Table of Content

25 July 2017, Volume 0 Issue 7

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Ultra Short-term Forecasting of Earth Rotation Parameters Based on LS+AR

HAN Hengxing, DANG Yamin, XU Changhui, WANG Hu, GU Shouzhou, ZHANG Longping

2017, 0(7):  1-4.  doi:10.13474/j.cnki.11-2246.2017.0212

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Earth rotation parameters (ERP) are integral parameters for transformation between the celestial coordinates and the terrestrial coordinates in satellite precise orbit determination, and are also important products for Intenational GNSS Service (IGS) and International GNSS Monitoring and Assessment System (IGMAS). To improve the prediction precision of the linear prediction model used by Chinese Academy of Surveying & Mapping (CGS), the best method of ultra short-term forecasting based on LS+AR is researched. The optimal data length is determined with the CGS data, and then the LS+AR is used to predict the ultrshort term ERP. The results are compared to that of the IGS and iGMAS and show that the optimal data length is eight days (sessions). The prediction precision of LS+AR is much better than that of LS, and also better than the linear model used by CGS. The results also show that the x and y direction prediction of ERP is better with the session's data than the day's data, while the LOD is better with the day's data than the session's data. The LS+AR ultrashort term prediction is a good method to predict the ERP for IGS and iGMAS analysis centers.

An Integrated Positioning Method for GPS+PDR Based on Improved UKF Filtering

NIU Huan, LIAN Baowang

2017, 0(7):  5-9.  doi:10.13474/j.cnki.11-2246.2017.0213

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In view of the deterioration of received signal quality, an improved GPS+PDR fusion positioning system applicable for signal shielding environment has been proposed. This method uses gyro integrating data within short time to correct heading deviation of digital compass, which has eliminated the incidental interference for digital compass to some extent significantly. UKF (unscented Kalman filter) algorithm used for constraining residual has been adopted to make fusion treatment for GPS and PDR positioning information, which has got over the position drift problem produced by cumulative heading error in PDR positioning effectively and improved the positioning accuracy and stability of algorithm. Experimental results show that the improved algorithm can restrain the drift error of digital compass effectively and the relative heading error has decreased by 56% on average. During walking, the standard error of GPS positioning is 2.67 m and the standard error of pure PDR positioning is 6.83 m. GPS data in several points have been offered randomly to assist positioning, the standard error decreased to 3.12 m. With GPS and PDR positioning integrated in the whole process, the standard error can be decreased to 1.94 m.

A Method of GNSS Regional Station Observation Data Quality Detection

GENG Xiaomin, QIU Jiangtao

2017, 0(7):  10-13.  doi:10.13474/j.cnki.11-2246.2017.0214

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After years of observation and accumulation, GNSS data have formed large data scale. Facing large area and multi-year GNSS data, we need to study the data quality detection method to form a fast and normalized detection mechanism to provide quality assurance for GNSS data rapid extraction and application. In this paper, a method of quality detection for GNSS regional station observation data is proposed based on TEQC technology, the detection content, detection method and key points of the method is analyzed. we use the method to complete the 10 stages data quality detection of more than 660 stations in the North China.Experimental results show that the method can be applied to the quality detection of large-scale GNSS stations, which can provide a reference for the national GNSS station data quality detection.

Simulating SAR Images and Correcting Terrain Radiation Using DEM

XUE Dongjian, LI Zengyuan, ZHENG Jie, LI Chengrao, LI Wanqiu

2017, 0(7):  14-17.  doi:10.13474/j.cnki.11-2246.2017.0215

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The simulated SAR image is beneficial to the automatic registration of the control points and image correction,especially in the mountains, where it is very difficult to get the ground control point. Based on the analysis of SAR imaging geometry and characteristics of ALOS PALSAR satellite orbit parameters, the range doppler (RD)geo-location model is used to calculate the position of the radar imaging point for each grid point of the DEM. The SAR image is simulated, the local incidence angle, projection angle,regularization factor are extracted. The simulated SAR image coincides with the real SAR image texture, which is beneficial to the automatic registration of the control points. And the terrain radiation correction model based on the regularization factor and angle of incidence is constructed to eliminate the distortion caused by the area effect and terrain undulation. From the analysis results, the difference of the brightness and darkness of the image after correction is obviously reduced. It has certain practical significance to radar quantitative inversion research.

