Materials required to reproduce the analysis reported in the paper. Dec 17, 2025 Addition: The final IrrMapper training dataset from which points were extracted, Earth Engine raster information was exported, training tables built, and raster inference executed using https://github.com/dgketchum/EEMapper. Each land type has a shapefile (uncultivated, dryland agriculture, irrigated agriculture with year of irrigation, and wetlands), each of which has tens of thousands of polygons, providing a land cover estimate over hundreds of thousands of square kilometers. Notes: There are shapefiles for 'dryland' (unirrigated crops) and 'fallow' (equipped but not irrigated for the year in the attribute table). We combine these into a single, unirrigated crops class for IrrMapper. Projection: North_America_Albers_Equal_Area_ConicPropertiesUnits: metersStatic (relies on a datum which is plate-fixed)Celestial body: EarthMethod: Albers Equal AreaWKTPROJCRS["North_America_Albers_Equal_Area_Conic", BASEGEOGCRS["NAD83", DATUM["North American Datum 1983", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["Degree",0.0174532925199433]]], CONVERSION["North_America_Albers_Equal_Area_Conic", METHOD["Albers Equal Area", ID["EPSG",9822]], PARAMETER["Latitude of false origin",40, ANGLEUNIT["Degree",0.0174532925199433], ID["EPSG",8821]], PARAMETER["Longitude of false origin",-96, ANGLEUNIT["Degree",0.0174532925199433], ID["EPSG",8822]], PARAMETER["Latitude of 1st standard parallel",20, ANGLEUNIT["Degree",0.0174532925199433], ID["EPSG",8823]], PARAMETER["Latitude of 2nd standard parallel",60, ANGLEUNIT["Degree",0.0174532925199433], ID["EPSG",8824]], PARAMETER["Easting at false origin",0, LENGTHUNIT["metre",1], ID["EPSG",8826]], PARAMETER["Northing at false origin",0, LENGTHUNIT["metre",1], ID["EPSG",8827]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Not known."], AREA["North America - onshore and offshore: Canada - Alberta; British Columbia; Manitoba; New Brunswick; Newfoundland and Labrador; Northwest Territories; Nova Scotia; Nunavut; Ontario; Prince Edward Island; Quebec; Saskatchewan; Yukon. United States (USA) - Alabama; Alaska (mainland); Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming."], BBOX[23.81,-172.54,86.46,-47.74]], ID["ESRI",102008]]Proj4+proj=aea +lat_0=40 +lon_0=-96 +lat_1=20 +lat_2=60 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defsExtent-172.54, 23.81, -47.74, 86.46