Usability of GI – case study using address locations

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability of GI – Case Study using Address Locations Nick Bearman PhD School of Environmental Science University of East Anglia n.bearman@uea.ac.uk

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Introduction • Background – “Using sound to represent uncertainty in spatial data” • Today – Usability of OS MasterMap® Address Layer 2 • Usability is important • But usability of the data is very intertwined with how it is represented – particularly if the users have to represent it themselves

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex OS MasterMap ® Address Layer 2 11B Clarendon Road Norwich NR2 2PN

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex AL2 Status Flags Code Type Description OS_SF_MS OS Match Status The quality of the match between Ordnance Survey data and Royal Mail address data. OS_SF_PS OS Physical Status The existence of the building/structure. OS_SF_PQA OS Position The accuracy of the geographical position, as Accuracy a result of how it was acquired. OS_SF_PQ OS Position Status Whether the address is in a final or provisional geographical position. OS_SF_ST OS Structure Type Whether the structure is permanent or temporary. Value Description Surveyed Within the building that the address refers to. Approximate Usually within 50m. Postcode Unit Mean Mean position calculated from correctly located points within the postcode unit (e.g. NR4 6AA is a postcode unit). Estimate Usually within 100m. Postcode Sector Mean Mean position calculated from correctly located points within the postcode sector (e.g. NR4 6__ is a postcode sector).

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex AL2 Status Flags Cottage Merrifield Code Type TR16 5DA Description OS_SF_MS OS Match Status The quality of the match between Ordnance Survey data and Royal Mail address data. OS_SF_PS OS Physical Status The existence of the building/structure. OS_SF_PQA OS Position The accuracy of the geographical position, as Accuracy a result of how it was acquired. OS_SF_PQ OS Position Status Whether the address is in a final or provisional geographical position. OS_SF_ST OS Structure Type Whether the structure is permanent or temporary. Value Description Surveyed Within the building that the address refers to. Approximate Usually within 50m. Postcode Unit Mean Mean position calculated from correctly located points within the postcode unit (e.g. NR4 6AA is a postcode unit). Estimate Usually within 100m. Postcode Sector Mean Mean position calculated from correctly located points within the postcode sector (e.g. NR4 6__ is a postcode sector).

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Why is the data not used? • Knowledge about the data – The fact that it is there – The fact it is important & what it means

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Why is the data not used? • Knowledge about the data – The fact that it is there – The fact it is important & what it means • Usability of the data – Information itself – Visualisation used – Application used – Complex interaction of application, visualisation and information

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Why is the data not used? • Knowledge about the data – The fact that it is there – The fact it is important & what it means • Usability of the data – Information itself – Visualisation used – Application used

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Why is the data not used? • Knowledge about the data – The fact that it is there – The fact it is important & what it means • Usability of the data – Information itself – Visualisation used – Application used – Complex interaction of application, visualisation and information

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability Issues: Information • Knowing the information is there

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability Issues: Information • Knowing the information is there • How the information is represented within the data AL2 - Value Surveyed Approximate Postcode Unit Mean Estimate Postcode Sector Mean

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability Issues: Information • Knowing the information is there • How the information is represented Address Point within the data AL2 - Value Surveyed Approximate Postcode Unit Mean Estimate Postcode Sector Mean

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability Issues: Visualisation Visualisation of uncertainty data needs to be clear without obscuring the original data.

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability Issues: Visualisation Visualisation of uncertainty data needs to London Crime Finnish Town be clear without obscuring the original data. http://kbark.wordpress.com/2006/12/17/where-am-i/ (18/03/2009) http://www.politics.co.uk/news/policing-and-crime/ new-police-crime-maps-confusing--$1272816.htm (18/03/2009)

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Sound Demo

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Usability Issues: Application • GIS Applications are not designed to deal with uncertainty

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Complex Interaction: Application + Visualisation + Information Finnish Town AL2 - Value Surveyed Approximate Postcode Unit Mean Estimate Postcode Sector Mean http://kbark.wordpress.com/2006/12/17/where-am-i/ (18/03/2009)

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Why/How should use be increased? • Why is easy: – issues with use of uncertainty data, – routing applications • How is trickier: – More education about what uncertainty means – More available / accessible metadata / uncertainty information

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Reflection on Evaluation Issues Evaluating the Usability of Sound / Data (ish) • Did respondents get distracted by interface issues? – They were used to ArcGIS, so it was not novel, but the interface probably limited what they could get out of the sonification • The method of sonification – movement of mouse, hard to remember all of the sounds. Next case study will be different as I am not limiting myself to GIS users.

Address Usability Usability Usability Background Evaluation Layer 2 Data Visualisation Complex Summary • Usability is important • AL2 has useful uncertainty data in it – But it’s often ignored • Potentially because: – Knowledge that information is there – Information in difficult to access format – Ability to visualise data – Ability of application to utilise data • Sound might help with this • But need to remember the user – they need to know it is important in order to utilise the data

Usability of GI – case study using address locations

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Usability of GI – case study using address locations — Presentation Transcript

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