Accuracy Assessment of TanDEM-X DEM Generation

YANG Yafu, ZHU Jianjun, XU Bing

2017, 0(7):  18-22,75.  doi:10.13474/j.cnki.11-2246.2017.0216

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At present, many researchers have carried out a series of work about TanDEM-X/TerraSAR-X DEM generation. These research results showed the feasibility to generate high precision TDX/TSX DEM. In order to verify the question of whether TanDEM-X/TerraSAR-X DEM satisfy the requirement of topographic mapping, we need qualitatively and quantitatively analyze the TanDEM-X/TerraSAR-X DEM accuracy. Covariance function method was presented for accuracy analysis of TDX/TSX DEM. Covariance of each distance between pixels with height error was estimated by this method. Then covariance function was acquired by fitting covariance. When distance equal to zero, covariance represents TDX/TSX DEM mean square error (MSE), and covariance function value denoted TDX/TSX DEM estimation of MSE. Covariance function method avoided the effects of gross error on accuracy evaluation. A pair of TDX/TSX SAR images was used to generate high precision DEM by DInSAR technique. The results show that the TDX/TSX DEM accuracy assessed by the covariance function method is feasible, and TDX/TSX DEM accuracy is up to 1.46 m. TDX/TSX DEM can satisfy the requirement of 1:10 000 topographic mapping, and also provide advantageous condition for topographic mapping of void region in China.

The Calibration Method of Vehicle-borne Panoramic Camera Based on the Aerial Triangulation of the Multi-direction Images

LIU Fengying, CHEN Tianen, WANG Dong

2017, 0(7):  23-28.  doi:10.13474/j.cnki.11-2246.2017.0217

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Aiming at the research situation on the calibration method of the panoramic camera, the paper proposed a rigorous method for the calibration of the panoramic camera's internal parameters, which is based on the bundle adjustment of multiple directions images. First to build the calibration field and calibrate the internal parameters of each single camera.Then, to obtain the different photography direction's calibration images of the panoramic camera by rotating photography according to the pre designed camera parameters. The initial relative orientation elements between each single camera are obtained by spatial resection using the calibration images of one camera station and some control points, that is rough calibration. Then to construct regional network with calibration images of all camera stations and bundle adjustment, finally we acquire accurate parameters of the panoramic camera, that is rigorous calibration. The experiment proves that this method can improve the accuracy and reliability of the calibration results, which are the reliable foundation of the panoramic image mosaicing, measurement, color generation of point cloud, and the other follow-up research and application.

Research on Human Activity Recognition with Multiple Contexts by Using Random Forest

LIU Keqiang, WANG Yunjia, CHEN Ruizhi, CHU Tianxing

2017, 0(7):  29-33,44.  doi:10.13474/j.cnki.11-2246.2017.0218

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Previous research has verified the effectiveness of a method which utilizes multiple contexts including temporal, spatial, spatiotemporal and user from smartphone sensors to recognize human activities. But it has limitation in classification accuracy performance when recognizing human activity on smartphones by using naïve Bayes. This paper presents an improving research work on recognizing activity by utilizing a random forest algorithm in ensemble learning instead of original naïve Bayes under the same framework. The result of a ten-fold cross-validation experiment on three subjects' datasets shows that the weighted average F1 measures are improved by using random forest. However, the training time efficiency measures are worse than naive Bayes because of the complex structure of random forest. Meanwhile, the confusion matrix shows that the main factors for classification error are activity definition and indoor positioning error.

Parking Slot Marking Recognition Algorithm in Parking Assist System

WU Xiaogang

2017, 0(7):  34-38.  doi:10.13474/j.cnki.11-2246.2017.0219

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A new method based on improved Hough transform is proposed. Firstly, the local pixel distribution is used to eliminate the influence of outliers. Then, the suitable interval of the linear gradient to the edge of the parking line is adaptively selected based on the pixel histogram. Finally, the selected lines are identified by judging the gray relation,and thus the parking slot marking can be recognized. Compared with the traditional Hough transform and the improved random Hough transform based on the gradient direction region (Grad-RHT),the proposed algorithm achieved a better recognition results and robustness under all kinds of interference background keeping the running efficiency of Grad-RHT.

