In a series of ice collapses, Fox Glacier retreated by around 300 m between January 2014 and January 2015. As the glacier has thinned over the last few years it has destabilised the side of the valley and you can watch the hillside collapse day by day. Before the first collapse you can see guided groups walking on tracks on the ice, and the whole time people watch from a safe view point (bottom right). This timelapse video is made from (mostly) daily images of the glacier.
These images were taken by Victoria University of Wellington with the support of Fox Glacier Guides, Department of Conservation, Snowgrass Solutions, University of Canterbury and the Marsden Fund.
The camera system used to take these images consists of a Raspberry Pi (raspberrypi.org), a low cost credit-card sized computer, controlled by an Arduino (arduino.cc/), an open-source electronics platform. The arduino acts as a GPS-synchronised timer, booting up the raspberry every hour and passing the time through the serial port. The raspberry uses the gphoto2 library to capture the image (on a Nikon D5100 camera), and the photos are uploaded to the internet through a wireless telemetry system. The first camera system, installed in November 2013, has taken 14 photos a day for more than 2 and a half year without fail (and without any maintenance!).