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Towards optimizing hierarchical data revisions
Towards optimizing hierarchical data revisions
2016/5/23
The revision of existing data must always be considered when new data are collected which have known relations with the old data, thereby taking into account that the two datasheets in question may be...
The scheme for the database building and updating of 1:10000 Digital Elevation Models
Geospatial data DEM Photogrammetric sampling Cartographic digitisation Specification
2016/5/20
The National Bureau of Surveying & Mapping of China has planned to speed up its development of spatial data infrastructure (SDI) in the coming few years. This SDI consists of four types of digital pro...
Potential of an airborne laser scanner system for change detection of urban features and orthoimage development
airborne laser scanner system change detection orthoimage development
2016/5/20
The Kobe earthquake in 1995 demonstrated an urgent need of developing a change detection mapping system of buildings with high temporal accuracy to save people from damaged buildings. An airborne lase...
Quality assurance for 2.5-D building data of the ATKIS DLM 25/2
Quality assurance 2.5-D building ATKIS DLM 25/2
2016/5/20
The survey administrations of the federal states in Germany are currently building up the basic geoinformation system ATKIS. Data collection for the first realization stage of the DLM 25 (Digital Land...
High resolution sensor test comparison with SPOT, KFA 1000, KVR1000, IRC-1C and DPA in Lower Saxony
High resolution sensor test comparison SPOT Lower Saxony
2016/5/20
The Institute for Photogrammetry and Engineering Surveys has conducted tests to establish the topographic mapping potential with a number of French, Russian, Indian and German high resolution sensors ...
Integration of cartographic and cadastral data in a common information systems
Integration cartographic cadastral data common information systems
2016/5/20
The project entailed the construction of a land use database for the Public Administration of “Borgo Val di Taro” in northern Italy. The task was accomplished by integrating the existing data provided...
Integrated sensors for improved 3D interpretation
Airborne laser scanning 3D city models DEM
2016/5/20
The use of GPS and Inertial Navigation Systems in combination with topographic sensors are discussed. Topographic data are acquired using scanning laser range finders and high-resolution digital camer...
针对光学元件的面形测量，提出了一种被测件随机移相干涉面形测量法，用于降低移相干涉仪的成本，避免移相器老化产生的移相误差对面形检测精度的影响。该方法利用微位移驱动器驱动被测件在摩擦气浮复合导轨上移动进行随机移相并用相机采集若干幅干涉图；然后利用最小二乘迭代算法处理干涉图数据进而迭代出被测表面相位分布；最后进行一系列数据处理求解出被测件的面形结果。为了验证该方法的可行性，在实验室搭建了改进的斐索移相干...
基于零基线的DBBC检验
零基线 PCAL DBBC 相关处理
2016/11/8
比较设备非线性时延校正前后的DBBC设备时延一致性。设计零基线干涉测量试验，对VLBI系统中DBBC设备的时延一致性进行了测量试验；针对设备时延的非线性，利用PCAL信号对DBBC设备进行标校；用MATLAB处理软件对试验数据进行处理和分析。试验结果表明：零基线干涉测量相关处理算法有效；经过PCAL信号非线性时延标校的DBBC设备群时延准确性相对设计指标高了一个数量级。
针对增量式运动恢复结构算法在无人机影像三维重建中运行效率低的问题，提出了一种基于关系图的无人机影像批处理重建方法。利用无人机低精度的位置姿态测量系统数据概略估算影像间的重叠关系，在关联影像之间进行尺度不变特征变换匹配，使用随机抽取一致性算法和三视图约束进一步剔除弱关联的影像连接关系，再通过深度优先搜索得到最终参加重建的影像集连通分量，构建出强关联的稳健影像关系图。然后，根据影像相对位姿参数，由最小...
为改善惯性压电驱动器输出性能，提出了一种新型具有偏置结构的非对称惯性压电旋转驱动器。在非对称夹持的基础上，定义了一种偏置结构。为了解偏置结构对驱动器输出性能的影响，建立了机构的力学模型方程，推导并仿真分析了驱动器的动力学特性。设计、制作了试验样机，搭建了试验系统；进行了试验测试并与无偏置结构驱动器进行了性能对比。结果表明：偏置距离为15 mm时，驱动器输出步距角速度最大。与无偏置结构驱动器相比，驱...
针对大视场空间相机的像移补偿，建立了基于坐标变换和姿态动力学的离轴三反大视场空间相机通用像移速度场模型。建模过程中考虑了离轴三反光学系统的离轴角对像移模型的影响，推导了离轴三反大视场空间相机的像速场解析式。以某大视场空间相机为例，分析了3种典型成像姿态下焦面像移速度和偏流角的分布特点，研究了卫星姿态稳定度对相机成像质量的影响。分析表明，卫星三轴姿态稳定度的降低会导致相机焦面动态传递函数（MTF）下...
某地区地形地貌复杂,无人机为了更好的规避障碍,实时监测无人机的高度非常重要。提出了一种基于信息融合的高精度容错高度测量系统,该系统利用GPS、气压高度计和IMU三种传感器的冗余与信息融合的方法进行高度的测量,对这三种传感器的原理和模型进行分析,研究基于联邦滤波器的高度信息融合方法,在此基础上,深入探讨这三种传感器的信息预测和融合过程,并进行了高度测量系统的仿真,仿真结果表明：高度测量系统设计合理,...
The European DEM (EuroDEM) - Setup and Harmonisation
Fusion DEM/DTM Multiresolution Database Threedimensional Quality
2015/12/18
The fusion, respectively the homogenisation, of the digital terrain models of the countries of Europe to a Europe-wide digital elevation model with a vertical accuracy of 8 to 10 m is described. EuroG...
Validating Global Digital Elevation Models with Degree Confluence Project Information and ASTER-DEM on Geo Grid
DEM Validation GTOPO30 SRTM ASTER Data Integration
2015/12/18
There are two major freely available global digital elevation datasets, known as GTOPO30 and SRTM. To know the accuracies of those data in global scale, relative evaluation of these data and validatio...