Pre-earthquake Deformation of Wenchuan M_S8.0 Earthquake Received by ALOS Data

WANG Huiling, ZHANG Yongzhi, GUO Datong, GAO Yang, YIN Peng

2017, 0(7):  39-44.  doi:10.13474/j.cnki.11-2246.2017.0220

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In this paper, using the short baseline technique of synthetic aperture radar interferome, we try to monitor the ground deformation before Wenchuan earthquake. Under the gamma software, the deformation rate of Wenchuan epicentral area in one year before the earthquake was obtained by using stacking technique in June, 2008 and May, 2006. The deformation characteristics indicate that the maximum uplift value reaches 24 cm along the Wenmao fault zone and the two sides of the fault show a downward trend. The maximum sedimentation value reaches 22 cm in the vicinity of Mianyang Town. By comparing with the results of D-InSAR, the two are in good agreement. The trend of vertical deformation field before the earthquake may provide a scientific basis for earthquake prediction.

Remote Sensing Image Trends and Its Application in Agriculture

PANG Zhiguo, CAI Jingya

2017, 0(7):  45-48,54.  doi:10.13474/j.cnki.11-2246.2017.0221

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In this paper, the author systematically introduced the development trends of remote sensing image and its application in agriculture from four key aspects:spatial-temporal features, spectral features, radiant features, and precision and information extraction of remote sensing images. The article also indicated that as the remote sensing sensor and data processing technology continue to evolve, remote sensing technology world fully serve in fields of digital agriculture, precision agriculture and ecological agriculture and intelligently solve every agricultural problem for small farmers worldwide.

Research on Modified Optimum Index Factor Method for Specific Object Extraction

WANG Shengli, ZHANG Lianpeng, LI Xing, ZHAO Zhuowen, SHEN Yang, CHAI Qi

2017, 0(7):  49-54.  doi:10.13474/j.cnki.11-2246.2017.0222

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This paper presents a modified optimum index factor based on one-class support vector machine for extracting specific object. The proposed method was used to extract the photovoltaic power station from the Landsat 8 satellite image in Jiangsu coastal zone. The accuracy evaluation was conducted by referencing the visual interpretation results. The proposed method is useful to extract the specific object from satellite image.

Class-based Change Detection Method Using Vector Map and Remote Sensing Imagery

WANG Gangwu

2017, 0(7):  55-60.  doi:10.13474/j.cnki.11-2246.2017.0223

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In order to solve the land use change detection problem in vector map and remote sensing imagery, this paper puts forward a change detection method of vector map and remote sensing imagery based on category. The remote sensing image segmentation is carried out to obtain image patches under the constraint of vector map. Then the histogram features of remote sensing imagery patches are extracted and the feature distance between image patches is measured by using G statistic. Thus the class heterogeneity of image patches on single wave is constructed by using the feature distance between image patches and other similar image patches, adaptive weighting combines the class heterogeneity of image patches on each band to establish the class heterogeneity of image patches. Then according to the max entropy method, the threshold of the corresponding heterogeneity of each object category is obtained and the change verification is applied based on category classification to get the change information. The proposed method's effectiveness is verified by the experimental results on the QuickBird images and it realizes the automatic change detection of vector map and remote sensing imagery.

Traffic Flow Big Data Clustering Analysis Method Based on Distributed Incremental Mechanism

LI Xin

2017, 0(7):  61-65.  doi:10.13474/j.cnki.11-2246.2017.0224

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Spatio-temporal clustering analysis is an effective way of using spatio-temporal big data. This paper proposes a distributed incremental big data clustering analysis method. The incremental distribution mechanism can not only reduce the repeated calculation and the number of copies, but also can modify the clustering results continuously. And it is able to improve the operational efficiency under the condition of keeping in clustering accuracy. The clustering algorithm includes three steps:data aggregation trend analysis, clustering algorithm and result evaluation. It constructs an integrated spatio-temporal neighborhood, which guarantees the accuracy of clustering results in time and space. The experiments show that this method can realize the fast and efficient information mining of spatio-temporal big-data.

