Table of Content

25 December 2018, Volume 0 Issue 12

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Quality Analysis of Observation Data of BeiDou Global Experimental Satellites

HE Yilei, WANG Zhiwen, WANG Qianxin, MAO Ya

2018, 0(12):  1-5.  doi:10.13474/j.cnki.11-2246.2018.0374

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Five new-generation BeiDou global experimental satellites have been launched into inclined geosynchronous orbit (IGSO) and medium orbit (MEO) since March 2015. The quality of observation data directly affects our country's BDS globalization process, so it is necessary to master the quality of the observation. In this paper, the real observation data of 16 iGMAS stations and 6 MGEX stations from October 1 to October 21, 2017, are used to analyze the observation data quality of new-generation BeiDou global experimental satellites in terms of signal-to-noise ratio (SNR), data integrity rate, multipath, and ionospheric delay. The results show that the data integrity rate of the B1 and B3 frequency of the BeiDou global experimental satellites and the BeiDou working satellites are equivalent. The SNR of the experimental satellites are better than those of BeiDou working satellites. The multipath error and the ionospheric delay error of the experimental satellites are slightly better than those of the BeiDou satellites. Therefore, the BeiDou global experimental satellites can meet the normal requirements of BeiDou satellite navigation system.

Adaptive Square Root Unscented Particle Filter Algorithm and Its Application

LI Xiaoming, ZHAO Changsheng, ZHANG Likai

2018, 0(12):  6-9,14.  doi:10.13474/j.cnki.11-2246.2018.0375

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Target tracking in dynamic positioning observation equations is nonlinear and stochastic model with uncertainty, and goals in the process of movement by the random disturbance is larger. It is difficult to determine a priori variance, which may lead to the update parameter estimation errors in iterative process, which can lead to filter divergence. According to the above problem, this paper presents an improved adaptive square root unscented particle filter algorithm(ASRUPF). This algorithm combines the adaptive filtering theory, square root unscented kalman filter (SRUKF) and particle filter (PF), which determine the system measurement and the probability density function of state noise, to ensure variance matrix is non-negative qualitative. The algorithm effectively improves the single point dynamic positioning accuracy.

Third-order Three-frequency Correction Model and Precision Analysis of GPS Ionospheric Refraction Error

CHEN Shaoxin, XU Liangji

2018, 0(12):  10-14.  doi:10.13474/j.cnki.11-2246.2018.0376

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In order to improve the accuracy of GPS ionospheric signal error processing, a third-order tri-band correction model of GPS ionospheric refraction error is constructed based on the second-order three-frequency correction model of GPS ionospheric refraction error, and verify the accuracy of the model. The experimental results show that the accuracy of the third-order refraction error is 58.3% in the second-order three-frequency correction model of GPS ionospheric refraction error. In the third-order tri-band correction model of GPS ionospheric refraction error, The correction accuracy is 98.8%, and the correction accuracy of the third order refraction error of GPS ionospheric refraction error is improved by 40.5%. In the path delay correction (phase delay, group delay), the path delay of the third-order three-frequency correction model is different from that of the second-order three-frequency correction model. The phase delay correction is increased by about 3.01×10^-7 m, group delay correction is reduced by about 3.45×10^-7 m, and the ionospheric path delay is controlled to verify the feasibility of the model.

Influence Factors Analysis of GNSS/Acoustic System Positioning Accuracy

KUANG Yingcai, LÜ Zhiping, CAI Wenjiang, WANG Fangchao

2018, 0(12):  15-20,45.  doi:10.13474/j.cnki.11-2246.2018.0377

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In the process of establishing the ocean geodesic control network, the positioning of the seafloor control point is usually determined by using the combined way of GNSS/acoustic. In this paper, the influence factors of GNSS/acoustic system positioning accuracy are discussed in detail, such as dynamic positioning of ship borne GNSS, surveying ship track and the numbers of measurement points, underwater acoustic positioning and the performance transponder arrays. Then the simulation experiments are designed for quantitative validation. The experiment simulates the control points in the form of a circular array. The GNSS measured data on the sea and the simulated underwater range data are used to analyze the positioning performance of the system under the impact of three main factors. Results show, the error influences can be weakened and more accurate positioning results can be obtained through the following ways:the improve of dynamic positioning accuracy of ship borne GNSS, the appropriate increase of measurement points numbers or observation amounts and the reasonable design of transponder array configurations.

