Quality assessment for crowdsourced geographic information

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Quality assessment for crowdsourced geographic information

  1. 1. Quality Assessment for Crowdsourced Geographic Information Martijn van Exel Geodan S&R
  2. 2. www.geodan.nl The Challenge > Hundreds of thousands of users contribute information > Each individual has his own intents, purposes, motivations,knowledge and skill level, tools > No moderation and a minimal imposed data model > Uneven geographical spread of contributor efforts
  3. 3. www.geodan.nl The Challenge > Therefore: > No uniform lineage > No consistent levels of: – Data and metadata completeness – Positional accuracy – Temporal accuracy > How to assess data quality?
  4. 4. www.geodan.nl Crowd Quality > A novel approach to assessing quality of crowdsourced geographic information > Leveraging user and data dynamics unique to crowdsourcing: – User Rating – Feature version – Feature age and persistance – Spatial Flux
  5. 5. www.geodan.nl Advantages > No reference dataset required – All metrics can be derived from the dataset itself > Appreciative of local variations in quality unique to crowdsourcing
  6. 6. www.geodan.nl Geodan S&R President Kennedylaan 1 1079 MB Amsterdam (NL) Tel: +31 (0)20 – 5711 311 Fax: +31 (0)20 – 5711 333 E-mail: info@geodan.nl Web: www.geodan.nl Copyright © Geodan 2006 This document is provided for information purposes only and the information herein is subject to change without notice. Geodan does not provide any warranties covering and specifically disclaiming any liability in connection with this document. Geodan is a registered trademark. All other company and product names mentioned are used for identification only and may be trademarks of their respective owners. All pictures and illustrations are provided for information only and do not necessarily represent a realistic visualization of the services described in this document.
  7. 7. www.geodan.nl Geodan S&R President Kennedylaan 1 1079 MB Amsterdam (NL) Tel: +31 (0)20 – 5711 311 Fax: +31 (0)20 – 5711 333 E-mail: info@geodan.nl Web: www.geodan.nl Copyright © Geodan 2006 This document is provided for information purposes only and the information herein is subject to change without notice. Geodan does not provide any warranties covering and specifically disclaiming any liability in connection with this document. Geodan is a registered trademark. All other company and product names mentioned are used for identification only and may be trademarks of their respective owners. All pictures and illustrations are provided for information only and do not necessarily represent a realistic visualization of the services described in this document.

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