Given 10,000 crime incident points and a map of police precincts, which precinct has the most points? That's a spatial join. Step 5: Coordinate Reference Systems (CRS) – The Silent Killer If your layers don't align, you likely have a CRS mismatch.
But if you open a raw shapefile or a GeoJSON file for the first time, you’ll quickly realize: Python GeoSpatial Analysis Essentials
A GeoDataFrame is just a Pandas DataFrame with a special column (usually geometry ) that stores shapely objects. You rarely create geometries by hand, but you must understand them. Given 10,000 crime incident points and a map
Pro tip: Never calculate distance or area using lat/lon (EPSG:4326). Always project to a local or equal-area CRS first. Static maps are fine. Interactive maps impress stakeholders. Python GeoSpatial Analysis Essentials