Evaluation of Spatial Development Suitability Based on Geographic National Conditions Information

GONG Yinxi, WANG Ying, LIANG Min, WANG Pei, CHEN Siyu

2017, 0(7):  66-71,80.  doi:10.13474/j.cnki.11-2246.2017.0225

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As an important basic work of the main function division, spatial development suitability evaluation is important in the process of urbanization in coordination. Especially in the coordinated development of space, it has an irreplaceable advantage, in solving the problem of development out of control and disorderly competition. Based on the data of geographic national information data, large-scale basic surveying and mapping data, industry special data and statistical data, combined with GIS analysis and analytic hierarchy process, this paper constructs a suitable evaluation system of spatial development for Yulin city, and analyzes the local suitability of space development. The results show that the most and more suitable area for exploitation and development in Yulin are mainly distributed in the northwest, accounting for 18.4% of the total area. The most unfavorable and unsuitable areas are mainly distributed in the southeast of Yulin, accounting for 39.86% and 41.75% of the total area respectively. The above results are mainly due to the distribution of a large number of mountains, complex terrain and geological disasters in southeastern of Yulin. At the same time, the region's per capita available water resources is relatively limited, which led to difficulty in the development.

Construction and Effect Analysis of Geographical Conditions Census Quality Control System

ZHANG Jixian, ZHAO Yousong, LUO Fujun, DANG Yu

2017, 0(7):  72-75.  doi:10.13474/j.cnki.11-2246.2017.0226

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National geographical conditions census reflects the spatial distribution, the basic characteristics of natural and human factors, and their relationships. It provides a basis for the government to enhance the scientific macroscopic decision-making and rationality configures various resources.Perfect quality control system can guarantee to obtain real,accurate and reliable data in geographic conditions.This article describes the geographical conditions census quality control system's focus, content and effects, which will be a good reference for the quality control of national geographical conditions monitoring.

Application of Integrated Navigation Technology in Taxi Valuation System

MA Yongjian, LIU Songlin, WANG Tonghe, XU Yali, LI Rongpan

2017, 0(7):  76-80.  doi:10.13474/j.cnki.11-2246.2017.0227

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Aiming at the problems in timing and calculating mileage for taximeter, the method of using GNSS+INS+Odometer integrated navigation technology in terms of the taxi is put forward. Using integrated navigation technology in the process of the taxi passenger mileage and time calculation, on the one hand, can avoid the traditional mileage in the process of using odometer itself and human factors to change the actual mileage, affect the accuracy of pricing. On the other hand, the method can avoid the single odometer valuation process once appear fault, the results of mileage will appear larger error or unable valuate, etc., increasing the reliability of the taxi pricing system. The car experiment proves that integrated navigation technology applied to taxi valuation system is able to valuate taximeter mileage, timing, and such key problems as low valuation made great improvement, accuracy and reliability are improved significantly. Avoid contradiction between the passengers, taxi drivers, safeguard the legitimate rights and interests of both sides. This has played a good role in promoting the development of integrated navigation technology.

Application of UAV Remote Sensing in Overseas Highway Reconnaissance

ZHENG Liang, DONG Weiyan, YUAN Baocheng

2017, 0(7):  81-84.  doi:10.13474/j.cnki.11-2246.2017.0228

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UAV remote sensing system provides a new solution for the problem of topographic map surveying in overseas highway project. This paper introduces the composition and performance of UAV remote sensing system. Taking PKM project as an example, the paper discusses the UAV remote sensing technology in highway surveying, and reports the accuracy of the results.

The Method of Extracting Topographic Feature of the Quarry by Laser Point Cloud Data

WU Xiaozhang, XIE Hongquan, XU Ruiji, LONG Hui, LU Xia, WANG Chen

2017, 0(7):  85-88,93.  doi:10.13474/j.cnki.11-2246.2017.0229

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The 3D laser scanning technology, which has the characteristics that the traditional measurement methods do not have,can extract topographic features timely, actively and efficiently. The contour lines and the 3D model can be used to reflect the topographic features of the study area. The data of the laser point cloud are acquired by Leica C10 scanner. Cyclone and Geomagic Studio are used to preprocess the data. Cyclone,CASS and Surfer are used to extract the topographic features. Conventional measurement methods are compared and analyzed.The results show that the three kinds of software can generate contour lines and the ideal three-dimensional model, and all have their own characteristics. As to the production of precision and efficiency, the contour line drawn from the point cloud data is obviously superior to the conventional methods.

