基于低空无人机遥感技术的油菜机械直播苗期株数识别

发布时间：2018-03-11 22:35

  本文选题：无人机　切入点：遥感　出处：《农业工程学报》2017年19期 　论文类型：期刊论文

【摘要】：植株数量识别是油菜机械直播效果和质量评估的关键。该文针对油菜机械直播田间植株数量检测中人工统计耗时、费工、效率低下的现实,通过自主搭建的低空无人机遥感平台采集油菜机械直播区域的遥感影像,基于超高分辨率(0.18 cm/pixel)遥感影像计算的颜色植被指数进行油菜目标识别及其形态特征信息提取。结合田间调查数据,采用逐步回归分析方法,建立了机械直播油菜在苗期的株数与遥感特征信息之间的关系。结果显示,油菜目标的株数与其外接矩形的长宽比、像素分布密度和周长栅格数具有较好的线性关系,回归模型的决定系数R~2为0.803,并通过显著性检验,其标准估计误差为0.699。模型检验结果显示,观测值与预测值之间的R~2为0.809,均方根误差RMSE为0.728。研究结果表明,利用集成超高分辨率传感器的低空无人机遥感平台,通过计算颜色植被指数并分析油菜目标数量与形态特征的相关性,能有效识别油菜机械直播的出苗株数,可为后续油菜机械直播效果的快速、准确评估提供技术支持。
[Abstract]:The identification of plant quantity is the key to the evaluation of the effect and quality of direct seeding of rapeseed mechanically. This paper aims at the fact that the manual statistics of the number of plants in the field of direct seeding of rapeseed is time-consuming, laborious and inefficient. Remote sensing images of rapeseed machinery direct seeding area were collected by self-built low altitude UAV remote sensing platform. Based on the color-vegetation index calculated from the super-high resolution 0.18 cm / pixel remote sensing image, rapeseed target recognition and morphological information extraction were carried out, and the stepwise regression analysis method was used to combine the field investigation data. The relationship between the number of plants in seedling stage and remote sensing information was established. The results showed that there was a good linear relationship between the number of plants and the ratio of length to width of the outer rectangle, the distribution density of pixels and the number of girth grids. The determination coefficient of regression model Ru 2 is 0.803, and the standard estimation error is 0.699 through significance test. The results of model test show that the R2 between the observed value and the predicted value is 0.809, and the root mean square error (RMSE) is 0.728. Based on the remote sensing platform of low altitude UAV integrated with ultra-high resolution sensor, by calculating the color vegetation index and analyzing the correlation between the number of rapeseed targets and the morphological characteristics, the number of emergence plants of rapeseed mechanically direct seeding can be effectively identified. It can provide technical support for the rapid and accurate evaluation of the direct seeding effect of rapeseed.
【作者单位】： 华中农业大学资源与环境学院;农业部长江中下游耕地保育重点实验室;华中农业大学工学院;中国科学院测量与地球物理研究所;华中农业大学理学院;
【基金】：国家自然科学基金(41201364,31501222) 中央高校基本科研业务费专项资金资助(2017JC038,2015BQ026,2014QC013)
【分类号】：S233.75;TP751
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本文编号：1600255