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首页> 外文期刊>Computers and Electronics in Agriculture >Ultra low-level airborne (ULLA) sensing of crop canopy reflectance: A case study using a CropCircle[trade mark sign] sensor
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Ultra low-level airborne (ULLA) sensing of crop canopy reflectance: A case study using a CropCircle[trade mark sign] sensor

机译：作物冠层反射率的超低空载（ULLA）感测：使用CropCircle [商标]传感器的案例研究

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摘要

Operational airborne and satellite remote sensing in agriculture remains constrained by matching platform availability to suitable daytime weather and illumination conditions, crop development, and availability of ground staff. An ultra low-level aircraft carrying an active NIR/Red CropCircle[trade mark sign] sensor was successfully deployed to record and subsequently map crop vigour via the simple ratio (SR) index over a field of sorghum. Given the logging frequency of [almost equal to]20Hz and the presence of alternate rows of bare soil, the Moircb effect reduced the contrast between crop and bare soil skip-rows. Such effects would not be expected to occur in non-skip-row crops. The ultra low-level airborne (ULLA)-SR map derived from the 20m transect records compared favorably with the SR map derived from a meter-resolution airborne digital multispectral image that was re-sampled to a similar spatial resolution. This case study, involving a CropCircle[trade mark sign] sensor mounted in a low-level aircraft demonstrates another deployment option for users of this class of sensor. Moreover, an ULLA configuration offers the potential for greater flexibility in scheduling compared to airborne imaging, given it can be flown at any sun-angle, under cloud, at night, and may easily be incorporated into aircraft already conducting low-level operations, for example crop dusting and reconnaissance, over agricultural fields.
机译：通过将平台的可用性与适当的白天天气和光照条件，作物的生长以及地勤人员的可用性相匹配，农业的机载和卫星遥感业务仍受到限制。成功地部署了带有有源NIR /红色CropCircle [商标]传感器的超低空飞机，用于记录并随后通过高粱上的简单比率（SR）指数记录作物活力。考虑到测井频率几乎等于20Hz，并且存在交替的裸土行，莫伊布（Moircb）效应降低了作物与裸土跳行之间的对比度。预计在非-行作物中不会发生这种影响。从20m断面记录得出的超低空机载（ULLA）-SR映射与从米分辨率的机载数字多光谱图像获得的SR映射相比具有优势，该SR映射被重新采样为相似的空间分辨率。该案例研究涉及安装在低空飞机上的CropCircle（商标）传感器，为此类传感器的用户展示了另一种部署选项。此外，与机载成像相比，ULLA配置具有更大的调度灵活性，因为它可以在任何太阳角度，云层之下，夜晚飞行，并且可以很容易地合并到已经进行低空运行的飞机中，例如农田上的农作物除尘和侦察。

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