Several groups are using PLOTS tools in the NYC area, including students at Parsons, Pratt and Columbia. Some are using <a href="/tools/grassroots-mapping">balloon mapping</a> to document at-risk ecological sites. 

More updates soon, but for now take a look at Grassroots Newark:

http://grassrootsnewark.wordpress.com/

As well as a recent workshop held at Union Square:

http://grassrootsmapping.org/search/parsons

(photo CC <a href="https://www.flickr.com/photos/j-who/">Jen Hudon</a>)