An Improving Image Boundary Tracking Algorithm Based on Eight Neighborhood

HU Jinshan, KANG Jianrong, ZHANG Qi, LIU Pengcheng, ZHU Mingda

2018, 0(12):  21-25.  doi:10.13474/j.cnki.11-2246.2018.0451

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Aiming at the limitation of traditional boundary tracking algorithms which are mainly used to extract annular closed boundary, an improved boundary tracking algorithm based on eight neighborhood targets is proposed, which focuses on the internal and external boundary calibration and "solated island" processing in image tracking. The proposed algorithm and the Moore neighborhood boundary tracking algorithm are used to test the four images in the MPEG7-CE image library respectively. The results show that the improved algorithm is correct. Finally, the algorithm is applied to the sea ice extraction of the Arctic snow image. Experimental results show that the improved algorithm can effectively extract large range of image boundaries with complex topological relationships.

Registration Method from Coarse to Fine of Skull Point Cloud Model

ZHAO Fuqun

2018, 0(12):  26-29,35.  doi:10.13474/j.cnki.11-2246.2018.0378

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Skull registration is an important step of craniofacial restoration,the accuracy of which plays a key role to the recovered results.To improve the registration accuracy of skulls and solve the registration problem of different solutions,a 3D skull point cloud registration method from coarse to fine is proposed in the paper.Firstly,coarse registration of skulls is completed using the point cloud registration method based on neural network (NN).Then the iterative closest point (ICP) is improved by integrating scale factor and simulated annealing coefficient into it and used to complete skull fine registration.The improved ICP algorithm could improve the accuracy and speed of fine registration and achieve the final registration of skulls with high accuracy.An unknown skull is registered with 300 skulls in database in the experiment,the results show that the NN-based point cloud registration method could align the skulls coarsely,and the registration accuracy and convergence rate of improved ICP algorithm increase by about 30% and 50% respectively compared with ICP algorithm.So the proposed skull registration method from coarse to fine is an effective skull registration method which could complete accurate registration of 3D skull model.

A New PSInSAR Algorithm Based on Sentinel-1 Consecutive Interferograms

LIU Fei, PAN Bin

2018, 0(12):  30-35.  doi:10.13474/j.cnki.11-2246.2018.0379

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The traditional PSInSAR algorithm use single master baseline configuration, which may cause low coherence and complicated workflow. Aiming at this problem, this paper makes use of the data of Sentinel-1 which have shorter temporal and perpendicular baseline,introduces consecutive interferograms.This new baseline configuration forms interferograms between two images adjacent in acquisition time,which can improve coherence,so that higher quality of interferograms and PS points,and more accurate phase unwrapping results can be got.And a new algorithm based on this new baseline configuration properties for estimating topographic error phase by interferograms difference are introduced at the same time,and in this way more accurate results can be achieved.We acquire 32 Sentinel-1B images over Tianjin city from November 2016 to January 2018,to detect subsidence of this area.As a result,31 consecutive interferograms are formed,we use time series analysis to generate the subsidence velocity map over Tianjin city,and finally compare the results to levelling data to validate this new algorithm.

Location Model of Evacuation Shelters for Urban Planning

XU Jinghai, QIN Jun

2018, 0(12):  36-40,58.  doi:10.13474/j.cnki.11-2246.2018.0380

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According to the characteristics of evacuation shelters' site selection and the working process of urban planning, a multi-constraints condition model for urban planning is established. On the basis of the existing model, the multi-objective function and multi-constraint conditions are formulated by considering the number of evacuation places, location selection, path service length and population capacity. A solution algorithm based on iterative computation is designed, the service range of evacuation sites is calculated under the support of ArcGIS network analysis function, and the advantages and disadvantages of the layout are analyzed. A location analysis system of evacuation sites based on GIS is developed. It is successfully applied in the location planning of shelters in the new town of Taizhou city, and good results have been achieved.

