Proximity geo-targeting is just one of the ways to tap user and point-of-interest (POI) location data to target consumers in the physical world. As mobile data management technology becomes more sophisticated, advertisers now have access to more types of contextual data that can be used in conjunction with user location and POI data to target more relevant and specific audiences.

This article dives into the main techniques used by data management platform companies to visualize the world and collect data for creating location-based mobile audiences. These techniques include category observations, heuristics and inferences about a place (known as “tiles”) and the use of exact places.
Fixes and fences
First, let us talk about the basic principles of building an audience segment.
To put it simply, you match a specific user (ID #1234) to a specific place (McDonald’s on Market Street), and you have a segment (fast-food diner).
However, doing this effectively requires accurate, precise, and detailed data about each user and each place, as well as the requisite consents by a consumer to use the data.
You have to understand each user’s various attributes, including past behavior, intended behavior, actions and interactions in the real world, plus application and mobile Web usage.
This data can come from a variety of sources: apps that pass both active and background GPS data via an SDK, browser APIs, the bid-stream in a programmatic ad exchange, carrier cell towers and Wi-Fi.
In addition, an emerging set of providers is also starting to take in beacon data, but this is still nascent.
You also have to understand a user’s series of location “fixes,” meaning the latitude and longitude of a user with a time stamp, and what that location is (i.e. a store, restaurant, or airport). Knowing someone’s coordinates is not relevant if you do not know what that location is.
As fixes enter a database attached to an anonymous ID, it becomes possible to categorize that user’s behavior. You can figure out where she lives and works, the stores she visits and her commuting route.
Over time, as you ingest and parse more data, you can construct reliable and refined profiles from hundreds to thousands of location fixes. The greater the number of location fixes, the higher the confidence-score of a profile.
Making the point
Once a number of location fixes attached to mobile IDs are collected, most vendors construct several different types of segments.
The first are basic geographic segments, meaning city, state, ZIP code and designated market areas.
Next, there are behavioral segments. This is where a string of logic is applied to a set of points-of-interest.
For example, we see an ID at 8 a.m. at Starbucks, 9 a.m. at the elementary school, 10 a.m. at 24 Hour Fitness and she lives in Walnut Creek, CA – thus she belongs in a “stay-at-home parent” segment.
There are also brand-associated segments, consisting of consumers who have visited a particular category (fast food diner) or brand or store (Gap shopper).
Advertisers can also use specific places to construct a custom audience based on a particular behavior.
For example, by geofencing all the relevant