Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

8B_2_Using sound to represent uncertainty in address locations

855 views

Published on

Session 8B, Paper 2

  • Be the first to comment

  • Be the first to like this

8B_2_Using sound to represent uncertainty in address locations

  1. 1. Using Sound to Represent Uncertainty in Address Locations Nick Bearman and Andrew Lovett PhD School of Environmental Science University of East Anglia [email_address] ; [email_address]
  2. 2. Introduction <ul><li>Using sound to represent uncertainty* in address locations </li></ul><ul><ul><li>*positional accuracy </li></ul></ul><ul><ul><li>Created an extension to ArcGIS </li></ul></ul><ul><ul><li>Evaluated this using 49 users of spatial data (OS, UEA & LA) </li></ul></ul><ul><ul><li>Comparing Visual and Sonic methods </li></ul></ul>Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps
  3. 3. OS MasterMap ® Address Layer 2 11B Clarendon Road Norwich NR2 2PN Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps
  4. 4. <ul><li>Uncertainty can be very important </li></ul><ul><ul><li>Depending on what you are doing with the data </li></ul></ul><ul><li>Uncertainty in AL2 </li></ul><ul><ul><li>Contains 5 different status flags </li></ul></ul><ul><ul><li>Including Positional Accuracy </li></ul></ul><ul><ul><li>Which some users ignore </li></ul></ul><ul><ul><li>Why? </li></ul></ul><ul><ul><ul><li>it's not relevant </li></ul></ul></ul><ul><ul><ul><li>users don't think it's relevant (when it is) </li></ul></ul></ul><ul><ul><ul><li>users can't access the information within the data </li></ul></ul></ul><ul><ul><ul><li>users can't display the information </li></ul></ul></ul><ul><ul><ul><li>the information isn't available </li></ul></ul></ul>Why AL2 & Uncertainty? Merrifield Cottage TR16 5DA Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps
  5. 5. <ul><li>Vision can be saturated </li></ul><ul><li>Alternatives to Vision </li></ul><ul><ul><li>Vision can be used more effectively – but there are limits </li></ul></ul><ul><ul><li>Sound is the next most powerful sense </li></ul></ul><ul><li>Little Previous Research </li></ul><ul><ul><li>These were pilot studies, custom coded. Need to move these to a generic, easily usable environment </li></ul></ul><ul><ul><li>No user testing & no existing research frameworks </li></ul></ul><ul><li>Piano Notes </li></ul><ul><ul><li>Easy to understand – good order </li></ul></ul><ul><ul><li>CEG Triad, preferred option </li></ul></ul><ul><ul><li>Possibly could have chosen anything though </li></ul></ul>Why Sound? http://kbark.wordpress.com/2006/12/17/where-am-i/ (18/03/2009) Finnish Town http:// www.politics.co.uk /news/policing-and-crime/ new-police-crime-maps-confusing--$1272816.htm (18/03/2009) London Crime Fisher (1994) Fisher (1994) Uncertainty and Soil Type MacVeigh & Jacobson (2007) MacVeigh & Jacobson (2007) Harbour, Sea and Land Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps
  6. 6. <ul><li>AL2 Positional Accuracy </li></ul><ul><li>Prototype the extension </li></ul><ul><ul><li>Pilot studies & improvement </li></ul></ul><ul><ul><li>Reduce 5 categories (sounds) to 3 </li></ul></ul>Methods 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). Value Surveyed Approximate Postcode Unit Mean Estimate Postcode Sector Mean Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps
  7. 7. Evaluation <ul><li>Computer Based Questionnaire </li></ul><ul><ul><li>Presentation Methods </li></ul></ul><ul><ul><li>Participants asked to choose proportion of values that had AL2 PQA Value of Surveyed (25%, 50%, 75%) </li></ul></ul><ul><ul><li>Demo </li></ul></ul><ul><li>Discussion Session </li></ul>Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps None AL2 Positional Accuracy Visual only AL2 Positional Accuracy Council Tax bands Visual and Sonic representing different variables AL2 Positional Accuracy AL2 Positional Accuracy Visual and Sonic representing the same variable AL2 Positional Accuracy Topography outlines only Sonic only Sonic Data Visual Data Presentation Method
  8. 8. <ul><li>Two main factors </li></ul><ul><ul><li>Proportion of data (p < 0.005) </li></ul></ul><ul><ul><ul><li>Logical, but no evidence of this in GI literature </li></ul></ul></ul><ul><ul><li>Presentation method (p < 0.05) </li></ul></ul><ul><ul><ul><li>As expected </li></ul></ul></ul><ul><ul><li>Logistic Regression </li></ul></ul><ul><ul><ul><li>Also Knowledge of the Data appeared to have an impact – but when this was added into the logistic regression, it wasn’t significant. </li></ul></ul></ul><ul><li>Discussion Sessions </li></ul><ul><ul><li>Greater differences between sounds </li></ul></ul><ul><ul><li>Colour blind users </li></ul></ul>Results Factors added to Model -2 Log Likelihood Cox & Snell R 2 Proportion 182.01 0.043 Presentation Method 169.579 0.105 Knowledge of the Data 167.319 0.116 Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps 0.88 75% 0.62 0.74 Mean Score Proportion 25% 50% 0.82 Visual 0.65 0.67 0.86 Mean Score Presentation Method Visual Sonic Same Sonic Visual Sonic Different
  9. 9. Next Steps <ul><li>Summary </li></ul><ul><ul><li>Sound can work </li></ul></ul><ul><ul><li>Proportion of Data and Presentation Method </li></ul></ul><ul><ul><li>Knowledge of Data </li></ul></ul><ul><li>Improvements </li></ul><ul><ul><li>Task </li></ul></ul><ul><li>Next data </li></ul><ul><ul><li>UKCP09 </li></ul></ul><ul><ul><li>VR Visualisations of Future Landscapes </li></ul></ul>Introduction Why AL2 & Uncertainty? Why Sound? Methods Results Next Steps

×