Land Subsidence Monitoring and Analyzing of Cangzhou Area Sentinel-1A/B Based Time Series InSAR

ZHOU Hongyue, WANG Yunjia, YAN Shiyong, WU Yue, LIU Xixi

2017, 0(7):  89-93.  doi:10.13474/j.cnki.11-2246.2017.0230

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The surface average subsidence rate and oumulative subsidence of Cangzhou area from November 2015 to November 2016 were obtained with 22 scences of Sentinel-1A/B SAR imagery respective by PS-InSAR and SBAS-InSAR techniques. The annual and accumulative subsidences from both time-series analysis methods had a high coherence with each other. The monitoring results indicated that the ground surface of Xian County,Cang County,Cangzhou urban area had a rebound trend; Qing County,the east of Cang County,the west of Nanpi County and Dongguang County experienced obvious subsidence, especially the accumulating subsidence in Hezhuang village of Dongguang County reached 47 mm.The main reason leading to these obvious subsidences was the over-exploitation of ground-water for agriculture.Moreover, it discussed the application of Sentinel-1A/B SAR images in monitoring urban subsidence and the results would provide important references for the relevant departments.

Power Transmission Line Sag Analysis and Application Based on Airborne LiDAR

ZHANG Changsai, XU Zhihai, YANG Shuwen, LIU Zhengjun

2017, 0(7):  94-98,107.  doi:10.13474/j.cnki.11-2246.2017.0231

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Using the laser scanning technology for power transmission line operation and maintenance can effectively detect the power line defects and channel defects. But because it is limited by the patrol frequency, it may not detect the power transmission line defects timely. This paper describes a power line condition analysis model to simulate real-time dynamic power line state. Considering the influence of environmental conditions such as temperature, wind and icing on the power transmission line, the transmission line sag status will be changed, and the dynamic simulation of the power line is realized by using the power line mechanics. Finally, the simulated power line under the typical weather conditions was tested for safe distance detection,which can find the transmission line corridor hidden dangers timely.

Application and Discussion of UAV Technology in Ecological Remote Sensing Monitoring of Grassland

LI Fengxian

2017, 0(7):  99-102,107.  doi:10.13474/j.cnki.11-2246.2017.0232

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This paper combined UAV with remote sensing system, and established the integration models of low-altitude remote sensing, ground monitoring, satellite, namely "Space-Ground-Aero", for grassland monitoring and information management, which could fill the gap of using current satellite sensors and traditional manual monitoring methods with time and accuracy limition. It opened up a practical and accurate direction for grassland informatization, and great development space in the application of grassland biological disaster monitoring and model refinement. This paper summarized the key technologies and processes of the UAV remote sensing system. According to the grassland monitoring status, application prospect of the technology in grassland monitoring and information management were discussed.

Rapid Acquisition and Application of Air and Ground Panoramic Images

YU Jianjun, XU Gongbo, GUO Wangcheng, YE Jiaqi, LI Jie

2017, 0(7):  103-107.  doi:10.13474/j.cnki.11-2246.2017.0233

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The technology of rapid acquisition and application of air and ground panoramic images uses a variety of transportation equipment carriers, such as mobile collection vehicles, ships, and customized backpacks, combined with other ancillary equipment like ordinary cameras, customized panoramic cameras, GPS, and motion sensors, so that high-resolution panoramic images of air, ground, water or other complex scenes can be quickly obtained. Panoramic images can be processed and released in real time using panoramic images mosaic and fusion software, FlyPano processing software, and Krpano releasing software. This technology is also capable of integrating with professional applications in API forms combined with Map World or other application system interfaces. The standardized and large-scale production of panoramic images of complex scenes can be truly achieved using this technology, so that it has a very good application in various industries.

