Isabel A. Garcia-Williams, Michael J. Starek, Michael J. Brewer, Jacob Berryhill
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引用次数: 0
摘要
本研究利用配备了多光谱传感器的小型无人机系统来评估各种植被指数(VIs),以了解它们在监测谷物高粱(Sorghum bicolor L.)作物缺铁性萎黄病(IDC)方面的潜力。缺铁萎黄病是一种营养失调症,由于缺铁,植物生长受阻,叶片发黄。该项目的目标是找到检测和监测 IDC 的最佳 VI。在生长季节期间完成了一系列飞行,并使用 "结构-运动 "摄影测量法进行处理,以创建正射影像、红、绿、红边和近红外波长的多光谱反射率图。地面数据收集方法用于分析压力、叶绿素水平和谷物产量,并将其与多光谱图像关联起来,以进行地面控制和精确的作物检查。反射率图和土壤去除后的反射率图用于计算 25 个 VI,然后使用两类距离测量法计算其可分离性,以确定代表 IDC 和健康植被的像素之间的最大分离度。利用实地获取的数据得出结论,在整个数据集和各个 IDC 级别(低度、中度和重度)上,哪些 VI 达到了最佳效果。得出的结论是,MERIS 陆地叶绿素指数、归一化红边差异指数和归一化绿色(NG)指数在 IDC 植物和健康植被之间的分离度最高,其中 NG 指数在包含土壤和去除土壤的 VIs 中的分离度最高。
UAS-based multispectral imaging for detecting iron chlorosis in grain sorghum
This study uses a small unmanned aircraft system equipped with a multispectral sensor to assess various vegetation indices (VIs) for their potential to monitor iron deficiency chlorosis (IDC) in a grain sorghum (Sorghum bicolor L.) crop. IDC is a nutritional disorder that stunts a plants’ growth and causes its leaves to yellow due to an iron deficit. The objective of this project is to find the best VI to detect and monitor IDC. A series of flights were completed over the course of the growing season and processed using Structure-from-Motion photogrammetry to create orthorectified, multispectral reflectance maps in the red, green, red-edge, and near-infrared wavelengths. Ground data collection methods were used to analyze stress, chlorophyll levels, and grain yield, correlating them to the multispectral imagery for ground control and precise crop examination. The reflectance maps and soil-removed reflectance maps were used to calculate 25 VIs whose separability was then calculated using a two-class distance measure, determining which contained the largest separation between the pixels representing IDC and healthy vegetation. The field-acquired data were used to conclude which VIs achieved the best results for the dataset as a whole and at each level of IDC (low, moderate, and severe). It was concluded that the MERIS terrestrial chlorophyll index, normalized difference red-edge, and normalized green (NG) indices achieved the highest amount of separation between plants with IDC and healthy vegetation, with the NG reaching the highest levels of separability for both soil-included and soil-removed VIs.