Building a Crowd-sourcing Tool for the Validation of Urban Extent and Gridded Population
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Building a Crowd-sourcing Tool for the Validation of Urban Extent and Gridded Population

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Building a Crowd-sourcing Tool for the Validation of Urban Extent and Gridded Population...

Building a Crowd-sourcing Tool for the Validation of Urban Extent and Gridded Population
Steffen Fritz, Linda See, Ian McCallum, Michael Obersteiner - International Institute of Applied Systems Analysis
Christian Schill - University of Freiburg
Christoph Perger - University of Applied Sciences Wiener Neustadt

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Building a Crowd-sourcing Tool for the Validation of Urban Extent and Gridded Population Presentation Transcript

  • 1. Building a Crowd-sourcing Tool for the Validation of Urban Extent and Gridded Population
    Steffen Fritz, Linda See, Ian McCallum, Christian Schill, ChristophPerger and Michael Obersteiner
    International Institute of Applied Systems Analysis (IIASA)
    Austria
  • 2. Importance of global land cover
    Global land cover is baseline information for a wide variety of application:
    To delineate ecosystems
    Inputs to global models of land use and land use change, e.g. Globiom
    Climate change mitigation policies e.g. REDD
    Biofuel debate: where is the additional land?
    Food security
  • 3. Problems with global land cover
    When different products are compared, there are lots of disagreement between them
    One might say cropland, another forest
    Confusing if you are a user – which one is correct? Which is the best product to use?
    Study by Quaife et al – on veg modelling
    Disagreement overall and/or spatially
  • 4. Disagreement in Crop/Forest Domains
  • 5. Spatial disagreement
  • 6. Urban areas
    Rapid urbanisation – led to many problems
    > 50% of the world’s pop live in cities
    By 2050, set to increase to 80%
    Accurate figures needed to estimate resource use, e.g. future carbon emissions, domestic water consumption, infrastructure, housing, etc.
    Difficult to classify
  • 7.
  • 8. Estimates from different products
  • 9. Disagreement in the urban domain
  • 10. Urban disagreement between GLC-2000 and MODIS
  • 11.
  • 12.
  • 13. geo-wiki.org
    Crowd-sourcing application to improve land cover
  • 14. Architecture
  • 15. urban.geo-wiki.org
  • 16. Disagreement layers
  • 17. Validation of urban land cover
  • 18. Validation of urban land cover
  • 19. GRUMP population layer
  • 20. Future Developments for urban.geo-wiki.org
    Building a hybrid map of urban areas – already carried out for the cropland domain
    Addition of other datasets
    E.g. Night time luminosity, Open Street Map
    Ability to validate the population data
    Addition of a gaming element
    Change studies through integration of Landsat imagery
    30 m land cover map being developed
  • 21. Validation Competition
    We will be running a competition this summer
    Email me (see@iiasa.ac.at) or see me afterwards and I will put you on the mailing list
    Register for urban.geo-wiki.org
    Validate at least 100 points to qualify
    Highest number of validations will be awarded a prize
  • 22. Thank you!
    For further information, please contact us:
    Steffen Fritz (fritz@iiasa.ac.at)
    Linda See (see@iiasa.ac.at)