This dataset contains the data additional data provided for the SPATIAL SCALING CHALLENGE organized in the framework of the SENSECO COST Action CA17143 “Optical synergies for spatiotemporal SENsing of Scalable ECOphysiological traits” (https://www.senseco.eu/), by the Working Group 1. “Closing the scaling gap: from leaf measurements to satellite images” (https://www.senseco.eu/working-groups/wg1-scaling-gap/). The main dataset, documentation and scripts of the SPATIAL SCALING CHALLENGE must be downloaded from: https://doi.org/10.5281/zenodo.6451335 This additional dataset includes half-hourly time series of down-welling incoming spectral irradiance (W m-2 µm-1) in the visible and near-infrared domains as measured by a field spectroradiometer operating in a nearby ecosystem station. The inclusion of these data in the Spatial Scaling Challenge is at the discretion of the participants. The SPATIAL SCALING CHALLENGE aims at gathering the community’s expertise and knowledge to tackle the scaling problems posed by variables of different nature. These experiences will be summarized in a journal article where all the participants are invited to contribute. The exercise is internationally open. Ph.D. students, early career and senior researchers, spin-offs, and companies working in the field of remote sensing of vegetation ecophysiology are welcome to participate. STILL OPEN FOR PARTICIPATION! New deadline 31st of October 2022. Follow all the communications and updates of the SPATIAL SCALING CHALLENGE in the RG site: https://www.researchgate.net/project/Spatial-Scaling-Challenge-COST-Action-CA17134-SENSECO-Working-Group-1.