Geocoding Basics

1. Geocoding Basics

2. Geocoding Basics • Getting Started • Understanding the theory • Create Address Locator • Geocode • Introduction to more advanced methods

3. Geocoding Basics What is geocoding? • Definition – The process of converting an address to a specific point location on a map. Gathering data • Streets (Reference data) • Table of student information (Address table)

4. 75 300 NEW YORK 399 N 301 398 ST Geocoding Basics Matching and Scoring Address Components Address 380 New York Street Reference theme Score LeftFrom LeftTo RightFrom RightTo StreetName Type SufDir Missingcomponent results in lower match score

5. Geocoding Basics The Geocoding Process • Create a new address locator • Geocode addresses in a table • Rematch addressees interactively

6. Geocoding Basics Create a New Address Locator • An address locator converts textual descriptions of locations into geographic features. • Created in ArcTool Box

7. Geocoding Basics Create Address Locator • Choose an address style • Pick a primary reference table • Modify address locator properties • Set a 30 foot side offset and 3% end offset!!

8. Geocoding Basics Geocode Addresses: • Geocode in ArcMap • Choose an address locator • Specify the fields to use in the student address table • Name the output feature class • Begin geocoding

9. Geocoding Basics Rematch Addressees Interactively • Open ArcMap to review addresses geographically. Can also rematch in ArcCatalog. • Start editing • Modify and select candidates • No need to save map document!!

10. Geocoding Basics Interactive Review Dialog Window

11. 75 300 NEW YORK 399 N 301 398 ST Geocoding Basics Matching and Scoring Address Components Address (ArcView interprets as) 380 House number New York Street name Street Street type Reference theme Score LeftFrom LeftTo RightFrom RightTo StreetName Type SufDir Missing component results in lower match score