Deformation Characteristics Analysis and Research of Foundation Pit Related to the Urban Rail Transit in Zhengzhou

YUAN Juliang, GE Mengxi

2017, 0(7):  108-112,128.  doi:10.13474/j.cnki.11-2246.2017.0234

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Statistical analysis of the deformation monitoring data of 20 station pits, from Zhengzhou urban rail transit line 1 and first phase line 2 are given in this paper, The pit risk grade is divided by the depth, and the monitoring projects of ground settlement, top horizontal displacement of pile (wall) and body horizontal displacement of pile (wall) are studied. The measured values distribution of each monitoring project is defined, and the mathematical statistics results of the measured data are given. The maximum value position of body horizontal displacement of pile (wall) is taken, and the influence of foundation pit depth is studied. The deformation law of foundation pit engineering is especially analyzed in this area. The research achievement may give important guidance to the deformation control of foundation pit engineering in Zhengzhou, and it can also be used for reference engineering in similar area.

The Methodology on Building High-fidelity DEM in Road Domain Based on Multi-source Data

ZHANG Longqi, LIU Haiyang, GUO Yunkai, LIAO Bin

2017, 0(7):  113-116,142.  doi:10.13474/j.cnki.11-2246.2017.0235

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The road construction climax of reform and opening up 30 years has become one of the main reasons for the updating of DEM data in road domain. The paper discussed a methodology building high-resolution DEM based on the road design results, remote sensing image data before and after construction from google earth, terrestrial laser scanning point cloud. The demonstration was made based on the data of about 1 kilometer road in Bijie-Douge section of Hangzhou-Ruili expressway. The results showed that it was a feasible, fast and precise method based on the road design results in the road surface and side slope. The research showed that the method had the advantages of high precision, low cost and flexible observation mode, and can be widely used.

Technology Innovation for Integration and Management Underground Pipe Network Spatial Information

CHENG Mianzhi, HOU Yue, ZHANG Jian, FANG Ledao

2017, 0(7):  117-119.  doi:10.13474/j.cnki.11-2246.2017.0236

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This paper proposes to build a system about pipe network information census and information entry, establish and improve the network information relational database, comprehensive pipe network drawing, pipe network information space database, three-dimensional pipe network parts model library and other work. By calling the spatial information and attribute information from different databases, this paper rapidly build three-dimensional network model.Using the technology of MD5 related with the real pipe model and property rights, superimpos on the original surface building (structure) building model, this paper introduces the same space-time reference,develops the ground to build (structure) building management platform, and implements the comprehensive of all kinds of 3D data visualization and dissolve analysis. The system can provide more intuitive decision support in urban underground pipe network management.

Application of RTK in Testing for App-based Ride-hailing Billing System

KANG Tingting, HUANG Yan, XU Yuan, WANG Yajun, LIU Yuan

2017, 0(7):  120-123,136.  doi:10.13474/j.cnki.11-2246.2017.0237

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Since 2013,with the popularity of a taxi software,app-based ride-hailing continuously come into our vision and become active in major cities throughout the country.Subsequently, the customer complaints that positioning are not precise and the calculating mileage is not right. To solve these problems,this paper puts forward a test method of billing for app-based ride-hailing,using multi-mode, multi-frequency RTK GPS carrier phase differential technique and inertial navigation technique,using RTK differential GNSS receiver of base station and flow station,inertial navigation module,high precision of conjugate ring navigation antenna and playback apparatus to record the information such as latitude and longitude,journey time,speed and so on when the car in the process,then it calculates the mileage of the car.By comparing with the results of driver's mobile phone,the results show that using carrier phase differential technique and inertial navigation technique can effectively solve the problem of positioning loss of lock,discontinuous of trajectory and so on.

Research on the Five Planning Integration Platform Based on GIS from the Perspective of Business Collaboration

CHEN Zhen, WANG Meng, ZHANG Dongliang

2017, 0(7):  124-128.  doi:10.13474/j.cnki.11-2246.2017.0238

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In recent years, many cities in China has explored multiple planning integration as a method to establish an integrated spatial planning system. The key for resolving the problem is to improve business collaboration between relative departments. This paper, in combination with Zhuhai's practices, explores business collaboration mechanism including data sharing, collaborative planning, project planning and establishment mechanism based on the research of business collaboration. Based on GIS, this paper also explores the design and realization in building a platform of five planning integration.