Research on Aerosol Optical Depth and Its Temporal and Spatial Analysis in Xuzhou City Using MODIS

LU Xiu, LI Jia, DUAN Ping, CHENG Feng

2018, 0(12):  41-45.  doi:10.13474/j.cnki.11-2246.2018.0381

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In recent years,more and more attention has been paid to the influence of aerosol on the environment. Aerosol optical depth (AOD) is one of the most important factors to characterize aerosol. This study was based on the MODIS L1B data from March to September in 2016 and the AOD of Xuzhou city,Jiangsu province was remote sensing inversion monitored by dark pixel method and 6S radiation transmission model. Based on the results of inversion of AOD,the temporal and spatial variation and different characteristics of AOD in Xuzhou city in 2016 are analyzed. The analysis results show that the AOD values of the different geographic units are consistent rule,of which the thickness value is the largest in July,the second in May,the smaller in March,the lowest in April,June,August and September. The AOD values of Tongshan county,Pizhou city and Xuzhou city are obviously higher than the average level of Xuzhou area. The AOD values of Xinyi and Suining areas are relatively high,and the AOD of Peixian and Fengxian areas and so on are the lowest.

The 3D Roadway Alignment Measurement for High Definition Map

LUO Wenting, LI Lin

2018, 0(12):  46-51.  doi:10.13474/j.cnki.11-2246.2018.0382

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3D high definition (HD) map is a critical part of driverless systems and a basis of intelligent transportation. This study collects road alignment data by LiDAR system and INS, and provides a series of algorithms for roadway alignments extraction and calibration, which can eliminate the impacts of vehicle vibration and wandering. The lane markings are identified and positioned based on dilation and erosion operation and Canny edge detection. Based on the lateral position of lane marking the center line of the lane is obtained. The PT and PC are detected by linear fitting analysis, and curve radii is calculated using chord offset method. The cross slope is calibrated by transverse profile data, and the longitudinal grade is calibrated by bilateral filtering algorithm. This study provides a case study of 3D HD maps creation for Pushang grade-separated interchanges on Fuzhou. The validation test results show that the errors of PT detection, PC detection and curve radii measurement are 2.97%, 2.54%, and 1.16% respectively. The P-values for validation tests of cross slope and longitudinal grade measurement are 0.631 and 0.945 respectively based on Dunnett's test. It implies that the proposed methods have high accuracy on roadway alignment measurement. This study provides data basis for driverless system.

Study on Multi-source Data Height Anomaly Correction Algorithm in ADAS Navigation Map

HUANG He, CHEN Zhifeng, YI Pengjun

2018, 0(12):  52-58.  doi:10.13474/j.cnki.11-2246.2018.0383

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In ADAS navigation maps, multi-source data fusion and ADAS navigation map data collection methods often cause elevations in the ADAS data that do not conform to actual anomalies. The data collected in different periods are different because of various systematic errors in the collection process (collection mode, collection environment, and personnel). This has led to the problem of the discontinuity of LINK level elevation that is currently prevalent in ADAS navigation map data. Due to space limitations, this article only discusses control layer processing issues. The ADAS elevation anomaly constraint correction algorithm based on the idea of global level network adjustment is proposed. Experiments show that this method can realize the processing of elevation discontinuity and elevation abnormality of the whole ADAS data. It has the advantages of good overall conformance, small change of original data elevation, and reasonable overall (all LINK nodes are not abnormal).

