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GlobCover

Olivier Arino(1), Frank Ranera(2), Patrice Bicheron(3), Marc Leroy(3), Carsten Brockman(4), Pierre Defourny(5), Christelle Vancutsem(5), Leon Shouten(6), Frederic Achard(7), Hugh Eva(7), Hans Jurgen Stiebig(7), Jean Louis Weber(8), Andrus Mainer(8), John Latham(9), Antonio Di Gregorio(9), Ron Witt(10), Jaap Van Woerden(10), Christiana Schmullius(11), Martin Herold(11), Stephen Plummer(12), Ludovic Bourg(13), Federico Gonzalez-Alonso(14), Nigel Houghton(1) and Philippe Goryl(1)

(1) ESA, via Galileo Galilei, 00044 Frascati, Italy
(2) Serco, via Galileo Galilei, 00044 Frascati, Italy
(3) Medias-France, Parc Technologique du Canal, Toulouse, France
(4) Brockman Consult, Geesthacht, Geesthacht, Germany
(5) UCL, Louvain-La-Neuve, Louvain-La-Neuve, Belgium
(6) Microsoft, Waggeningen, Waggeningen, Netherlands
(7) JRC, Ispra, Ispra, Italy
(8) EEA, Copenhagen, Copenhagen, Denmark
(9) FAO, Rome, Rome, Italy
(10) UNEP, Geneve, Geneve, Switzerland
(11) U. Jena, Jena, Jena, Germany
(12) IGBP, Stockhom, Stokholm, Sweden
(13) ACRI, Sophia-Antipolis, Sophia-Antipolis, France
(14) INIA, Madrid, Madrid, Spain

Abstract

The GLOBCOVER project developed a service which produceed a 300 m global land-cover map for the period May 2005-April 2006, using its main source FRS (full resolution (300m) full swath) data acquired over the full year 2005-2006 by the MERIS sensor on-board ENVISAT. The overall system contains 3 pillars: pre-processing, classification and production. The pre-processing includes the following steps: geometric correction, cloud screening, atmospheric correction, angular correction.

A global stratification was completed to split the world into equal-reasoning regions from bioclimatic, ecological and satellite observation conditions points of view. This is the cornerstone for the regional tuning applied for all the consecutive classification steps as each region has been processed separately and mosaic into a single file afterwards. Then, the labelling step merged and transformed the spectro-temporal classes into 22 land cover classes and 1 class "no data" defined by the Land Cover Classification System (LCCS) of the FAO.

6 bimonthy and 1 yearly global composites (version 1) are already available on the ESA web site www.esa.int/ionia/globcover. A land cover version 1 has been delivered in February 2008 and evaluated in March 2008 during the Second End Users Meeting held in FAO. In the same time, a version 2 of bimonthly composites taking into account algorithmic improvements (geolocation update, new aerosol climatology, integration of snow and flooded areas masks) is currently produced over the complete period of MERIS FRS acquisition (December 2004-June 2006). This new delivery used to generate a second validated version of the Globcover Land Cover map in Junly 2008 wil be discussed during the workshop.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry