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Optical Engineering • Open Access

Artificial target detection with a hyperspectral LiDAR over 26-h measurement
Author(s): Eetu Puttonen; Teemu Hakala; Olli Nevalainen; Sanna Kaasalainen; Anssi Krooks; Mika Karjalainen; Kati Anttila

Paper Abstract

Laser scanning systems that simultaneously measure multiple wavelength reflectances integrate the strengths of active spectral imaging and accurate range measuring. The Finnish Geodetic Institute hyperspectral lidar system is one of these. The system was tested in an outdoor experiment for detecting man-made targets from natural ones based on their spectral response. The targets were three camouflage nets with different structures and coloring. Their spectral responses were compared against those of a Silver birch (<italic<Betula pendula</italic<), Scots pine shoots (<italic<Pinus sylvestris</italic< L.), and a goat willow (<italic<Salix caprea</italic<). Responses from an aggregate clay block and a plastic chair were used as man-made comparison targets. The novelty component of the experiment was the 26-h-long measurement that covered both day and night times. The targets were classified with 80.9% overall accuracy in a dataset collected during dark. Reflectances of four wavelengths located around the 700 nm, the so-called red edge, were used as classification features. The addition of spatial aggregation within a 5-cm neighborhood improved the accuracy to 92.3%. Similar results were obtained using a set of four vegetation indices (78.9% and 91.0%, respectively). The temporal variation of vegetation classes was detected to differ from those in man-made classes.

Paper Details

Date Published: 23 January 2015
PDF: 15 pages
Opt. Eng. 54(1) 013105 doi: 10.1117/1.OE.54.1.013105
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Eetu Puttonen, Finnish Geodetic Institute (Finland)
Teemu Hakala, Finnish Geodetic Institute (Finland)
Olli Nevalainen, Finnish Geodetic Institute (Finland)
Sanna Kaasalainen, Finnish Geodetic Institute (Finland)
Anssi Krooks, Finnish Geodetic Institute (Finland)
Mika Karjalainen, Finnish Geodetic Institute (Finland)
Kati Anttila, Finnish Geodetic Institute (Finland)
Finnish Meteorological Institute (Finland)

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