Construction and Application of Integrated Coordination and Cross-efficiency Evaluation Model and Dynamic Change Assessment

CHE Guowei, WANG Zemin, YANG Zhengli

2018, 0(12):  59-64.  doi:10.13474/j.cnki.11-2246.2018.0384

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In order to solve the sustainable development evaluation problems derived from the data envelopment evaluation model under the self-evaluation system, such as, of "enhancement of strengths and weaknesses" "complete ranking of advantages and disadvantages", and "extreme weights", etc., an integrated coordination cross-efficiency evaluation model is proposed in this paper. This model containes 19 evaluation indicators, of which 11 inputs and 8 outputs. The model can overcome the problems of multiple solutions and instabilities of the average cross-efficiency model by relaxing the average hypothesis of the general cross-efficiency model, thereby reducing the distance between the weighted input and the weighted output of the regional sustainable development assessment difference. In addition, we also construct the Malmquist index model of regional sustainable development based on DEA. Finally, the efficiency and dynamic changes of the sustainable development are validated effectively by evaluating the 10 provinces in the eastern coastal region of China as an example.

Decentralized Load Balancing Method for Distributed Spatio-temporal Database

HU Ke, LI Chengming, SHEN Jianming

2018, 0(12):  65-68,128.  doi:10.13474/j.cnki.11-2246.2018.0385

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Currently, distributed spatio-temporal database has become the mainstream measures of spatio-temporal data storage, and it is the essential method to store multi-source heterogeneous data and massive spatio-temporal data. However, when using distributed spatio-temporal database to store data, there is a problem of mass data storage and multi-user and high concurrent literacy. Therefore, the implementation of load balancing has always been a hot research topic in distributed storage technology. In this paper, the annular model is applied to the stored spatio-temporal data for the first time. This method can dynamically manage spatio-temporal data and achieve load balancing among distributed nodes in the case of high concurrency of multi-user.

BIM-GIS Integrated Visualization Method Based on Multi-resolution Hierarchical Model

CHEN Yulong

2018, 0(12):  69-73.  doi:10.13474/j.cnki.11-2246.2018.0386

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The integration of BIM and GIS, realizing information sharing and interoperability between them, has opened up a new way of multi-dimensional application of data in different fields, and has become one of the hotspots of current research. Taking typical BIM data (RVT) as an example, this paper presents a method of BIM-GIS data integration and visualization based on multi-resolution hierarchical model. On the basis of inheriting BIM geometry, appearance and semantics information, the method of continuous multi-resolution hierarchical model is adopted to realize the lightweight of BIM-GIS and enhance the real-time rendering of large-scale BIM-GIS scene. The efficiency of the model is improved, and the building, HAVC and pipeline RVT models are taken as an example.

Efficient Parallelization of Topology Checking for Cadastral Data in Cloud Computing Environment

HE Qun, YANG Yizhou, GUO Jiateng, WU Lixin, LIU Shanjun

2018, 0(12):  74-78.  doi:10.13474/j.cnki.11-2246.2018.0387

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For large-scale spatial data sets, the computational efficiency of the current serial topology checking algorithms have reached their limit. More computing resources are needed to achieve efficient parallel computing of topological relation. Based on the analysis of hierarchical and topological features of topological relational computing, a parallel computing method based on vector data partition and Q&R parallel index was proposed in this paper. A parallel topological relationship computing middleware was developed and deployed in the cloud environment, and applied to the quality checking of cadastral data mass. The application results in the virtualized cluster resources of cloud environment demonstrate that, the proposed method can realize the high balance of computing task load and the basic balance of data load among the process; the acceleration ratio is linearly positively correlated with the number of processes, and the computing efficiency of parallel topological algorithm is stable at 80%. This paper presented an efficient and available parallel computing algorithm and parallel computing middleware in the cloud environment for topological relationship quality checking service of massive cadastral databases in various high-performance computing environments.

