Introducing Quattroshapes, the Global Polygon Gazetteer

A session at State of the Map US 2013

Sunday 9th June, 2013

2:30pm to 3:00pm (PST)

Foursquare needs quality place data to power its geocoding engine to ensure the best recommendations. When someone searches for best coffee in Brooklyn, a simple venue to place point or venue to place bounding box search can result in venues in Manhattan and Jersey City overwhelming the results for Brooklyn. To improve recommendations, they’ve created an authoritative source of polygons around a curated list of places. This gazetteer of non-overlapping polygons provides more relevant results than simple point geometries.

This work is based on foursquare checkins, geocoded photos from Flickr, and an extended version of Natural Earth. The quattroshapes technique calculates the dominant place ID for a given area based on heterogeneous inputs and supplemented geometries with open government data. The quattroshapes code and resulting polygons are licensed under CC-BY.

Geocoding can be the hardest part about going open source - and geo and reverse geocoding is even harder. Reverse geocoding reports the gazetteer place for a latitude and longitude map location or address string and is useful when source data needs to be normalized. This new polygon gazetteer data is used in TwoFishes, the coarse splitting geocoder (and reverse geocoder) written in scala from David Blackman at foursquare.

About the speakers

This person is speaking at this event.
Nathaniel V. Kelso

Map geek & cartographer @stamen, formerly @washingtonpost, @nationalgeographic. Check out NaturalEarthData.com! Views my own, RT != +1. Redacted: @nvkelso.

This person is speaking at this event.
David Blackman

geo, pois and other things bio from Twitter

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Time 2:30pm3:00pm PST

Date Sun 9th June 2013

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