Dr John A Stevenson gives a presentation on how he uses open source tools to manage his analysis of volcanic eruptions at the 3rd QGIS user group meeting in Edinburgh on 5th May 2015.

1. Reconstructing volcanic eruptions using
open source GIS tools
John A Stevenson
School of GeoSciences, University of Edinburgh
QGIS Users Meeting - 5 May 2015
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 1 / 15

3. Outline
1 The Hekla 3 and Hekla 4 eruptions
2 Data input, cleaning and storage
3 Analysis and visualisation
4 Conclusions
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 3 / 15

4. The Hekla 3 and Hekla 4 eruptions
Comparision with Eyjafjallajökull 2010
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 4 / 15

5. The Hekla 3 and Hekla 4 eruptions
Comparision with Eyjafjallajökull 2010
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 4 / 15

6. The Hekla 3 and Hekla 4 eruptions
Comparision with Eyjafjallajökull 2010
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 4 / 15

7. The Hekla 3 and Hekla 4 eruptions
Comparision with Eyjafjallajökull 2010
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 4 / 15

8. The Hekla 3 and Hekla 4 eruptions
Deposits are found across Iceland
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 5 / 15

9. The Hekla 3 and Hekla 4 eruptions
Hundreds of locations described and sampled
341 locations, 717 samples and
observations
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 6 / 15

10. The Hekla 3 and Hekla 4 eruptions
Hundreds of locations described and sampled
341 locations, 717 samples and
observations
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 6 / 15

11. Data input, cleaning and storage
gpsbabel and GpsPrune for georeferencing
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 7 / 15

12. Data input, cleaning and storage
Plain text files and Git for raw data
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 8 / 15

13. Data input, cleaning and storage
Python for calculations and data management
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 9 / 15

14. Data input, cleaning and storage
Python for calculations and data management
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 9 / 15

15. Data input, cleaning and storage
Python for calculations and data management
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 9 / 15

16. Data input, cleaning and storage
Python for calculations and data management
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 9 / 15

17. Data input, cleaning and storage
SQLite for storing processed data
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 10 / 15

18. Analysis and visualisation
GRASS GIS for geospatial analysis
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 11 / 15

19. Analysis and visualisation
GRASS GIS for geospatial analysis
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 11 / 15

20. Analysis and visualisation
QGIS for data visualisation
OpenLayers plugin
Geotag and import photos plugin (experimental)
eVis event browser plugin
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 12 / 15

21. Analysis and visualisation
QGIS for data visualisation
OpenLayers plugin
Geotag and import photos plugin (experimental)
eVis event browser plugin
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 12 / 15

22. Analysis and visualisation
Volume of erupted material
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 13 / 15

23. Analysis and visualisation
Volume of erupted material
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 13 / 15

24. Analysis and visualisation
Database makes it easy to subdivide phases
Hekla 3 - Phase A
Hekla 3 - Phase B
Hekla 3 - Phase C
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 14 / 15

25. Analysis and visualisation
Database makes it easy to subdivide phases
Hekla 3 - Phase A
Hekla 3 - Phase B
Hekla 3 - Phase C
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 14 / 15

26. Analysis and visualisation
Database makes it easy to subdivide phases
Hekla 3 - Phase A
Hekla 3 - Phase B
Hekla 3 - Phase C
Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 14 / 15

27. Conclusions
Conclusions
By linking together simple open source tools, with Python
as the glue, it becomes possible to undertake much more
complicated analysis of spatial data.
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Blog: all-geo.org/volcan01010 Email: john.stevenson@ed.ac.uk Twitter: @volcan01010 15 / 15