Using RBF to Analyze the Accuracy of GNSS Height Transformation in Linear Engineering

CHEN Zhiwei, ZHANG Xingfu, HU Bo, LIU Cheng

2018, 0(12):  79-82,86.  doi:10.13474/j.cnki.11-2246.2018.0388

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The application of GNSS rapid height measurement is mainly affected by accuracy of height anomaly transformation. Therefore, it is rather important to construct a reasonable height anomaly transformation model.This paper discusses the RBF method of GNSS height transformation with GSVS2011 GNSS/leveling data in the United States,the accuracy of height transformation based on five RBF kernel functions such as Thinplate (T),Cubic (C),Gaussian (G),Multiquadrics (M),Linear (L) is analyzed in details.The experimental results show that ①When the distance between GNSS/leveling points is small,the five kernel functions can also obtain higher fitting accuracy.②Three kinds of kernel functions(T、C、M) have a better fitting effect,and more than 95.3% of the fitted height difference meets fourth-order level tolerance.③It is suggested that the point interval should not be greater than 30 km in the survey area where the height anomaly changes relatively flatly when fitting with RBF.

Realization of BDS/GPS Grid Virtual Pseudorange Differential Positioning and Pseudorange Correction Differential Positioning

ZHANG Jingjing, CHEN Xianchun, BI Jinzhong, FANG Shushan, CHENG Bing

2018, 0(12):  83-86.  doi:10.13474/j.cnki.11-2246.2018.0389

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In order to solve the problem that large-scale reference stations provide network RTD services for mass users and guarantee the security of base station coordinates and data, this paper studies and implements BeiDou/GPS RTCM3.2 pseudorange differential services based on the grid virtualization differentiated service model. Compared with RTCM2.3 pseudorange correction difference service, this paper implements two kinds of differentiated services to form a complete network RTD data source service. Both types of services have been validated in the Sichuan Provincial BDS CORS. After testing, the grid virtual differential positioning services approach is feasible and can guarantee the security of the base station information. Also,this approach can increase the number of concurrent users by 50%. This approach can be used in provincial and regional CORS network RTD service.

An Auto-extraction Method of Structural Road Elements from Mobile Laser Scanning Data

HAN Xu, LIANG Xinmei

2018, 0(12):  87-90,100.  doi:10.13474/j.cnki.11-2246.2018.0450

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The road recognition is important to automatic driving and machine navigation. This article develops an extraction method of vehicle laser scanning point clouds by using local feature restriction to pre-segmentation and then extracts point clouds of road elements with multi-scale clustering. The results show that the method is efficient in structural road elements recognition.

Construction of Tree Crown Three-dimensional Model Using Alpha-shape Algorithm

LI Qing, GAO Xiangwei, FEI Xianyun, ZHANG Hong, WANG Jian, CUI Yunjian, LI Bin

2018, 0(12):  91-95.  doi:10.13474/j.cnki.11-2246.2018.0390

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In order to study the method of constructing the three-dimensional model of canopy, in this paper, the point cloud data acquisition platform was a three-dimensional laser scanner (Leica scanstation C10), with a common greening tree Zelkova serrata chosen as an experimental sample. Based on the points cloud of sample tree crowns, the 3D crown models were constructed using the alpha-shape algorithm in the Matlab software with different size value of the parameter-α. The results showed that when larger parameter-α value was employed, the 3D model was more general and the crown internal construction could not be described. With the decrease of the parameter-α value, the 3D model was becoming more and more detailed. When it decreased to a certain lower value, the modeling result became some of discrete graph patches, then the reconstructed results were incomplete and could not form a completed 3D model of the tree crown. The 3D crown model constructed by using the alpha-shape algorithm can reflect the different spatial morphological characteristics of the crown, and can be used as the base for the calculation of crown structural parameters.The results of the study can be used as reference for calculating the related structural parameters in further research work.

Image Similarity Computation by Using Histogram Method

ZHU Shuang

2018, 0(12):  96-100.  doi:10.13474/j.cnki.11-2246.2018.0391

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Color histogram image retrieval, which is based on the color character, is a very effective image retrieval method. In this paper, image similarity is defined as the intersectant area between two gray level probability histograms. It ranges from 0 to 1. This concept is more specific to describe the image similarity. Some groups of remotely sensed data's image similarities are computed to test whether this method is valid or not. The result shows that this method can discriminate the images from each other easily, which is more effective than the information entropy method to compute image similarity. As a whole, it is a feasible method.

