This unwieldy-looking device (TM) is a sort-of home made Landsat satellite. It doesn't provide images, but it does collect light in the same parts of the spectrum as Landsat does. Here volcanologists are collecting a spectrum of a patch of 1968 phreatomagmatic ash. The device sits out on the end of an aluminum bar, counter-balanced by a backpack. Spectra are alternately collected of the ground and of a gray card standard (C) for calibration.

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