Builds municipal G-CHAM data packs from 2020 Census 250 m mesh statistics and Japanese administrative boundaries.
G-CHAM Data Pack Builder automates the creation of municipal FlatGeobuf data packs for GIS-based Community Health Assessment Methods (G-CHAM). It downloads six 2020 Population Census 250 m mesh tables from e-Stat and 2026 N03 administrative boundaries from the National Land Numerical Information service, joins selected attributes by KEY_CODE, handles suppressed and aggregated meshes, calculates age-group percentages, assigns intact meshes to municipalities by mesh-center location, and writes styled FlatGeobuf layers. Unlike general Japanese mesh readers, this plugin automates source download, multi-table integration, the G-CHAM field preset, suppression handling, administrative-boundary preparation, municipal allocation, CRS conversion, and municipality-specific outputs in one workflow.
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