Accurate Service of Geo-informatics in Planning Administration

WU Yijie, ZHANG Jian

2017, 0(7):  129-131,146.  doi:10.13474/j.cnki.11-2246.2017.0239

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The reform of our country's government review and approval has been in progress now. Some cities start trying to separate the technical work from administrative work. In this background, Geo-informatics could possibly participate in the whole process of planning administration. Based on analyzing the present situation of planning survey, this paper has discussed how to integrate, mine and utilize the existed survey information in the Geo-informatics system by technical means, to accurately server the planning administration.

A Method for Compensating the Whole Deviation of the Transformation from DDM for Navigation to DDM for Non-navigation

CAO Hongbo, ZHANG Lihua, CHEN Qiu, JIA Shuaidong, LIU Xianpeng

2017, 0(7):  132-136.  doi:10.13474/j.cnki.11-2246.2017.0240

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Aiming at a problem of the model transformation from digital depth model (DDM) for navigation to DDM for non-navigation, the method for compensating the whole deviation is proposed to improve the accuracy of model transformation. First of all, the relationship between the whole deviation of DDM for navigation, submarine terrain complexity factor and chart scale was established. Secondly, the whole deviation of DDM for navigation is obtained by the above formula. Finally, the whole deviation is compensated to the model points of DDM for navigation to improve the accuracy of DDM for non-navigation to which is transformed form DDM for navigation. The experimental results demonstrate:①The proposed method is feasible to improve the accuracy of DDM for non-navigation to which is transformed form DDM for navigation. ②The degree of improvement of the accuracy DDM for non-navigation depends on the submarine terrain complexity factor and chart scale.

Discussion on Cultivating Mode of Multi-level Talents in the Major of Surveying and Mapping from the Perspective of Employment:A Case Study of CUMT

HAN Fushun, WANG Shougang, WANG Yunjia

2017, 0(7):  137-142.  doi:10.13474/j.cnki.11-2246.2017.0241

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As the core factor of the discipline, the cultivating of talents reveals the results of construction. This paper analyzes the employment data of surveying and mapping major in recent 7 years, the result shows that employment rates are all above 97%. Study for the graduate degree in & abroad, work in the private enterprise of this subject and work in state enterprise account for the lion's share of quantity, with each for about a third. The employment areas are mainly in the eastern coastal areas, the northern coastal areas and the middle reaches of the Yangtze River. The development of surveying and mapping face to challenge with opportunity, such as the national strategy, the energy revolution, the reform of higher education, the development of science and technology, and the international cooperation. Structure and direction of cultivating 4-level talents are presented. It suggested that building the world benchmark of mining characteristics in construction of surveying and mapping specialty.

The Transition from the GPS to GNSS Teaching

ZHANG Quande, LIU Xiaoyang, QIAN An, WANG Qiuling

2017, 0(7):  143-146.  doi:10.13474/j.cnki.11-2246.2017.0242

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Over years, "GPS measuring principle and application" has been the core of the surveying and mapping professional courses. As the GLONASS, BDS, Galileo system gradually afford the service,single GPS system has turned many GNSS navigation and positioning system of system integration. Teaching material update is hard to keep up with the development of the GNSS technology.On the basis of the existing teaching materials,how to turn GPS teaching into GNSS. Surveying and Mapping Engineering Research Group of the Institute of Disaster Prevention has carried on the exploration and reform. It is better to deal with the combination of teaching and production, increase the learning content without increasing class hours. A variety of teaching methods are proposed to enable students to master more knowledge and skills. This paper tries to find a shift from GPS for GNSS teaching way.

A Study of Teaching Reform for Engineering Surveying Course Based on the Perspective of Provincial Specialty Evaluation——A Case Study of the Engineering Management Specialty of Liaoning Province

ZENG Wenhai, ZHOU Hongbing, YUAN Bo, AI Songyuan, WENG Zhengzheng

2017, 0(7):  147-151.  doi:10.13474/j.cnki.11-2246.2017.0243

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In recent years, with the continuous improvement of the level of construction industry and the rapid development of engineering surveying technology, the colleges and universities are facing great challenges in the applied talent cultivation of non-surveying majors. Based on the published data of engineering management specialty assessment in Liaoning province, the main problems in the present teaching situation of engineering surveying courses from the perspective of provincial evaluation are studied and analyzed. Then, this paper discusses the teaching reform and puts forward the corresponding reform measures and methods in the future, which provides ideas and ways to improve the teaching quality.