1. The geo-wiki open data project: harnessing the power of volunteers and experts to improve data quality on global land-use Steffen Fritz & Mathias Karner Ecosystem Services and Management Program (ESM) IIASA

2. Nature Correspondence, Citizens add to satellite forest maps, Velde, See, Fritz, 342 | NATURE | VOL 490 | 18 OCTOBER 2012

3. Land Cover GLC2000 (1km) MODIS v.5 – 2005 (500m) GlobCover 2005, 2009 (300m) GLC v.2 (1km) Regional products (CORINE, Africover) National products

4. Why is it so important to improve global land cover?  Critical input dataset for many societal benefit areas, e.g. Ecosystems, Biodiversity, Energy, Climate, Disasters  Originally focus and applications - field of climate change projections  Now increasing demand from the integrated assessment community and the global biophysical modelling community, e.g. REDD  Cropland extent has been neglected, but is crucial for applications in the field of food security, assessing yield and production gaps  Also important for investment decisions both by governments as well as foundations (e.g. Gates)

5. Disagreement in Africa in the cropland domain between GLC-2000 and MODIS v. 5 Fritz et al ERL, 2012

6. Motivations behind Geo-Wiki  When different products are compared, there is a lot of disagreement between them  One product might say cropland, another grassland  Confusing if you are a user – which one is correct? Which is the best product to use?  Disagreement overall and/or spatially  Google Earth is one of the only affordable tools available to collect validation points globally (e.g. GlobCover, latest Chinese product)  Repository of validation/calibration data  Create a hybrid global land cover map (i.e. improve land cover)

7. www.geo-wiki.org

8. http://Geo-Wiki.org Geo-wiki makes GEO data easy to visualize and analyze. Volunteers from around the globe can classify Google Earth imagery, input their agreement/ disagreement with the existing data 8

9. Spatial Disagreements

11. Hybrid cropland map http://beta-hybrid.geo-wiki.org

16. Competition.geo-wiki.org

17. Collected more than 200 000 validation points

18. Field Size

19. Human Impact / Wilderness

22. Geo-Wiki Family of Crowdsourcing Tools Contributes to Open Data Livestock

23. New Technologies: Geo-Wiki mobile

25. Collecting Ground Data

26. Gaming Civilization –Paint the landscape –Facebook ~ 93 million audience Tile game Taginator Missions and conspiracies Geocaching

27. Game for Land Cover validation 27

28. Thank you!