Point Cloud Simplification Algorithm of Quadric Error Based on the Optimal Neighborhood

LU Jianhua, LIU Chuang, LÜ Zhicai

2018, 0(12):  101-104,113.  doi:10.13474/j.cnki.11-2246.2018.0392

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Point cloud simplification algorithm of quadric error based on the optimal neighborhood is proposed,aiming at solving the problem of error accumulated and error transferred.The feature points are extracted based on the geometric properties of point cloud neighborhood.The entropy function is built based on dimension feature,the optimal neighborhood is determined with the minimum entropy function principle,the non-feature of point cloud simplification is realized with the theory of quadric surface fitting error control combined.The result of the simplified is evaluated by the information entropy function based on quadric error evaluation index.Experiment shows that the algorithm can effectively decrease error influence,better service in the late of surface reconstruction.

Real Projective Processing of UAV Based on Image Consistency Detection

SHEN Cailian, XU Liuhua, MA Xuwen

2018, 0(12):  105-108,124.  doi:10.13474/j.cnki.11-2246.2018.0393

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To solve the image "ghosting" problem existing in differential correction of unmanned aerial vehicle (UAV) TDOM image processing, this research puts forward a UAV TDOM image rectification based on image consistency. On the basis of grid division on differential correction region, and taking in the hash image consistency detection algorithm, this technology accurately detect and fast position the masking area of construction images based on the underground point radiation, and select the best image through the optimal underground point distance to compensate the masking area. The experimental results show that the algorithm is adaptable to the UAV small image and large field Angle image.

Correlation Analysis of Vegetation Coverage Change and Climatic Factors in Shandong Province

SONG Pengfei, JI Min, LI Gang

2018, 0(12):  109-113.  doi:10.13474/j.cnki.11-2246.2018.0394

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In order to analyze the temporal and spatial pattern of vegetation coverage change and its correlation with climatic factors in Shandong province in recent ten years, this paper utilized MODIS/NDVI data, precipitation data and temperature data from 2005 to 2015, combined the model of center of gravity to realize the spatial pattern analysis of vegetation changes in Shandong province in last decade. Kriging was used to interpolate the precipitation and temperature data, then, the correlation coefficient analysis of the influence of precipitation and temperature on the vegetation cover during 2005 to 2015 was carried out. Finally, we analyzed the lagging response of vegetation to precipitation and temperature. The results show that there is a significant increase in vegetation coverage in Shandong province in recent ten years, precipitation and temperature have different degrees of positive correlation with vegetation growth, and the impact of temperature on vegetation is greater than the impact of precipitation on vegetation. Vegetation growth on the precipitation and temperature response showed significant lag effect.

Study on the Space Layout of Rail Transit Development of “the Belt and Road” Node Urban Agglomeration: A Case Study of Lanzhou-Xining City Region

GAO Yuxiang, HAN Feng, DUAN Xiaofeng

2018, 0(12):  114-118.  doi:10.13474/j.cnki.11-2246.2018.0395

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Rail transit is a link between cities, which can strengthen communication and cooperation among cities and promote regional economic development.Taking Lanzhou-Xining urban agglomeration as the research object,the spatial distribution law of the density and accessibility of the rail transit network is studied by using the ArcGIS software, statistics and economic geography method.At the same time,the main factors affecting the rail transit development in the region are analyzed, and the future rail transit construction plan in this area is planned.The results show that the rail transit development in central cities,Lanzhou and Xining with high road network density and accessibility is good.The rail transit construction in Lanzhou region is better than that in Xining region, and there is no through rail transit between sub center cities and central cities.According to the planned rail transit construction plan,the rail transit network layout in the future will be further optimized, which can provide the support for the "the Belt and Road" initiative node city group construction.

