Introduction SoilFieldSpec addresses the limited availability of high-resolution soil information resulting from the high costs and low temporal frequency of conventional soil analysis. The use case focuses on visible and near- infrared spectroscopy (VNIRS) as a rapid, non-destructive, and mobile approach for in situ soil characterization under practical field conditions. Its main objective is the creation of a publicly available library of mobile VNIRS soil spectral data across different soilscapes to support precision agriculture, soil health monitoring, and environmental assessment. Methodologies The use case collects mobile in situ VNIRS measurements acquired directly in agricultural environments under varying field conditions. The collected spectra are linked to reference soil parameters such as soil organic matter (SOM), soil moisture, pH, texture, and macronutrients. In contrast to existing laboratory-based spectral libraries relying on pre-treated soil samples, SoilFieldSpec focuses on field-based measurements and the development of calibration approaches suitable for practical applications. The collected data supports the development of site-independent calibration models at farm and regional scales and enables benchmarking of mobile VNIRS systems against other soil mapping approaches. Output • VNIRS data publication: Public release of mobile in situ VNIRS field spectral data from soils in East Brandenburg (Germany). • SoilFieldSpec library: Collection and publication of mobile in situ VNIRS datasets from soils across different regions worldwide. • VNIRS calibration models: Development of site-independent calibration models for SOM, soil moisture, pH, and macronutrients at farm and regional levels. Impact The use case contributes to improving the spatial and temporal resolution of soil monitoring through affordable and rapid field-based measurements. By enabling real-time assessment of soil properties directly under field conditions, SoilFieldSpec supports precision agriculture, soil management decisions, and broader access to soil information for researchers, advisors, authorities, and farmers. What I Can Offer • Mobile in situ VNIRS datasets acquired under practical field conditions. • Publicly available soil spectral datasets and calibration resources. • Experience with field-based soil sensing and site-independent calibration approaches. • Benchmarking opportunities for evaluating mobile soil sensing technologies. What I Need • Collaboration on calibration modelling and spectral data processing. • Exchange on benchmarking methodologies and validation strategies. • Approaches for harmonizing and integrating heterogeneous soil spectral datasets. • Cooperation with related initiatives in soil sensing, precision agriculture, and environmental monitoring

Source: Annual AgData Use Case Summit 2026 booklet.