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3 rd Party Quality Evaluation Experience with the finnish TDB

Learn about Geoaudit Ltd's 3rd Party Quality Evaluation Experience with the Finnish TDB. Explore AQL, accuracy controls, and the benefits of reliable data. Understand the balance between completeness and accuracy in data quality elements.

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3 rd Party Quality Evaluation Experience with the finnish TDB

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  1. 3rd Party Quality EvaluationExperience with the finnish TDB jorma.marttinen@geoaudit.fi Geoaudit Ltd

  2. TDB Quality Model • 1st edition 1993, 2nd published 1995 • The basic idea: 100% is not possible • Test work to define goals • Acceptable quality limits (AQL) for completeness and correctness • AQL 1, 4, 15 and none • Accuracy 3 m, 5m, 15 m … (95%) Geoaudit Ltd

  3. TDB Quality Model • Internal quality tests in 13 District Survey Offices • sampling according to ISO 2859-1 • rectangular 1 sq km samples • described in Annex F of ISO 19114 (QEP) • External quality tests • accuracy control • logical consistency control • comparison between the 13 offices Geoaudit Ltd

  4. Why a 3rd party? • Independent Quality Evaluation • Stratecig choice of MAF • Customer feedback • Internal market • NLS Central Administration acting as a client • Survey Office in the role of a producer • Quality in key role in the result matrix • matrix of cost, schedule, quality etc. in the best case resulting minor bonuses for employees Geoaudit Ltd

  5. Previously in society… • Money is invented • squirrel hide in Finland Geoaudit Ltd

  6. Previously in society… • Money is invented • Squirrel hide in Finland • More money -> accountants needed • More acountants -> Auditors needed • (spatial) Information is invented… Geoaudit Ltd

  7. Geoaudit Oy est. 2.1.2001 • 60% of turnover from NLS • Metadata implementation & INSPIRE indicate growth potential • Quality evaluation is expensive • What is the benefit for a producer to include reliable data quality results in his metadata? Geoaudit Ltd

  8. Data Quality Elements • Complete, consistent, accurate, timely, correct • Is this the correct order? • Example of the balance between completeness and accuracy: Geoaudit Ltd

  9. Completeness vs. Accuracy • TDB accuracy report 2005 • Mean value of positional uncertainties excluding outliers ~1.50 m • Not normal distribution • Outliers indicate that some features are surveyed in the field • GOOD IF YOU VALUATE COMPLETENESS OVER ACCURACY! Geoaudit Ltd

  10. Thank you for your interest! Geoaudit Ltd

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