Abstract
This article describes the adaptation of an existing aerial hyperspectral imaging system in a low-cost setup for collecting hyperspectral data in laboratory and field environment and spatial distortion assessments. The imaging spectrometer system consists of an ImSpector V9 hyperspectral pushbroom scanner, PixelFly high performance digital CCD camera, and a subsystem for navigation, position determination and orientation of the system in space, a sensor bracket and control system. The main objective of the paper is to present the system, with all its limitations, and a spatial calibration method. The results of spatial calibration and calculation of modulation transfer function (MTF) are reported along with examples of images collected and potential uses in agronomy. The distortion value rises drastically at the edges of the image in the near-infrared segment, while the results of MTF calculation showed that the image sharpness was equal for the bands from the visible part of the spectrum, and approached Nyquist’s theory of digitalization. In the near-infrared part of the spectrum, the MTF values showed a less sharp decrease in comparison with the visible part. Preliminary image acquisition indicates that this hyperspectral system has potential in agronomic applications.
Highlights
Typical commercial spectrometers or spectrophotometers are usually able to measure the optical spectrum of a specified surface area from a stationary point [1,2,3]
The focus was on the overall results of the reviewed system introduced in this article with all its elements: the hyperspectral imaging system design (HSLS V9), sensor bracket, control system, program codes for creating the hyperspectral cube, spatial calibration, and modulation transfer function (MTF) calculation of the hyperspectral line scanner
We provide the results of MTF calculations, spatial calibration results in laboratory conditions, and an example of hyperspectral surveys in the field, to demonstrate the use of the HSLS V9 as presented
Summary
Typical commercial spectrometers or spectrophotometers are usually able to measure the optical spectrum of a specified surface area from a stationary point [1,2,3]. This is done either with one detector scanning the spectrum in narrow wavelength bands, or with an array detector, in which case all the spectral components are acquired at once [4,5]. Stands and tripods for laboratory imaging of small objects or calibration of sensors are usually used as moving platforms [9,10]. The potential for using similar hyperspectral sensors is huge, and examples can be found in geological analyses [11], analyses of ceramics and other archaeological artefacts [12,13,14,15,16], deep spectral analyses of works of art [17,18,19], environmental protection [20,21,22], precise agriculture [23,24], the pharmaceutical industry [25,26], medicine [27,28], construction [29] and many other branches of human activity
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