国产光学卫星影像RPC制作   总被引：2，自引：0，他引：2  

祝小勇  张过  秦绪文 《国土资源遥感》2009,(2):32-34,40

有理函数模型(Rational Polynomial Coefficients,RPC)是一种常用的影像几何关系表达模型,可以用于精确表达所有影像的成像几何关系,正广泛地被业界所接受.本文在国产光学卫星严密成像几何模型基础上,介绍了RPC模型和无偏估计参数求解算法.利用资源一号02B星、资源二号03星数据进行实验的结果证明了方法的正确性以及RPC模型对国产卫星影像的适应性.  相似文献   

一种加窗速度平滑伪距的定位算法     

徐卫明  暴景阳  陆建华 《测绘科学》2009,34(3)

海面传感器网络的跟踪定位受到海浪以及海杂波的影响,难以满足协同观测、协同通信以及协同环境遥感等任务的精度需求,针对这一问题文中提出了加窗径向速度平滑伪距的定位方法(WVSP),并利用MonteCarlo仿真技术分析了该算法应对海杂波和链路测距粗差的定位精度。仿真处理的结果表明:与常用的直接伪距定位法、速度平滑伪距定位法相比较,WVSP能够有效地削弱测距链路中粗差的影响,降低了海杂波的干扰,使定位精度收敛。  相似文献   

坡度测设的两种方法     

单瑞  独知行  张利涛 《测绘工程》2009,18(6):68-70

在道路、管道、地下工程、场地平整等工程施工中，经常需要在地面上测设设计的坡度线。工程测量中已知坡度线的测设大都采用倾斜视线法，考虑到实际施工工作中精度和效率等因素，提出采用扇形视线法测设坡度线，文中对该方法的使用注意事项做详细的介绍。通过实际施工应用，证明扇形视线法具有较高的应用价值。  相似文献   

山东省定点形变倾斜观测异常指标研究   总被引：2，自引：0，他引：2  

王梅  季爱东 《地震研究》2000,23(4):398-404

在研究我省形变台多年观测资料的基础上,提取各台各套仪器的正常变化形态及干扰形态,对山东菏泽５．９级、大同６．１级、南黄海５．３级等地震前的异常特征进行了分析、总结。 结果认为,当各台倾斜仪出现打破以往年变正常规律的形态及γ因子超出二倍中误差时,即可视为异常出现。当趋势异常或γ因子出现转折、大幅度波动时,即可视为进入短期阶段,应注意未来１个月左右地震发生的可能,矢量方向大致指向或背向震中。在进入短期  相似文献   

地应力观测井中元件标定及应力场计算方法   总被引：11，自引：2，他引：9  

石耀霖  范桃园 《地震》2000,20(2):101-106

在地应力长期观测中,对井下现场标定观测元件的布设以及计算应力的相对变化是一个困难的问题。针对这个问题,提出了在钻孔内布设四个应力测量元件,而非传统三个元件的测量方法。在井下其中一个元件大体标定的情况下,对其他元件进行了相对精密标定,并给出了应力变化以及实现应力观测数据可靠性自校的计算公式。  相似文献   

The Z/I Imaging Digital Camera System   总被引：1，自引：0，他引：1  

A. Hinz  & H. Heier 《The Photogrammetric Record》2000,16(96):929-936

Market needs for airborne and spaceborne imagery used in photogrammetry and GIS applications are changing. Fundamental changes in sensors, platforms and applications are currently taking place. Most recently, new high resolution spaceborne sensors have become available. Besides classical photogrammetry, new thematic applications will drive the future image market. Savings in cost and time, together with the need for higher and reproducible radiometric resolution or spectral information will push forward the change from analogue to digital imagery. High resolution satellites will compete with airborne film-based photography and digital camera systems.
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system.  相似文献   

A fluorescent approach to the identification of grout injected into fissures and pore spaces   总被引：6，自引：0，他引：6  

Youqing Chen  Takashi Nishiyama  Michinao Terada  Yoshiaki Iwamoto 《Engineering Geology》2000,56(3-4):395-401

A new fluorescent approach was developed to visualize grouting processes. The evaluation of the effect of grouting is carried out by methods based mainly on physical measurements such as permeability and porosity characteristics. However, these estimates do not necessarily correlate with practical grouting data. In this paper, the distributions of various grout mixtures containing fluorescent substances were clearly visualized under ultraviolet light, using a borehole television system or a microscope. Since this approach enabled direct observation of grout distribution, it is considered that this approach is useful for analysis of grouting mechanisms, designing grout curtains, etc.  相似文献   

倾斜仪观测值中函数项的参数估计和谱分析     

苏瑞源  郑金民  方联鹏  崔金华 《大地测量与地球动力学》1994,(3)

选用十个随时间趋势性变化的函数作为零漂估计函数项，选用一系列不同周期的正、余弦函数作为周期变化的函数项，建立倾斜仪观测值中所含函数项的数学模型，给出了对上述两类函数按统一标准计算及挑选的方法。对漳州地震台ＳＱ－７０Ｂ倾斜仪资料的计算结果显示这一数学模型基本符合实际；周期等于５０天的振幅，与台湾Ｍ２＞５．０级地震和福建省内ＭＬ≤４．０级地震对应较好。  相似文献   

海原、道孚地震前后的区域性倾斜变化特征     

张伯宏  刘天铭 《大地测量与地球动力学》1996,(2)

采用富里叶分析法，对宁夏海原５．７级地震和四川道孚６．９级地震的震区垂直形变场的区域性倾斜信息进行分离和提取。上述地震在孕震期和震后，其区域性倾斜的倾向一致；而发震期的区域性倾斜不同于孕震期和震后，其倾向有一定偏转。  相似文献   

Effects of lime treatment on the geotechnical properties of dredged mud     

Quanbin Jin 《Marine Georesources & Geotechnology》2013,31(9):1083-1094

Abstract

The preloading method has been widely applied in land reclamation as a green and economical approach to ground improvement. To improve the consolidation behavior, the addition of lime generally improves soil performance. In this article, a modified oedometer equipped with a tactile pressure sensor and a bender–extender element is employed. The effects of lime treatment on the geotechnical properties of dredged mud are investigated; these properties include the coefficient of the earth pressure at rest (K₀), settlement, drainage behavior, and evolution of the elastic wave velocity. The results reveal that the addition of lime not only influences the specimen’s deformation behavior but also influences its shear strength during and after loading. Combined with the evolution of the elastic wave velocity, the microstructural evolution of the specimen could be described and explained. It is concluded that a compressional wave is more sensitive to the change in the specimen’s void ratio and saturation. For K₀, initially (<25?kPa), the higher the lime content is, the greater the K₀ fluctuation is. Afterwards, the higher the lime content is, the smaller the K₀ fluctuation is, and finally K₀ slowly approaches approximately 0.2.  相似文献