| Date post: | 15-Jan-2015 |
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Steffen Fritz
Livestock Systems and Environment (LSE) Seminar
ILRI, Nairobi, 27 February 2014
Geo-wiki.org: A global platform to visualize, crowd-source and improve information on
global land cover and land use
Geo-wiki.org: a global platform to
visualize, crowd-source and
improve information on global land
cover and land use
Steffen Fritz
Food and Water
Ecosystem Services and Management
Group Leader: Earth Observation Systems
Crowdsourcing• Outsourcing to the crowd (Howe, 2006)
– E.g. Amazon’s Mechanical Turk
– Wikipedia
With geographic context termed Volunteered
Geographic Information
– Open Streetmap
– Geo-wiki
• Different levels of participation (passive and
active)
Technology In-Situ Value Added
Mobile Phones
Mobile Money
Interested Citizens
Existing Communities
Improved
Land Cover data
Reliable statistics
Land-use change
Extending Geo-wiki to ground based data collection
GLOBIOM
A global recursively
dynamic partial equilibrium
model integrating the
agricultural, bioenergy
and forestry sectors with
the aim to give policy
advice on global issues
concerning land use
competition between the
major land-based
production sectors.
Environmental Resources
and Development
Land Cover
• GLC2000 (1km)
• MODIS v.5 – 2005 (500m)
• GlobCover 2005, 2009 (300m)
• GLC v.2 (1km)
• Regional products (CORINE,
Africover)
• National products
Disagreement in Africa in the cropland domain between GLC-2000 and MODIS v. 5
Fritz et al ERL, 2012
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)
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)
www.geo-wiki.org
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 12
Spatial Disagreements
Cropland
Fritz et al, 2013, Environmental Science and technology
Downgrading recent estimates of
land availability using crowdsourcing
Cai et al., 2011
1107 mil. hectares
Fritz et al.
375 mil. hectares
Field Size
Human Impact / Wilderness
Land acqisitions
Source: WorldMapper.org
Deaths related to Drought
Land Grabbing
Source: http://www.petergiovannini.com/Landgrabbing/index.html
Source: Anseeuw et al. (2012) – Transnational Land Deals for Agriculture in the Global South
(Hectares) (# of
deals)
www.geo-wiki.org
`
Land Acquisition
Area
(from Land Matrix
Database)
+Clear Evidence
of Settlements
(from Geo-Wiki
Hackathon)
=Areas
of Conflict
Risk for conflict
Geo-Wiki Family of Crowdsourcing
Tools
Livestock
Cities
Choose a branch
Geo-Wiki Pictures
Photo upload
Provide feedback
Settings
Creating a Custom Legend
Custom Legend in the App
Farmsupport app
Expert Crowd Treated Crowd
How can we gain confidence in the crowdsourced data?
Foody, See, Fritz et al., 2013
How can we integrate the crowdsourced
data?
- Calibration / Validation of Remotely Sensed
Maps
- Map integration and hybrid map generation using
many different sources including crowdsourced
and authorative data
Geo-wiki.org or Tablets of phones: search for ‘cropland capture’
Release date is 10. November 2013
