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[1] This study investigates the performances of four major global Leaf Area Index (LAI) products at 1/11.2° spatial sampling and a monthly time step: ECOCLIMAP climatology, GLOBCARBON (from SPOT/VEGETATION and ATSR/AATSR), CYCLOPES (from SPOT/VEGETATION) and MODIS Collection 4 (main algorithm, from MODIS/TERRA). These products were intercompared during the(More)
Multidirectional observation from the spaceborne POLDER (Polarization and Directionality of the Earth Reflectance) instrument makes it possible to measure the bidirectional reflectance of a large variety of Earth targets. A careful selection of cloud-free measurements with a large directional coverage lead to about 22,000 sets of measured Bidirectional(More)
—Satellite-derived time series of the fraction of absorbed photosynthetically active radiation (fAPAR) are widely used to monitor vegetation dynamics and to detect vegetation anomalies. Several global data sets are available for this purpose. They are produced using different algorithms and/or satellite sensors. This paper compares and analyzes three(More)
The ESA GLOBCARBON project aims to generate fully calibrated estimates of at-land products quasi-independent of the original Earth Observation source for use in Dynamic Global Vegetation Models, a central component of the IGBP-IHDP-WCRP Global Carbon Cycle Joint Project. The service features global estimates of: burned area, f APAR , LAI and vegetation(More)
The European GMES initiative provides a political framework for future implementation of Service Centres related to environmental applications. The FP7/geoland2 project is the last brick towards the implementation of fully mature GMES Land Services, consisting of Core Mapping Services (CMS) and Core Information Services (CIS). Its goal is to build, validate(More)
Understanding the spatial and temporal variation in carbon fluxes is essential to constrain models that predict climate change. However, our current knowledge of spatial and temporal patterns is uncertain, particularly over land. The European Space Agency (ESA) GLOBCARBON project was initiated to generate fully calibrated estimates of at-land products(More)
The free energy of the Potts model : from the continuous to the first-order transition region. ABSTRACT We present a large q expansion of the 2d q-states Potts model free energies up to order 9 in 1/ √ q. Its analysis leads us to an ansatz which, in the first-order region, incorporates properties inferred from the known critical regime at q = 4, and(More)
The Copernicus Global Land service provides continuously a set of bio-geophysical variables describing, over the whole globe, the vegetation dynamic, the energy budget at the continental surface and some components of the water cycle. These generic products serve numerous applications including agriculture and food security monitoring. The portfolio of the(More)
Geoland2 project is part of the Global Monitoring for Environment and Security (GMES) European-lead initiative intends to prepare, validate and demonstrate pre-operational service chains and products of the Land Monitoring Core Service (LMCS). One of 3 Core Mapping Services (CMS), BioPar is providing in near real-time and off-line biophysical variables(More)
The European GMES (Global Monitoring of the Environment and Security) initiative provides a political framework for future implementations of Service Centers in charge of the provision of products and services related to environmental applications. The GEOLAND project targets the land cover and vegetation thematic area of GMES. The goal of GEOLAND is to(More)