Filter Variants: Optimization metrics and filtered station observations for winter wheat (Triticum aestivum, DWD Plant ID 202) in Germany

This dataset provides two complementary outputs of the PhenoPhaseR processing pipeline (https://doi.org/10.5281/zenodo.18743008) forwinter wheat (Triticum aestivum L., DWD Plant ID 202), covering all observed phenological phases (sowing to harvest) for the entire territory of Germany for the period 1993–2024. PhenoPhaseR is an open-source R workflow that couples the PHASE model - a growing-degree-day (GDD) approach with adaptive outlier filtering - to derive spatially consistent, quality-controlled point observations of phenological phase-start dates from the DWD volunteer observer network. The dataset components provided here correspond to processing Steps 5–6 (filter variant optimization) of the seven-step pipeline.