Infrared balloon image reveals Gowanus plume
Two photos (one visible, one near-infrared) taken by balloon aerial rig on Sunday July 31 were composited to reveal this plume.
Original visible image in MapMill:
Original near-infrared image in MapMill:
The video tutorial on how to composite images like this is linked from the Near-Infrared Camera Tool page - scroll down to find it.
These images were collected by the GLAM crew in partnership with the Gowanus Canal Conservancy, and with canoes contributed by the Gowanus Dredgers Canoe Club.