Tag

sql

SkaldMaps articles tagged with "sql", covering practical location data, geospatial analysis, and product notes.

2026-07-14 ZIP codes are a bad spatial abstraction ZIP codes are delivery routes, not polygons. See how SkaldMaps combines ACS and other sources using ZCTAs, HUD-USPS crosswalks, spatial joins, and DuckDB. engineeringgeospatialdata engineeringduckdbsqlzipzctacensus