Construction of “3D+” Pan-information Spatial Database in Chongqing and Practice of Basic Surveying and Mapping Transformation in the New Era

CAO Chunhua

2018, 0(12):  119-124.  doi:10.13474/j.cnki.11-2246.2018.0396

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The construction of a new basic surveying and mapping system is an important development strategy for improving the ability and level of the basic surveying and mapping service in our country. As a typical mountainous city, Chongqing has a strong urgency in the research and construction of its new basic surveying and mapping system. Based on the perfect system of mapping geographic information system, modern surveying and mapping datum, and three-dimensional data collection and updating system, the Chongqing geo-information bureau has carried out the "3D+" pan-information spatial database and its application and demonstration construction. A pan-information, fine and dynamic three-dimensional spatial data system has been constructed to realize the fusion ability of pan-spatial, virtual-reality and static-dynamic. Taking Chongqing as the sample, the transformation and upgrading path of basic surveying and mapping has been formed, that will promote the deep integration of industry information and geographic information.

Construction Technology of Multi-sensor Unmanned Aerial Vehicle Inspection System

LI Chong, SHE Yi, LI Haolin

2018, 0(12):  125-128.  doi:10.13474/j.cnki.11-2246.2018.0397

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Aiming at the problem of insufficient function in checking mathematical accuracy and correctness of element attributes in current geographic information product quality inspection software, a software system construction method based on LiDAR, image, video, POS and other multi-source data joint inspection precision and attribute is proposed. The system design concept is introduced from the aspects of overall architecture design, database design and functional design. Practice has proved that the system has reliable inspection results, which can greatly improve the efficiency of precision detection and attribute evaluation, and is of great significance for the quality control of geographic information products.

Construction of Automated Generalisation Knowledge Rules for Geographic Information Data——Taking Building Elements as an Example

YIN Xiangjun, YIN Jie, HUANG Zhizhou, YU Bin

2018, 0(12):  129-132,147.  doi:10.13474/j.cnki.11-2246.2018.0398

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Based on knowledge driven by technology of automated generalisation,this paper carries on analysis and research about automated generalisation knowledge rules. A machine-executable knowledge base for automated generalisation is built up. Through the verification of instance data,the multi-scale linkage update of geographic information data has been realized. The results will broaden the breadth and depth of geographic information data services, and will positively promote the conversion of automated generalisation rules of geographic Information data to industry standard and the improvement of generalisation degree.

Construction of Submitting Regulatory Detailed Planning for Approval System Based on Business and Spatial Monitoring in Parallel—Taking Nanjing as an Example

DOU Wei, HUANG Zhizhou, CUI Bei

2018, 0(12):  133-137.  doi:10.13474/j.cnki.11-2246.2018.0399

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This paper studies on a GIS data quality checking method base on workflow, presents an implement mentality of submitting regulatory detailed planning for approval system based on business and spatial monitoring in parallel and studies the system construction method taking Nanjing for instance. The paper resolves the problem of multi-process interleaving and the interleaving of OA and GIS. Checking of some technical specifications in the process is implemented base on spatial monitoring and GIS spatial analysis, which improves the efficiency and scientificity of the technical checking of regulatory detailed planning.

Research and Construction of Integrated Urban Design Management Platform Based on Current Three-dimensional GIS of Nanjing

WANG Shukui, WANG Furong, CUI Bei, WANG Qing, GAO Fensheng, ZHANG Wei

2018, 0(12):  138-143.  doi:10.13474/j.cnki.11-2246.2018.0400

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With the rapid development of urbanization, urban construction has obtained a great achievement. Meanwhile, some chaotics emerged such as big, foreign and new scales etc. As an important technical means to guide urban space construction, urban design was highly valued. This manuscript mainly introduced that Nanjing carried out the research and construction of integrated urban design management platform based on current three-dimensional GIS by taking the national pilot city of urban design as an opportunity and taking the problem as the orientation, and then realized a full-process solution for urban design management from the standard to data production and from platform construction to system application, as well as assisted creating good urban space environment to meet the need of Nanjing urban planning, construction and management and could provide relevant experience to other cities.

