Providing Reference Forest Biomass Data for EO Imagery : A Comparison of Four in-Situ Relascope Measuring Devices In Asturias, Spain

Citizen Science or participatory sensing can help filling in the gaps of in-situ reference forestry data needed to analyze satellite images. In this study, we show that the Relasphone, a biomass measuring application previously developed and tested in boreal forests of Finland and temperate-cold pine forests in Durango, Mexico, can be adapted to pine forests in Asturias, Spain. Relasphone measurements were in good agreement with reference data over 20 plots (R 2 = 0.89 for stem volume) and performed well against 3 traditional relas-cope measuring devices. The results suggest the Relasphone can be easily deployed in other temperate biomes