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Unmanned Aerial Vehicle (UAV) operated spectral camera system for forest and agriculture applications

机译：适用于森林和农业应用的无人机（UAV）操作光谱相机系统

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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 × 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 × 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.
机译：芬兰VTT技术研究中心开发了一种基于法布里-珀罗干涉仪（FPI）的高光谱成像仪，可与轻型无人机平台兼容。高光谱成像仪的概念已在SPIE Proc中发布。 7474和7668。在森林和农业应用中，多数情况下在几个波段记录多光谱图像就足够了。计算森林面积和农田的数字高程模型的可能性提供了估算生物量和进行森林清查的手段。完整的UAS多光谱成像系统将包括高分辨率的伪彩色成像仪和基于FPI的高光谱成像仪，可在VGA（480×640像素），最高5 Mpix的分辨率下，在用户可选光谱的波长范围内（500-900 nm）使用分辨率在10…40 nm @ FWHM范围内。分辨率取决于使用Fabry-Perot干涉仪的顺序。伪彩色相机的连续图像之间的重叠率为70…80％，这使得可以计算目标区域的数字高程模型。假彩色相机的视场通常为80度，飞行高度为150 m时地面像素大小约为5 cm。目前，高光谱成像仪的视场为26×36度，飞行高度为150 m时地面像素大小约为3.5 cm。 UAS系统已于2011年夏季在芬兰南部的森林和农业地区试用。在第一次测试活动中，伪彩色相机和高光谱成像仪分别飞过目标区域。简短说明高光谱成像仪的设计和校准。本文还介绍了针对森林和农作物田地的试飞活动及其初步结果。

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