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Global land cover validation activities

Martin Herold (FSU Jena) & Mark Friedl (UBoston) CEOS Cal/Val land subgroup (land cover). Global land cover validation activities. With contributions from Curtis Woodcock (UBoston), Olivier Arino (ESA), Pierre Defourny (UCL), Steve Stehman (SUNY).

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Global land cover validation activities

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  1. Martin Herold (FSU Jena) & Mark Friedl (UBoston) CEOS Cal/Val land subgroup (land cover) Global land cover validation activities With contributions from Curtis Woodcock (UBoston), Olivier Arino (ESA), Pierre Defourny (UCL), Steve Stehman (SUNY) CEOS WGCV LPV Focus Group Lead Meeting, Missoula, Montana, June 15, 2009 www.fao.org/gtos/gofc-gold www.gofc-gold.uni-jena.de Global Observations of Forest Cover and Land Dynamics

  2. Activities • Political initiatives driving observation progress and needs for validation • Observing land cover as ECV • Independent quality assessment and integration • Global land cover observations and accuracy assessments • MODIS and GLOBCOVER • Best use of existing reference datasets • Coordinated effort to develop LC validation database • Accuracy assessment for fine-scale land cover change and area estimates • Post-Kyoto agreement and best practices

  3. GLOBCOVER (2005/6) Dataset release: September 2008

  4. GLOBCOVER validation More than 4300 validation points interpreted by int. experts Blue points: Globcover project (3835 points) + Gond’s set (n~80) (including 225 double interpretation by 2 experts) Brown points: IMWI data (403 points) Global area weighted accuracy: ~73 % based on 3167 reference points Validation report available ~ 15. October 2008 4

  5. MODIS Collection 5 Land Cover (2001-present)

  6. MODIS Land Cover Validation1860 Training Sites – Cross Validation

  7. Notion of a “Best Currently Available” Land Cover Map Need for comparative assessment and synthesis products Combine the strengths of multiple sources of land cover data across multiple extents and resolutions (national, regional and global sources) Based on what is learned in the validation exercise A transparent and community endorsed activity LCCS compatibility is critical Simple guidance criteria: more accurate is better finer spatial resolution is better more thematic detail is better

  8. Thematic standards Reference database (GLC2000) Comparative validation & assessment Probability

  9. Validation of new products Primary validation Updated valid./change Comparative validation Product synergy Data reprocessing Link to regional datasets Degree of usability and flexibility Legend translations In-situ global Updated interpretations LCCS-based Interpretation (Regional Networks) Reference database: statistically robust, consistent, harmonized, updated, and accessible Design based sample of reference sites Operational lc validation framework Existing global LC products Time

  10. Current Status – Early Stages of Stratification and Sample Design Workshop tentatively planned for late July in Boston

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