Geocoding Basics

Geocoding Basics

• Getting Started

• Understanding the theory

• Create Address Locator

• Geocode

• Introduction to more advanced methods

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)

Geocoding Basics

Matching and Scoring Address Components

Address 380 New York Street

Reference themeScore LeftFrom LeftTo RightFrom RightTo StreetName Type SufDir

75 N300301 NEW YORK ST398399

Missing component results in lower match score

Geocoding Basics

The Geocoding Process • Create a new address locator

• Geocode addresses in a table

• Rematch addressees interactively

Geocoding Basics

Create a New Address Locator• An address locator

converts textual descriptions of locations into geographic features.

• Created in ArcTool Box

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!!

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

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!!

Geocoding Basics

Interactive Review Dialog Window

Geocoding Basics

Matching and Scoring Address Components

Address (ArcView interprets as)380 House number New York Street nameStreet Street type

Reference themeScore LeftFrom LeftTo RightFrom RightTo StreetName Type SufDir75 N300301 NEW YORK ST398399

Missing component results in lower match score