基于数字图像的车辆行驶跑偏在线测量方法     

陈长军  王刚  刘勇  何耀华 《测绘科学》2014,39(9)

保证车辆在正常情况下沿直线行驶是汽车制造的基本要求,汽车制造厂商高度重视车辆行驶跑偏的检测.文章分析了车辆行驶跑偏量测量的一般方法并提出了一种基于数字图像的汽车行驶跑偏检测方法,实现了车辆行驶跑偏量的自动测量.通过实验,验证了该方法的可行性,且具有自动化程度高、效率高、测量精度高以及可靠性强等特点.基于数字图像的车辆行驶跑偏在线测量系统已投入汽车制造公司的实际生产使用.  相似文献   

卫星摄影测量中偏流角修正余差改正技术   总被引：1，自引：1，他引：0  

王建荣  王任享  胡莘 《测绘学报》2014,43(9):954-959

本文基于立体影像摄影机理,对偏流角修正的剩余误差导致的上下视差进行了分析,建立了立体相机偏流角余差改正的数学模型,推导出偏流角余差影响上下视差的误差方程,并重点从相机参数在轨标定和光束法平差中低频误差补偿两方面提出解决措施。理论分析与实际卫星影像试验表明,偏流角改正余差对上下视差影响较大,必须通过相机参数在轨标定和低频误差补偿两方面予以改正,才能保证全球范围无地面控制点目标定位精度的一致性。  相似文献   

Characteristics of Seafloor Morphology and Ferromanganese Nodule Occurrence in the Korea Deep-sea Environmental Study (KODES) Area,NE Equatorial Pacific     

Hoi-Soo Jung  Young-Tak Ko  Sang-Bum Chi  Jai-Woon Moon 《Marine Georesources & Geotechnology》2013,31(3):167-180

Abstract

Seafloor morphology and ferromanganese nodule occurrence were studied using a multibeam side scan sonar (SeaBeam, 2000) and a deep-sea camera system in the Korea Deep-sea Environmental Study (KODES) area, northeast equatorial Pacific. Seafloor morphology and nodule abundance are highly variable even in this small study area. The NNE-SSW oriented hills are parallel and about 100–200 m high. Valleys are very flat-floored, while hilltops are rugged with depressions of tens of meters. Cliffs to about 100 m bound the valleys and the hills. The study area can be classified into three types based both on nodule occurrence and seafloor morphology, mostly G- and B-types and some M-type. G-type is characterized by high nodule abundance, ubiquitous bioturbation, and flat seafloor morphology, while B-type is characterized by irregular-shaped nodules, variable nodule abundance, occurrence of giant nodules and sediment lumps, rugged bottom morphology with depressions, and white calcareous surface sediments. Medium nodule abundance and a generally flat seafloor characterize M-type. G-type occurs mostly in the valley regions, while B-type is on the hilltop areas. M-type is located between the hilltop and the valley. Tectonic movement of the Pacific plate resulted in the elongated abyssal hills and cliffs. The rugged morphology on hilltops resulted from erosion and redistribution of surface siliceous sediments on hilltops by bottom currents, outcropping of underlying calcareous sediments, and dissolution of the carbonate sediments by corrosive bottom water undersaturated with CaCO₃. Sediment eroded from the hills, which is relatively young and organic-rich, is deposited in the valleys, and diagenetic metal supply to manganese nodules in the valley area is more active than on the hills. We suggest that tectonic movement ultimately constrains morphology, surface sediment facies, bottom currents and sediment redistribution, bioturbation, thickness of the sedimentary layer, and other conditions, which are all interrelated and control nodule occurrence. The best potential area for mining in the study area is the G-type valley zones with about 3–4 km width and NNW-SSE orientation.  相似文献   

Predicting the excavation damaged zone within brittle surrounding rock masses of deep underground caverns using a comprehensive approach integrating in situ measurements and numerical analysis     

《地学前缘(英文版)》2022,13(2):101273

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