We’re on the bus now heading back from New York City to Washington DC after an eventful week (read about the $575k Knight awarded Development Seed for OpenStreetMap work on the MapBox blog).

Here are some pictures of the OpenStreetMap intro workshop Ian and I held yesterday at foursquare’s headquarter’s. Thanks to the NYC OSM community leads Liz, Serge and Eric for the initiative and promotion.

Thanks to David Blackman of foursquare for kindly offering foursquare’s great digs in Manhattan for this workshop. Join the OSM NYC Meetup Group if you’d like to stay in the loop on all things mapping NYC.

A great crowd of about 30 people turned out for the workshop.

Kicking off with examples of the many ways of how OpenStreetMap data can be used.

We quickly went hands-on and started editing and improving data on OpenStreetMap using JOSM.

Ian showing how to build quick OpenStreetMap based maps using Migurski’s shapefile extracts and TileMill

Liz Barry explains how DIY aerial imagery can be used in OpenStreetMap

And yeah, the view from foursquare’s office is killer