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Validation of Geoland2 Products: Phenological Vegetation Trends over Europe

This article discusses the validation approach for phenological vegetation trends in the Geoland2 project, focusing on biophysical variables, methodology, and products. It also explores the collaboration with other projects and provides access to Geoland2 products.

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Validation of Geoland2 Products: Phenological Vegetation Trends over Europe

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  1. Approach for validation of geoland2 products: phenological vegetation trends over Europe R. Lacaze1, P. Cayrol2, F. Baret3 1HYGEOS, 2Spot image, 3INRA

  2. Outline • The Geoland-2 project • Context: GMES & Land Monitoring Core Service (LMCS) • Objective, concept and structure of the project • Validation of biophysical variables • Phenology in geoland2 • Definition of metrics • Methodology • Products • How to validate ? 2

  3. Context • Global Monitoring for Environment and Security (GMES) aims at providing, on a sustained basis, reliable and timely geo-information services related to environmental and security issues in support of public policy makers’ needs • GMES is an EU-led initiative, in which ESA implements the space component and the European Commission manages actions for developing services, relying on both in-situ and space-borne remote sensing data. • GMES is the European contribution to GEO/GEOSS • GMES basic architecture • Infrastructures: In-situ and Space data • Core Services : Generic products • Down-stream services: End-users applications • “Fast Track” Services • Marine Monitoring • Emergencies Response • Land Monitoring 3

  4. FP7 Fast Track Service Land project: geoland2 • Objectives: • To prepare, validate, and demonstrate pre-operational service chains and products of the LMCS • To propose the specific functional organisation of LMCS

  5. geoland2 : Functional view 3 Core Mapping Services Euroland (Land Cover) BioPar ( Biophysical Products) SATChMo (Seasonal Monitoring) 7 Core Information Services Land Carbon Global Crop Monitoring Natural Resource Monitoring in Africa (NARMA) Agri-Environment Forest Water Spatial Planning 5

  6. geoland2 : links between CMS and CIS 6

  7. Validation of BioPar products • Following the guidelines defined by LPV sub-groups • Biophysical: LAI, FAPAR, FCover • Surface radiation: Albedo • Land Surface Temperature • Fire & Burnt Areas • Soil moisture • Generic approach: • Inter-comparison with other existing products • Spatial consistency • Overall evaluation of products (maps, difference maps) • Statistical analysis (RMSE, bias, r) • Temporal consistency • Direct validation • Ground local measurements • HR maps

  8. Phenology in geoland2 • Definition of phenological metrics: • Start of growing season (a) : first date when value = MinValLeft + 10% • End of season (b) : second date when value = MinValRight + 10% or value = MaxVal – 90% • Maximum of growing season (e) : time for peak • Length of season (g) : length = End (b) – Start (a). • Time for the mid of the season (e) : computed as the mean value of the times corresponding to 30% of the amplitude a b e a g b i g FCover i a b e

  9. Phenology in geoland2 – Methodology - 1 Temporal seriesMERIS data Corine Land Cover 2006 • Pixel extraction of vegetation classes • FCOVER averaged per analysis unit (e.g. hydro units) BiophysicalProcess Hydro units FCOVER maps (pixel scale)

  10. Phenology in geoland2 – Methodology - 2 Start of growing season End of season Length of season

  11. Phenology in geoland2 - Products • Spatial coverage: • Adour-Garonne Basin + Marne Basin (France) derived from MERIS FCOVER, 300m resolution • Poland, Swedish & Finnish sites derived from MODIS NDVI, 250m resolution • Temporal coverage: • From 2009 to 2012 • Updated every 10 days

  12. Phenology in geoland2 – Validation approach • Same approach as for Biophysical variables: • Inter-comparison with existing satellites products: comparison MERIS / MODIS products in geoland2 • Comparison with in-situ data • SnowCarbo project network: phenological observations 2001-2008, birch, scotts pines • Flux measurements stations: start and end of photosynthetic active period • COST Action: “Establishing a European data platform for climatological applications” has listed phenological networks http://www.pik-potsdam.de/~rachimow/epn/html/frameok.html • Collaboration with PHAVEOS project ?

  13. Portal, Contacts • Access to geoland2 products: • http://www.geoland2.eu • Biophysical products: • BioPar Task Manager: Roselyne Lacaze, rl@hygeos.com • Scientific contact for vegetation products: Frederic Baret, baret@inra.fr • Phenology product from MERIS: • Scientific contact: Pascale Cayrol, pascale.cayrol@infoterra.fr

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