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Evolution of network orientation procedures
close-range photogrammetry automation image orientation collinearity projective geometry computer vision
2015/8/24
This paper discusses the evolution of algorithms and procedures for network orientation that have accompanied the transition of close-range photogrammetry from a film-based to a digital image-based me...
New strategies for integrating photogrammetric and GNSS data
Photogrammetry Adjustment Estimation GNSS Aerial Multi-sensor
2015/8/24
GNSS-controlled photogrammetry is a mature technology that has found near universal acceptance in the aerial mapping community.The current strategy for integrating photogrammetric and GNSS data is to ...
Photogrammetry for digital hand surface capture in swimming performance study
Crawl swimming replica hand stereo-photography underwater photography
2015/8/24
The paper describes an application of close-range photogrammetry in the study of the human hand for propulsion in competitive swimming. The study involved the capture of 3-D surface data and modelling...
Naming Countermeasures of Administrative Division in Sight of Chinese Naming View
Place name Chinese administrative division name naming principle naming countermeasure
2015/7/27
Although some progresses have been made after nearly 30 years of research and practice of administrative division renaming in China, there are still many problems which have not been really resolved. ...
USE OF MOBILE DEVICES FOR E-LEARNING IN GEOMATICS
e-learning mobile devices student learning
2015/6/17
For the last 4 years, the School of Civil Engineering & Geosciences at Newcastle University, UK adapted mobile devices as learning
approach only for undergraduate within Geomatics. All incoming stud...
REPRESENTATION OF SKETCH DATA FOR LOCALISATION IN LARGE DATA SETS
Analysis Interpretation Matching
2015/6/1
Sketches are often used by humans to quickly give information about places or illustrate how to find a way from A to B. Thus,
sketches are an interesting technique of generating queries with the goa...
The most commonly used method for satellite cloud top height (CTH) compares brightness temperature of the cloud with the atmospheric temperature profile. Because of the uncertainties of this method,...
传统基于子视相干的检测算法,如2L-IHP(Two Looks Internal Hermitian Product)和Pol-IHP(Polarimetric Internal Hermitian Product)等,通常利用两个子视影像进行相干来检测海面弱小船只目标.但受子视影像个数的限制,无法大幅度地提高船海对比度,进而影响了检测精度.针对该问题,本文提出了一种基于全极化SAR的广义多子视相...
为实现对海水声速快速、高精度的测量，采用一种系统结构简单的声速测量方案。通过连续波信号参数估计的方法实现了对声传播时间和声速值的测量。采用伪随机序列对连续波进行调制处理，解决了单频连续波信号在测量中存在的整周期模糊与回波干扰问题。通过构建声速试验平台，进行了系统校准与测量试验。试验结果表明该方法具有测量精度高、响应快速的优点，适合于在水下机动平台上对海洋声速剖面进行快速、高精度的测量。
考虑滑脱效应的欠饱和煤储层渗透率模型
渗透率模型 滑脱效应 有效应力 基质收缩
2014/10/29
在多孔介质应力-应变本构公式基础上，考虑有效应力效应、基质收缩效应、滑脱效应对煤储层渗透率的影响，建立欠饱和煤储层的渗透率动态模型，以沁水盆地某煤层气田为例，模拟储层压力从初始值降至衰竭压力过程中煤储层渗透率变化，分析模型参数敏感性。结果显示：在开发初期，欠饱和煤储层储层渗透率持续下降，储层压力下降至临界解吸压力时，渗透率降至最低点，之后渗透率开始上升；储层压力由初始值下降至临界解吸压力3.80 ...
查明煤层气井排采过程中动水孔隙度的变化规律能为产水量准确预测、排采工作制度合理制定提供依据。借助复变函数理论和弹塑性力学理论，构建了原始状态不同裂隙展布下储层应力分布的数理模型|结合损伤理论、有效应力原理以及结构变形理论，构建了排采过程中应力与结构的损伤动态演化模型|基于水运移平衡条件以及储层孔裂隙展布规律，耦合应力、结构变形损伤作用，构建了单相水流阶段动水孔隙度的数理模型。以沁水盆地樊庄区块为例...
基于拉丝法的线结构光视觉测量系统标定
线结构光视觉测量 特征点 标定 拉丝法
2014/9/18
利用线结构光视觉非接触测量技术的大量程、大视场、高精度、光纹信息提取简单等优点进行非接触测量大型机器及轨道等。分析了线结构光视觉测量传感器数学模型，利用构建的位于光平面上的标定特征点，提出了一种基于拉丝法的线结构光视觉测量标定方法，即先标定传感器相机的内外参数，再利用激光线与铁丝相交形成的点作为特征点标定光平面在相机坐标系下的方程。该方法降低了标定设备的成本，过程简单。标定结果表明：该方法标定满足...
有限元法作为一种高效的数值模拟方法，广泛用于地球物理的正演计算。网格剖分的合适与否是有限元求解的先决条件。在满足剖分区域大小一致，且满足边界条件，进行稀疏与加密网格比较的前提下，讨论了二维介质理想模型的网格剖分对大地电磁正演精度的影响。研究表明，在低频阶段，TE 和TM 两种极化模式从整体上看，粗网格比细网格模拟精度高，但是在近地表开始阶段，TM 模式下，粗网格模拟精度不及细网格；整体变化幅度粗网...
四川芦山Ms 7.0级地震灾情快速评估与反思
快速评估 受灾人口 芦山Ms 7.0级地震
2014/3/17
在四川芦山Ms 7.0级地震震后第一时间启动了灾情快速评估,对地震烈度图、受灾人口分布及比例、房屋倒损分布及比例、伤亡人口分布、道路损毁等灾情进行了演进式4次评估。评估过程充分考虑数据的完备性,从数据不完备情况下的初步定性评估到数据较完备情况下的定量评估,并将第4次评估结果与2013年4月23日民政部公布数据相比:受灾人口评估准确度为95%、房屋倒损评估准确度为73.3%。继玉树地震灾情评估之后,...
THE ACCURACY ANALYSIS OF LIDAR-DERIVED ELEVATION DATA FOR THE GEOMETRIC DESCRIPTION OF CROSS-SECTIONS OF A RIVERBED
DEM/DTM LIDAR Floods Hydrology Hazards
2014/4/24
The work stems from a joint study between the Laboratory ASTRO (Department of Civil and Industrial Engineering - University of
Pisa), the municipality of Pisa and the province of Arezzo on the advan...