30/12/2015

Snapsat

 

Create Landsat 8 composites from your browser.

Every day since February 2013, the Landsat 8 satellite has captured about 550 scenes of the Earth, measuring around 180 square kilometers.

Landsat 8 imagery is made up of eleven bands that represent different segments of the electromagnetic spectrum. Whilst three of these bands pick light visible to the human eye, the rest capture invisible wavelengths depicting the presence of aerosols, Near Infrared light (an indicator of plant health), Shortwave Infrared (a highly sensitive indicator of water presences), Cirrus clouds (an indicator for precipitation), and superficial temperatures.

By analyzing bands, it is possible to reveal changes in the Earth's environmental and geographical make up, which can be used to compliment environmental reporting or derive new insights about the natural world.

One tool that can help you utilize Landsat imagery in your work is Snapsat.

Unlike many other tools, that require you to download large composite images and configure the processing tools yourself, Snapsat leverages a browser based user interface that allows you to parse and preview different band combinations with little or no technical experience.

For example, in the following image Snapsat was used to combine two Shortwave Infrared bands, a Near Infrared band, and the band that corresponds to blue visible light. In doing so, Snapsat was able to reveal burn scars left by the 2014 Eastern Cascade Fires in Washington, USA.

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Image: Snapsat

For more information on Snapsat, check out this walkthrough video:

Visit the Snapsat website here.

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