**Preface to "Remotely Sensed Albedo"**

A regular and timely monitoring of surface albedo from local to global scales is vital for determining the radiation exchanges in the continuum soil–vegetation–atmosphere in the context of a changing climate. The surface albedo is a quantity of particular interest that has been identified as a primary essential climate variable. An accurate assessment of surface albedo is relevant for vast domains, such as climate, agriculture, hydrology, meteorology, glaciology, urbanism, and geology.

Land surface albedo has become a standard deliverable of most space missions. Remote sensing measurements have been proven to have a high potential to provide valuable information regarding the mapping of land surface albedo at various spatial and temporal scales. The role of radiation forcing versus atmosphere forcing requires a thorough knowledge of the surface albedo.

With this Special Issue, we will compile state-of-the-art research that addresses various aspects of land surface albedo: mapping from patch, landscape to continental scales, impact of directional sampling, surface radiation modelling, spectral albedo conversion, satellite data merging, environmental monitoring, criteria for quality and uncertainty assessment, link with land cover and land use classification, data assimilation, thematic applications, satellite missions, field campaigns, ground observation networks, and validation. Review contributions are welcome, as well as papers describing new measurement concepts/sensors.

> **Jean-Louis Roujean, Shunlin Liang, Tao He** *Editors*
