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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
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Nature Correspondence, Citizens add to satellite forest maps, Velde, See, Fritz, 342 | NATURE | VOL 490 | 18 OCTOBER 2012
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Land Cover GLC2000 (1km) MODIS v.5 – 2005 (500m) GlobCover 2005, 2009 (300m) GLC v.2 (1km) Regional products (CORINE, Africover) National products
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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)
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Disagreement in Africa in the cropland domain between GLC-2000 and MODIS v. 5 Fritz et al ERL, 2012
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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)
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www.geo-wiki.org
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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
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Spatial Disagreements
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Hybrid cropland map http://beta-hybrid.geo-wiki.org
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Competition.geo-wiki.org
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Collected more than 200 000 validation points
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Field Size
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Human Impact / Wilderness
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Geo-Wiki Family of Crowdsourcing Tools Contributes to Open Data Livestock
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New Technologies: Geo-Wiki mobile
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Collecting Ground Data
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Gaming Civilization –Paint the landscape –Facebook ~ 93 million audience Tile game Taginator Missions and conspiracies Geocaching
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Game for Land Cover validation 27
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Thank you!
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