该文研究不同水分胁迫条件下无人机遥感与地面传感器协同估算玉米作物系数的可行性。利用自主研发的六旋翼无人机遥感平台搭载多光谱传感器获取内蒙古达拉特旗昭君镇试验站不同水分胁迫下大田玉米冠层光谱影像,计算植被指数,采用经气象...该文研究不同水分胁迫条件下无人机遥感与地面传感器协同估算玉米作物系数的可行性。利用自主研发的六旋翼无人机遥感平台搭载多光谱传感器获取内蒙古达拉特旗昭君镇试验站不同水分胁迫下大田玉米冠层光谱影像,计算植被指数,采用经气象因子和作物覆盖度校正后的FAO-56双作物系数法计算玉米的作物系数,研究作物系数与简单比值植被指数(simple ratio index,SR)、叶面积指数(leaf area index,LAI)和表层土壤含水率(surface soil moisture,SM)的相关关系,结果表明,作物系数与SR、LAI和SM的相关程度与水分胁迫程度有关,但均呈现出显著或极显著的线性关系,说明了基于这些指标建立作物系数估算模型的可能性。利用逐步回归分析方法建立了作物系数的估算模型,其估算模型,修正的决定系数、均方根误差和归一化的均方根误差分别为0.63、0.21、25.16%。经验证,模型决定系数、均方根误差和归一化的均方根误差分别为0.60、0.21、23.35%。研究结果可为利用无人机多光谱遥感平台进行作物系数估算提供技术参考。展开更多
This article focuses on the interpretation of heng dao ＇IN~_ （sometimes translated as ＂the constant dao＂） and its fundamental character in the Laozi. It argues against the prevailing interpretation of dao as an u...This article focuses on the interpretation of heng dao ＇IN~_ （sometimes translated as ＂the constant dao＂） and its fundamental character in the Laozi. It argues against the prevailing interpretation of dao as an unchanging metaphysical substance or reality, and maintains that the fundamental feature of heng dao is both dynamic and eternal. Heng dao is beyond language because of its dynamic character, but the Laozi nevertheless strives to express it in three aspects： 1） its flexibility and adaptability as represented in the metaphor of water; 2） its movement of reversal and return; 3） and in its existential significance as a guide for life. Heng dao can be called the non-objectified dao, which produces law, principle, rule, method, and so on. Looked at in this way, the dynamic character of heng dao can be called non-objective.展开更多
文摘该文研究不同水分胁迫条件下无人机遥感与地面传感器协同估算玉米作物系数的可行性。利用自主研发的六旋翼无人机遥感平台搭载多光谱传感器获取内蒙古达拉特旗昭君镇试验站不同水分胁迫下大田玉米冠层光谱影像,计算植被指数,采用经气象因子和作物覆盖度校正后的FAO-56双作物系数法计算玉米的作物系数,研究作物系数与简单比值植被指数(simple ratio index,SR)、叶面积指数(leaf area index,LAI)和表层土壤含水率(surface soil moisture,SM)的相关关系,结果表明,作物系数与SR、LAI和SM的相关程度与水分胁迫程度有关,但均呈现出显著或极显著的线性关系,说明了基于这些指标建立作物系数估算模型的可能性。利用逐步回归分析方法建立了作物系数的估算模型,其估算模型,修正的决定系数、均方根误差和归一化的均方根误差分别为0.63、0.21、25.16%。经验证,模型决定系数、均方根误差和归一化的均方根误差分别为0.60、0.21、23.35%。研究结果可为利用无人机多光谱遥感平台进行作物系数估算提供技术参考。
文摘This article focuses on the interpretation of heng dao ＇IN~_ （sometimes translated as ＂the constant dao＂） and its fundamental character in the Laozi. It argues against the prevailing interpretation of dao as an unchanging metaphysical substance or reality, and maintains that the fundamental feature of heng dao is both dynamic and eternal. Heng dao is beyond language because of its dynamic character, but the Laozi nevertheless strives to express it in three aspects： 1） its flexibility and adaptability as represented in the metaphor of water; 2） its movement of reversal and return; 3） and in its existential significance as a guide for life. Heng dao can be called the non-objectified dao, which produces law, principle, rule, method, and so on. Looked at in this way, the dynamic character of heng dao can be called non-objective.
