Distribution de la vgtation sur le globe proposition 分布及233克和V233为主在地球上的建议。.pptVIP

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Distribution de la vgtation sur le globe proposition 分布及233克和V233为主在地球上的建议。.ppt

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EGU-Vienna 28/04/2005 BELMANIP:Benchmark Land Multisite Analysis and Intercomparison of Products F. Baret, J. Morissette, R. Fernandes, J.L. Champeaux, R. Myneni, J. Chen, S. Plummer, M. Weiss, C. Bacour Motivations The validation of biophysical products (LAI, fAPAR, fCover, albedo, …) derived from medium resolution senors could be achieved by: direct comparison to ground measurements : absolute validation such as VALERI, MODLAND, BIGFOOT, CCRS, BSNR… but requires important efforts therefore only few sites available Representativeness of the sites (time/space) Inter-comparison of products (algorithms, sensors) Does not require ground measurements and therefore allow to include a larger number of sites for a better temporal and spatial representativeness Requires a global coordination under CEOS for better efficiency Propose a network of sites covering the whole earth surface and representing the several surface types and conditions Propose a common period for intercomparison Propose a standard format for cross comparison between products Propose a mechanism to share products extracts Objectives Evaluate the representativeness of absolute validation sites Propose a network of sites for indirect evaluation: BELMANIP Inter-comparaison, Temporal consistency Internal consistency of products (LAI/albedo/fAPAR, …) Outlook ECOCLIMAP: brief presentation Main statistics from ECOCLIMAP Representativeness of direct validation sites Building up BELMANIP network FLUXNET AERONET COMPLET Conclusion ECOCLIMAP Statistics derived from ECOCLIMAP Map of dominant components The initial 15 surface types were grouped into 7 components Map of the dominant surface types at 1°? 1° resolution Latitudinal Distribution Annual average LAI map Statistical distribution of LAI Seasonality (only continental surfaces) Representativeness of direct validation sites (DIRECT) VALERI (27) CCRS (27) BIGFOOT (9) Others (35) TOTAL=100 Distribution of LAI for ‘DIRECT’ Improving representativeness: B