Geocoding & Addresses
Address text is data too — and it is the messiest data in the file.
A geocoder always returns something. That is the problem: a coordinate comes back for a misspelled street, a demolished building and a town in the wrong country, and nothing in the response says which. These guides cover what a geocoder actually does, how to clean and parse addresses before you send them, how to read a match score and a precision level, how to batch thousands of lookups without being blocked, and how to check the results against a boundary you already trust before they become dots on a map.
Two thirds of this path is about the address rather than the coordinate, which is the right proportion. Parsing and normalising before you send anything is what lifts a match rate; reading the quality field afterwards is what tells you whether the coordinates you got back can be joined on at all.
Start here
The cornerstone guide — the whole workflow end to end. Everything after it goes deeper into one part of it.
Step 1 Geocoding Explained: From an Address String to a Coordinate geocoding addresses explained Begin the path →The full path, in order
The concepts underneath the work, then each task, then the errors that task produces. Work down, or jump to the step you need.
- The Address Data Model: Why an Address Is Not a String address data model 🧭 Concept
- How to Parse and Normalise Addresses in Python parse addresses python ⚙️ How-To
- Choosing a Geocoder: Coverage, Licence and Cost Compared choosing a geocoder 🧭 Concept
- How to Geocode with Nominatim from Python Without Being Blocked nominatim python geocode ⚙️ How-To
- Match Quality Explained: Reading a Geocoder's Confidence Score geocoder match quality 🧭 Concept
- Rooftop, Interpolated or Centroid: Geocoding Precision Levels geocoding precision levels 🧭 Concept
- How to Batch Geocode Thousands of Addresses in Python batch geocode addresses python ⚙️ How-To
- How to Cache Geocoding Results So a Rerun Costs Nothing cache geocoding results ⚙️ How-To
- How to Validate Geocoding Results Before You Trust Them validate geocoding results ⚙️ How-To
- How to Reverse Geocode Points to Addresses and Areas in Python reverse geocode python ⚙️ How-To
- Address Matching Explained: Why Exact String Equality Fails address matching explained 🧭 Concept
- How to Match Addresses Against a Reference File in Python match addresses reference file ⚙️ How-To
- How to Deduplicate an Address List in Python deduplicate addresses python ⚙️ How-To
- How to Build an Offline Geocoder from Open Address Data offline geocoder python ⚙️ How-To
- My Geocoder Returns No Match for Addresses That Exist geocoder returns no match 🔧 Fix
- Fixing 429 Too Many Requests When Geocoding geocoding 429 rate limit 🔧 Fix
- Fixing Geocodes That All Land in the Country Centroid geocodes country centroid 🔧 Fix
- Fixing Addresses That Break on Accents and Encoding address encoding accents 🔧 Fix
- Fixing a Geocoder That Matches the Wrong Town geocoder wrong town 🔧 Fix
Topics this path covers
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