SYNTHETIC TEACHING DATA — NOT REAL COMMUNES OR STATISTICS. Created for this course upgrade, CC BY-SA 4.0. GeoJSON: WGS84 longitude, latitude. Import CSV X=longitude, Y=latitude, EPSG:4326. Six invented rectangular units near Kampong Chhnang; no relationship to actual boundaries. Population: invented counts; rain_mm: invented observations; coverage_YEAR: invented household water coverage percentages, 0–100; null: missing, never zero. Reproject polygons to EPSG:32648 and calculate area_km2 before density. The browser map is schematic.