Roselyne Lacaze

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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 quasiindependent 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, fAPAR, LAI and vegetation growth(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)
This study investigates the scientific quality of the first version of global biophysical products (FCover, LAI, FAPAR) developed in the Geoland-2 /BioPar Core Mapping Service, namely GEOV1. These products based on SPOT/VEGETATION data were built on MODIS and CYCLOPES products while reconciling their differences. The quality assessment strategy follows the(More)
Monitoring of terrestrial vegetation from satellites at global and regional scales requires accurate and frequent measurements of surface reflectance. In this context, the POLDER instrument leads a key improvement providing, at high temporal resolution, measurements of the Bi-directional Reflectance Distribution Function corrected for atmospheric effects.(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)