Construction and Application of Online Open Course of Digital Image Processing for MOOC Platform of Chinese Universities

JIA Yonghong, FU Zhongliang, SUN Heli

2018, 0(12):  144-147.  doi:10.13474/j.cnki.11-2246.2018.0401

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Construction and application of online open course of digital image processing for MOOC platform of Chinese universities are discussed in this paper.The practice of on-line teaching and mixed teaching shows that the construction and application of digital image processing MOOC improves the teaching scale, promotes the sharing of teaching resources, Blended teaching strengthens the communication between teachers and students, improves students' autonomous learning ability and teaching efficiency, It is helpful to deepen teaching reform and improve teaching quality.

Cultivating Innovation Ability of Surveying and Mapping Undergraduates Using Teachers' Scientific Projects

LI Li, LIAN Dajun, CHEN Guodong

2018, 0(12):  148-152.  doi:10.13474/j.cnki.11-2246.2018.0402

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University is an important platform for innovation ability training. It is an organic part of the national innovation system. Aiming at the lack of innovation ability of Chinese undergraduates, a new talent cultivation model of undergraduates' innovation ability driven by teachers' scientific projects is proposed combining with the problem-based research learning method in this paper. The sub-projects derived from the scientific project undertaken by teacher can be used to cultivate undergraduates' innovation ability by completing the scientific research tasks under the guidance of teacher. The current situation and existing problems of undergraduates' innovation training system are discussed. The advantages, approaches and system construction of undergraduates' innovation training using teachers' scientific projects are discussed as well. Based on the cases analysis in the last several years, the practice shows that good results have been achieved.

Application of Total Station Scanner Technology in Geometric Quality Inspection of Steel Structure

DENG Nianwu, LI Meng, ZHANG Xiao, YANG Tong

2018, 0(12):  153-155.  doi:10.13474/j.cnki.11-2246.2018.0403

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Steel structure geometric quality inspection is an important part of steel structure construction. High accuracy is an important factor in quality inspection, but the node location cannot be directly measured because of welding. High precision total station scanning technology is used to scan steel structure in the paper, and then the point cloud is preprocessed, the surface equations are established, node coordinates in measuring coordinate system are calculated, and are converted to design coordinate system, finally the geometric quality of steel structure is evaluated. The theoretical and practical researches shows that the method can match geometric quality inspection of steel structures.

The Application of 3D Laser Scanning Technology in Safety Identification of Water Conservancy Engineering

WANG Lingfeng, QI Minmin, XU Yezhang, DUAN Wenyi

2018, 0(12):  156-158.  doi:10.13474/j.cnki.11-2246.2018.0404

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For the problem that traditional measuring instruments such as total station can not measure the inclination and relative displacement of hydraulic structures. This paper introduced the application of 3D laser scanning technology in the safety identification of water diversion aqueduct in Zhejiang Province. It is proved that the 3D laser scanning technology can effectively reflect the inclination of the overhead aqueduct column and the horizontal displacement of the groove body relative to the supporting column, provides a new method for related applications in water conservancy and other industries.

Application of 3D Laser Scanning Technology in Topographic Mapping

WANG Renyin, LI Kaiwei, CHEN Rui, YE Bo

2018, 0(12):  159-162.  doi:10.13474/j.cnki.11-2246.2018.0405

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Three-dimensional laser scanning technology breaks through the traditional point-by-point measurement and achieves surface scanning data acquisition. Using high-speed laser scanning measurement, the three-dimensional coordinate data of the measured object surface can be obtained quickly, which has the characteristics of fast acquisition speed and abundant data acquisition. Moreover, the measurement distance is long and the data is accurate, and it is not restricted by the accuracy of geoid. In this paper, three-dimensional laser scanning technology combined with RTK technology is introduced. After measuring the locating point of scanner and the orientation point of rear-view target, the continuous three-dimensional coordinates in the panoramic range are obtained. Station scanning is set outside the field of vision to make the whole survey area free of loopholes and finally realize topographic map production.