Digimap Data Access: Key Techniques for ArcGIS Usage

1. Digimap data in ArcGIS Guy McGarva EDINA Geo User Support Ian Holmes

2. Poll What is the one thing you most want to learn today? • What map data is available from Digimap • How do I get the data from Digimap • What data formats should I use in ArcGIS • Tips on using ArcGIS • Other

3. Content • What data is available? • How do I use Data Download to get data for ArcGIS? • What formats should I pick for using in ArcGIS? • How do I load data into ArcGIS? • How do I style my data? • Tips: • Projections • Processing • Resources

4. Digimap Home Page

5. What data is available from Digimap? • Ordnance Survey (OS) – Full range of OS maps and data available including OS MasterMap and OS OpenData • Historic – Detailed historic OS maps from 1843-1990s • Geology – Onshore and offshore geological datasets • Marine – Marine and coastal zone data • Environment – Land cover datasets All data can be used in ArcGIS in one form or another!

6. How do I download map data? • Data Download – download OS and other mapping data for use in ArcGIS • There are similar applications for all other collections

7. Data Download in Other Collections

8. Using Data Download Three steps: • Select area • Choose data • Add to basket - options to change format, version and layers

9. Basket options • Select version, format and layers in the basket. • Options vary between map data products.

10. What formats should I use for ArcGIS? Vector • Shapefile – if available • File Geodatabase –MM Topo and Building Heights • GML (for OS MasterMap and VML) – only if needed Raster • TIFF – for raster • ASC (for DTM)

11. Check format availability • Check the Information boxes. • Every product in Vector Data category available in Shape format. • The most up-to-date contours are also available as Shape.

12. OS MasterMap Topography • Recommend you take File Geodatabase for use in ArcGIS (FGDB). • Alternative: Take GML and convert to Shape or File Geodatabase using tools detailed in Help pages. • Why would I convert GML? - Can select the feature types you import - Can merge several orders together

13. Use Productivity Suite to process GML • Creates a File Geodatabase • Can select Feature Types to process • Can process multiple Chunks and Multiple Orders • Required for ITN to build network dataset

14. Formats and conversion guidance http://digimap.edina.ac.uk/webhelp/os/data_information/data_formats/new_data_translators.htm

15. Download zip file contents • Within each zip file: • Folder for each map product • Contents text file • Citations text file • You must extract the data from the zip file before using the data in ArcGIS: • Either use the Windows ‘built-in’ uncompress option “Extract All” available when you right click on the zip file • Or use software such as 7-Zip or WinZip to extract the data from the zip file.

16. Poll- Where do you get data? What sources do you use to get data for ArcGIS, select all that apply: • Digimap • Built-in EsriBasemaps or Esri Portal • Data.Gov or other open portal • Your own data • Other source

17. Loading data into ArcGIS Use the Add Data button Select Folder Connections to add downloaded data Can also “Drag and Drop” file into ArcMap

18. Adding raster data e.g. 25K Raster - Select multiple files if you want. - Will automatically show files that can be loaded e.g. TIF files, Shapefiles, ASC or File Geodatabase - You might get a warning saying they have missing spatial reference information. - Ignore for now.

19. Adding Shapefiles e.g. VML • Select multiple feature classes • Note there are separate feature classes for points , lines and areas • There are separate feature classes for each tile • Example tile of VML without syling

20. Adding File Geodatabase e.g. MM Topo • Navigate to .gdb file • Double click on it • Feature classes in database will be displayed • Select all Feature classes

21. Displaying Data If data is not visible, Right Click on Layer and click Zoom to Layer. It will zoom to the extents of the selected map sheet.

22. Styling vector data in ArcGIS • Vector data (e.g. OS MasterMap, OS VectorMap Local) will not have the same appearance as it does in Digimap, when viewed in ArcGIS • May want to consider styling the data to emphasise certain things on the map, or to try and match the OS cartographic style • For more details see: http://digimap.edina.ac.uk/webhelp/digimapgis/arcgis/standard_arcgis_functions/applying_style_files.htm

23. Styling options In ArcGIS – do this in Symbology tab of map layer properties: Option: apply a layer or style file that contains styling information – find available files in Digimap Help pages. Note: Data information pages for each product has a link to a Style File on it

24. Style files from Digimap • Digimap provides style files for some vector data products • Need to look on the product information page • Find this via the Data Download Information box  More info link • Some can be downloaded from OS website • Some products have the Symbology file in the download zip

25. Other sources of style files For OS MasterMap: • Productivity Suite: – symbology files available with the software but must be used with data processed through Productivity Suite: http://www.esriuk.com/software/arcgis/productivitysuite/download# • InterpOSe: • provide a style file for ArcGIS with the InterpOSe installer • Must be used with data processed through InterpOSe: http://misoportal.com/data/interpose-for-digimap/ • These are data conversion tools often used with OS MasterMap – full details in the Format and Conversion tools page mentioned earlier.

26. Projections and Transformation in ArcGIS Need to think about, if: • You are setting the Coordinate System on an existing dataset • You are overlaying data with different coordinate systems • You want to overlay EsriBasemap data with OS data • See: http://digimap.edina.ac.uk/webhelp/digimapgis/index.htm#projections_and_transformations/transformations_in_arcgis.htm

27. Otherwise: Data in WGS 84 and OSGB 36 What if you want to overlay data or use the EsriBasemaps? • Most EsriBasemap data is in WGS 84 • OS data is in OSGB 36 • Showing VectorMap Local overlaid on the Esri Imagery Basemap • Errors of over 100m by default

28. Common Geoprocessing Tools • Merge • Mosaic • Clip • For details see: http://digimap.edina.ac.uk/webhelp/digimapgis/index.htm#arcgis/standard_arcgis_functions/viewing_data_in_arcmap.htm

29. Vector data – Merge tool • Where your download area covers multiple tiles, possible to merge the tiles into one Image: OS Terrain contours in ArcMap, before merge (SE England)

30. Raster data – Mosaic tool

31. Clip tool • Where tiles are provided in large sizes e.g. 100 x 100 km, possible to clip them to smaller area • To use theclip tool, necessary to have a Shape file of the smaller area to use as the guide Image: Vector Map District clipped to smaller area in ArcMap

32. Poll What software do you use most often with geospatial data? • ArcGIS • QGIS or other open source software • AutoCAD or other CAD software • I don’t use any GIS/CAD software • Other

33. Resources • Digimap Resource centre – access help pages, guides, FAQs, videos, case studies and more.

34. Help pages Digimap Resource centre: http://digimap.edina.ac.uk/webhelp/resources/index.html

35. PDF exercises • Exercises available for download • PDF step by step • Some with data provided

36. Chat • Usually manned in office hours.

37. Poll Today’s webinar: • I learnt something new • I didn’t learn anything new • Was a good use of my time • Was a poor use of my time • Other