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3 rd Party Quality Evaluation Experience with the finnish TDB

3 rd Party Quality Evaluation Experience with the finnish TDB. jorma.marttinen@geoaudit.fi. TDB Quality Model. 1 st edition 1993, 2 nd published 1995 The basic idea: 100% is not possible Test work to define goals Acceptable quality limits (AQL) for completeness and correctness

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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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