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Influences on Data Quality

Influences on Data Quality. Gerhard Navratil Institute for Geoinformation and Cartography 28.6.2006 GeoGeras. Outline. Problem Technical Limitations Legal Factors User Needs Interrelations Combined Influences Conclusions. Problem (1). Tiers of Ontology (Frank 2001)

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Influences on Data Quality

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  1. Influences on Data Quality Gerhard Navratil Institute for Geoinformation and Cartography 28.6.2006 GeoGeras

  2. Outline • Problem • Technical Limitations • Legal Factors • User Needs • Interrelations • Combined Influences • Conclusions Gerhard Navratil

  3. Problem (1) Tiers of Ontology (Frank 2001) • Tier 0: Physical Environment • Tier 1: Observation • Tier 2: Objects • Tier 3: Society • Tier 4: Cognitive Agents Gerhard Navratil

  4. Problem (2) Tiers of Ontology vs. Quality Measures • Tier 0: Physical Environment Not necessary • Tier 1: Observation Data Quality • Tier 2: Objects Uncertainty • Tier 3: Society ??? • Tier 4: Cognitive Agents Fitness for Use Gerhard Navratil

  5. Problem (3) • We need: Quality measures for influences of the society • Derived from: Law texts • Question: How can we connect the laws with the other influences? • Presented here: Influences of society and user needs on the data quality Gerhard Navratil

  6. Problem (4) Different influences on data quality • Technical limitation (process of data acquisition) • Legal restrictions(society needs) • User requirements Gerhard Navratil

  7. Technical limitations • Higher quality Higher costs • Absolute limitatione.g. estimated relativestandard uncertainty of 1m: 2,5*10-11 • Examples: Satellite images, GPS Gerhard Navratil

  8. Legal Restrictions • Laws influence data quality by • Influencing data collection (cadastre, statistics) • Access restrictions • Weak limitation (laws can be broken) • Examples: Demographic data, data on spatial planning Gerhard Navratil

  9. User Needs • Assumption: Larger number of users  higher data quality • Evidence: Christoph Schlieder – data capturing with the help of communities • Examples: Topographic maps (main user military), nautical maps Gerhard Navratil

  10. Interrelations • Law-Technology: Legal restrictions to use possibilities provided by technology (land register) • Law-Usability: Design of business process according to available public data (PSI, INSPIRE) • Usability-Technology: Technological development thrives if needed Gerhard Navratil

  11. Combined Influences • Orthoimages: Technology + Lawe.g. Legal restrictions on flying heights, military security • Marketing Data: Law + Usabilitye.g. data protection laws • Cadastral Data: Usability + Technologycreated for tax authority and land owners (boundaries) Gerhard Navratil

  12. Conclusions • There is an influence of laws, users, and technology on data quality • These parameters are not independent • There are measures to deal with technological influences • Fitness for use deals with user needs • A measure for legal (social) components is missing– fuzzy problem (laws are broken) Gerhard Navratil

  13. Thank You • Questions? References for further reading Navratil, G. (2004). How Laws affect Data Quality. ISSDQ. Navratil, G. and A. U. Frank (2005). Influences Affecting Data Quality. ISSDQ. Navratil, G., C. Twaroch and F. Twaroch (2005). Nutzung von Katasterdaten - wie genau wird die Grenze benötigt? AGIT. Navratil, G. (submitted). Modeling Influences on Data Quality with Possibility-Distributions. ACM GIS. Gerhard Navratil

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