Surface bidirectional reflectance distribution function observed at global scale by

Abstract. The spaceborne POLDER instrument presents the unique capability of sampling the surface Bidirectional Reflectance Distribution Function (BRDF) up to about 60 viewing angle for the full azimuth range of every point on Earth at 6 km resolution, when atmospheric conditions are favorable. This paper presents examples of BRDF signa-tures acquired at this resolution on several terrestrial biomes (desert, steppe, grassland, boreal forest, savanna, wetland). Well identied directional signatures for all azimuths are obtained and shown to be dierent for each biome. Specic directional eects in the hot spot and specular directions are well observed in the data