advanced Search offers British National Grid reference search • Coming soon: postcode districts e.g. EH9, street names
  • 7. Place name Gazetteer • Place name search uses the OS 1: 50000 Scale Gazetteer • Same database that is used on the Landranger Maps
  • 8. Zoom in/out • Map centred on Helvellyn • Now I can zoom in/out and pan around Digimap Training Workshops
  • 9. Navigation • Zoom in/out – Click on any notch on the scale bar – Double click to zoom in – Scroll wheel on mouse • Pan – Click and drag the map – Click on NSEW on the compass • Full extent / Previous / Next views
  • 10. Zoomed out to Metropolitan View
  • 11. Map Content • On this map, we are only displaying land and water features • Removed roads, boundaries, tourist features etc
  • 12. Map Content • Feature selection available in 8 of Roam’s 14 views • When unavailable, you will see the message ‘View has no layer selection’ • Unavailable when you are viewing a raster map
  • 13. Raster v Vector map data • Raster map data is a matrix of cells (or pixels) in a grid: – scanned maps, digital aerial photographs, satellite images, digital pictures. – geo-referenced, geographic coordinates of the location added. – useful as background for displaying other data. • Vector map data stores data on individual map features e.g. – Points such as train stations. – Lines such as railway tracks and rivers. – Polygons such as buildings or fields. – We can view, query and analyse vector map data.
  • 14. Hillshading • Will be other overlays available in future
  • 15. Map 2 – Archaeological dig site • Search using a postcode • Zoom in • Add a polygon and a label • Basemaps • Print • Save options
  • 16. Search with postcode
  • 17. Zoom in
  • 18. Basemaps • Basemaps offer maps at same scale, in a different cartographic style • Available in several of Roam’s map views: – – – – Plan, Building and Detailed Street, Neighbourhood District City, Metropolitan • Tip: in Street and Neighbourhood views, switching basemap means you can select features in Map Content…default is raster, basemaps are vector.
  • 19. Annotation tools • Now, we want to add a polygon over the empty site • Easier to select colour and line colour/width before you draw
  • 20. Adding polygon • Click once on each point • Double click at last point to close it
  • 21. Label the polygon • Two options: add standalone label, or add label to the polygon (if you move polygon, label moves with it) • Again, easier to select font options before adding label
  • 22. Add Measurement Label
  • 23. New print interface
  • 24. New print interface • What’s new? – Content and Layout Previews – Legend option
  • 25. Map and legend • If you add the legend option, receive a zip file • Extract the files to see 2 PDF files, map and legend
  • 26. PDF print example
  • 27. Legend extract
  • 28. Save • Save > My Maps saves your map within Digimap – No limit to number of maps you can save – Available as long as your registration remains active • Open > My Maps to retrieve your saved maps Digimap Training Workshops
  • 29. Display annotation in another Roam
  • 30. Display annotations in another Roam
  • 31. Export annotations • Save > Annotations to file, to export annotations • Could then use in GIS/CAD, combine with your own data etc • Formats: – Shapefile can be used in most GIS/CAD software – KML can be displayed in Google Earth – GeoJSON useful for displaying in web maps Digimap Training Workshops
  • 32. Map 3 – Carlisle Flood areas • Import the flood warning area polygons • Change Basemap • Map Content • Label the rivers
  • 33. Import Flood warning areas • Possible to import your own map data to Roam – Various formats can be imported – Only importing the point, line or polygon, not any associated information • We have a Shapefile of polygons of Flood Warning areas – Source of this data is the Environment Agency website
  • 34. Map displaying imported file
  • 35. Zoom out to District View
  • 36. Map Content, Basemaps, Labels for rivers
  • 37. Keep in touch • EDINA Helpdesk – email: edina@ed.ac.uk – telephone: 0131 650 3302 • http://digimap.blogs.edina.ac.uk/ • http://www.facebook.com/EDINADigimap • http://www.youtube.com/user/EDINADigimap • http://twitter.com/edina_digimap