Vector tiles (z4-14) of 607,488 US field-boundary polygons meeting the validated irrigation definition (LANID >=8 of 24 mapped years 1997-2020, >=10 acres), with per-field attributes: acres, years irrigated, persistence score, mapped center-pivot overlap, county/state. Derived from: FTW Global 2024 field boundaries (CC-BY-4.0, Taylor Geospatial and collaborators) · LANID (Xie & Lark, CC-BY-4.0; 2018-2020 extension USGS, public domain) · GCPIS center-pivot polygons (CC0) · US Census Bureau TIGER/Line (public domain). Derived tiles: CC-BY-4.0. Counts are mapped field-boundary polygons, not physical fields, farms, or irrigation machines. Serves uffda.ag's Irrigated fields (BETA) layer.