Filter Variants: Optimization metrics and filtered station observations for winter rye (Secale cereale, DWD Plant ID 203) in Germany

Filter-variant optimization outputs of the PhenoPhaseR pipeline for winter rye (Secale cereale L., DWD Plant ID 203), for Germany over 1993–2025. The intermediate station-filtering product: per-phase OPT_* optimisation metrics and the selected filtered station observations (SHP_*). No interpolated raster and no uncertainty layer. Pipeline Steps 5-6. Provenance: generated with PhenoPhaseR (software concept DOI 10.5281/zenodo.18743008). AGROVOC subject anchoring (crop species + family concepts, with Wikidata cross-links) is carried identically in the accompanying RO-Crate's schema:about.