Using the History of OSM for
Quality Assessment
Christopher Barron, Pascal Neis, Alexander Zipf
Geoinformatics Research Gr...
How can we evaluate OSM datasets without a
reference dataset?

Christopher Barron, Geoinformatics Research Group,
Institut...
Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidelberg University

3
Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidelberg University

4
Methods for Quality Analysis
based on an OSM-Full-HistoryDump

 Intrinsic Approach

Christopher Barron, Geoinformatics Re...
iOSMAnalyzer - Architecture

Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidelberg Univers...
Examples

Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidelberg University

7
Total Road Network Length (1/6)

Mapped completely

Assumption (Neis et al. 2012):
1)
2)
3)
4)

Motorways/Highways
Seconda...
Total Road Network Length (1/6)

Madrid

Yaoundé

Christopher Barron, Geoinformatics Research Group,
Institute of Geograph...
Positional Accuracy of Junctions (2/6)

Helbich et al. (2012)

Christopher Barron, Geoinformatics Research Group,
Institut...
Positional Accuracy of Junctions (2/6)

Madrid

Christopher Barron, Geoinformatics Research Group,
Institute of Geography,...
Buildings & House Numbers (3/6)

Salzburg

Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heid...
Buildings & House Numbers (3/6)

San Francisco
Christopher Barron, Geoinformatics Research Group,
Institute of Geography, ...
Buildings & House Numbers (3/6)

Yaoundé
Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidel...
Topological Errors (4/6)

San Francisco

Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidel...
Currentness of Data (5/6)

Salzburg

Christopher Barron, Geoinformatics Research Group,
Institute of Geography, Heidelberg...
Roads without a name or ref Tag (6/6)

Yaoundé

Christopher Barron, Geoinformatics Research Group,
Institute of Geography,...
Summary
• Q = {V1, V2 … Vn-1}
• OSM quality analyses …
– based on OSM-Full-History-Dumps;
– are possible without reference...
https://github.com/zehpunktbarron/iOSMAnalyzer
GNU GPL Version 3

Christopher Barron, Geoinformatics Research Group,
Insti...
Thank you for your attention!

Christopher Barron
Geoinformatics Research Group
Heidelberg University
http://giscience.uni...
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Using the history of OSM for quality assessment - State of the Map 2013

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*** Presented by Christopher Barron at State of the Map 2013
*** For the video please see http://lanyrd.com/2013/sotm/scphkr/
*** Full schedule also available at http://wiki.openstreetmap.org/wiki/State_Of_The_Map_2013

For the purpose of data quality evaluation OSM is almost always compared with reference datasets. However, these datasets are not always accessible due to the lack of availability, contradictory licensing restrictions or high procurement costs. An OSM-Full- History Dump can serve as an alternative source for quality evaluations. Using so-called intrinsic indicators the quality of OSM datasets can be assessed with the help of the data's history. We will present why and how the history of OSM objects matter and which tools were used. For this purpose, examples for selected cities around the world are analysed and compared with each other to reveal differences in terms of OSM data quality based on the history of the dataset's objects.

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Using the history of OSM for quality assessment - State of the Map 2013

  1. 1. Using the History of OSM for Quality Assessment Christopher Barron, Pascal Neis, Alexander Zipf Geoinformatics Research Group, Institute of Geography Heidelberg University Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University
  2. 2. How can we evaluate OSM datasets without a reference dataset? Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 2
  3. 3. Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 3
  4. 4. Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 4
  5. 5. Methods for Quality Analysis based on an OSM-Full-HistoryDump  Intrinsic Approach Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 5
  6. 6. iOSMAnalyzer - Architecture Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 6
  7. 7. Examples Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 7
  8. 8. Total Road Network Length (1/6) Mapped completely Assumption (Neis et al. 2012): 1) 2) 3) 4) Motorways/Highways Secondary/Tertiary Roads Residential Roads Tracks, Paths, etc. Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 8
  9. 9. Total Road Network Length (1/6) Madrid Yaoundé Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 9
  10. 10. Positional Accuracy of Junctions (2/6) Helbich et al. (2012) Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 10
  11. 11. Positional Accuracy of Junctions (2/6) Madrid Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 11
  12. 12. Buildings & House Numbers (3/6) Salzburg Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 12
  13. 13. Buildings & House Numbers (3/6) San Francisco Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 13
  14. 14. Buildings & House Numbers (3/6) Yaoundé Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 14
  15. 15. Topological Errors (4/6) San Francisco Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 15
  16. 16. Currentness of Data (5/6) Salzburg Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 16
  17. 17. Roads without a name or ref Tag (6/6) Yaoundé Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 17
  18. 18. Summary • Q = {V1, V2 … Vn-1} • OSM quality analyses … – based on OSM-Full-History-Dumps; – are possible without reference datasets; – are arbitrarily repeatable. Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 18
  19. 19. https://github.com/zehpunktbarron/iOSMAnalyzer GNU GPL Version 3 Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 19
  20. 20. Thank you for your attention! Christopher Barron Geoinformatics Research Group Heidelberg University http://giscience.uni-hd.de christopher.barron@geog.uni-heidelberg.de Christopher Barron, Geoinformatics Research Group, Institute of Geography, Heidelberg University 20

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