The New York / New Jersey metropolitan region is home to several projects with many partering groups and individuals.

Gowanus Canal Mapping

New York City is home to "Grassroots Mapping Gowanus" which is conducting a monitoring project of the Gowanus Canal cleanup. The is conducting environmental investigations in the Gowanus Canal sub-watershed using balloon mapping to capture aerial imagery. We are also flying a stereo camera rig to collect infrared imagery for more in-depth documentation.

We are also using a stereo camera rig for collecting infrared imagery which can reveal patterns/concentrations of vegetation or possible contaminants.

Another regional project is Grassroots Newark, focused on development and community issues on both sides of the Passaic River:
http://grassrootsnewark.wordpress.com/

The New School Geo Club is a newly formed student group that has been active mapping occupation patterns in Washington Square Park among other sites.

See pictures from a recent workshop held at Union Square with Parsons and Lang at The New School:
http://grassrootsmapping.org/search/parsons