VTT Technical Research Centre of Finland has developed a Fabry-Perot Interferometer (FPI) based hyperspectral imager
compatible with the light weight UAV platforms. The concept of the hyperspectral imager has been published in the
SPIE Proc. 7474 and 7668. In forest and agriculture applications the recording of multispectral images at a few
wavelength bands is in most cases adequate. The possibility to calculate a digital elevation model of the forest area and
crop fields provides means to estimate the biomass and perform forest inventory. The full UAS multispectral
imaging system will consist of a high resolution false color imager and a FPI based hyperspectral imager which can be
used at resolutions from VGA (480 x 640 pixels) up to 5 Mpix at wavelength range 500 - 900 nm at user selectable
spectral resolutions in the range 10...40 nm @ FWHM. The resolution is determined by the order at which the Fabry-
Perot interferometer is used. The overlap between successive images of the false color camera is 70...80% which makes
it possible to calculate the digital elevation model of the target area. The field of view of the false color camera is
typically 80 degrees and the ground pixel size at 150 m flying altitude is around 5 cm. The field of view of the
hyperspectral imager is presently is 26 x 36 degrees and ground pixel size at 150 m flying altitude is around 3.5 cm. The
UAS system has been tried in summer 2011 in Southern Finland for the forest and agricultural areas. During the first test
campaigns the false color camera and hyperspectral imager were flown over the target areas at separate flights. The design and calibration of the hyperspectral imager will be shortly explained. The test flight campaigns on forest and crop fields and their preliminary results are also presented in this paper.
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