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Lessons learned from disaggregating population data by using different data sources.

Lessons learned from disaggregating population data by using different data sources. Radoslaw Jablonski Central Statistical Office of Poland RJablonski@stat.gov.pl. Agenda. Aim of the project Data types used in project Test area Review of used method for solving the disaggregation problem

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Lessons learned from disaggregating population data by using different data sources.

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  1. Lessons learned from disaggregating population data by using different data sources. Radoslaw Jablonski Central Statistical Office of Poland RJablonski@stat.gov.pl EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  2. Agenda • Aim of the project • Data types used in project • Test area • Review of used method for solving the disaggregation problem • Conclusions EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  3. Aim of the project • Aggregate demographic data using the top-down approach for the entire country. • Deaggregate demographic data using the bottom-up approach for the entire coutry. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  4. Data types used in project. • Bottom-up method: • Address points data set with population form Census 2011. • Grid data set series 1x1km (GRID_ETRS89_LAEA_1K) • Top-down method: • Enumeration area districts with population from Census 2011. • High resolution soil sealing layer for the year 2006. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  5. Test area Subregion Piotrkowski was chosen for testing the bottom-upand top-down method . Municipalities: • Cities – (4) • Rural communes – (42) • Urban section in a rural-urban commune – (7) • Rural section in a rural-urban commune – (7) EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  6. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  7. Top-down method - assumption • Using the smallest statistical regions in order to minimize error of the spatial distribution. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  8. Top-down method - assumption • Using the SSL to increase the accuracy of address points distribution. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  9. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  10. Top-down and bottom-up methods – in details EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  11. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  12. What can we do, in terms of Grid, to avoid ‘holes’ in the population? • We can at best spread a population equally from over one or multiple districts, which are contain in a grid cel. • SSL will not be treated as the only determinant of population assignment for grid but may be at best used as a „weight”. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  13. Quality indicator - verifying the accuracy of the estimating population method. Having a set of reference data (the actual population from points of the address assigned for 1km grid squares) we can determine the error of tested top-down method. quality indicator = absolute value(An – Bn)/max(An,Bn) where:An - the value of the population in the n-th grid cell reference set od data A (bottom-up method)Bn - the value of the population in the n-th grid cell with the values of the calculated B (top-down method) EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  14. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  15. Conclusions! CLC data can be usefull as a main factor in determination less populated area. This factor helps you reduce noise in: rural communes and rural section in a rural-urban commune. In this way will allow us to achieve better results in the calculation of the estimated values. EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

  16. Thank you for your attention. Radoslaw Jablonski Central Statistical Office of Poland RJablonski@stat.gov.pl EUROPEAN FORUM FOR GEOSTATISTICS CONFERENCE (EFGS) 12-14 October 2011 - Lisbon, Portugal

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