Notes on location data, geospatial analysis, real estate research, and building SkaldMaps.https://skaldmaps.com/en-ushttps://skaldmaps.com/blog/2026/07/zip-codes-are-a-bad-spatial-abstraction/https://skaldmaps.com/blog/2026/07/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.Tue, 14 Jul 2026 00:00:00 GMThttps://skaldmaps.com/blog/2026/06/building-confidence-in-geospatial-data/https://skaldmaps.com/blog/2026/06/building-confidence-in-geospatial-data/How SkaldMaps generates a confidence score for data attributes that helps you gauge how accurate data is (or isn't).Tue, 09 Jun 2026 00:00:00 GMT