Table of Content

25 May 2017, Volume 0 Issue 5

Previous Issue    Next Issue

Accuracy Evaluation and Analysis of Single Point Positioning with BeiDou and GPS

WEI Erhu, LIU Xuexi, LIU Jingnan

2017, 0(5):  1-5.  doi:10.13474/j.cnki.11-2246.2017.0142

Asbtract ( )   HTML   PDF (3951KB) ( )  

References | Related Articles | Metrics

BeiDou Navigation Satellite System(BDS) has now entered the stage of global networking. In this paper, the mathematical model of BDS/GPS single point positioning is derived in detail. Two schemes are designed by using the data of one single station or twelve stations in the Asia Pacific Region of the MGEX to evaluate and analyse the accuracy of single point positioning with BeiDou and GPS. The mathematical model of single point positioning is verified by experiments. The results show that the accuracy and stability of the combined single point positioning are better than the single system. This paper aims to provide reference for the popularization and application of BeiDou system.

Influence of the Tropospheric Mapping Function on the Accuracy of CMONOC Solution

LIU Zongqiang, DANG Yamin, YANG Qiang, ZHANG Guangru, WANG Jian, YUE Caiya

2017, 0(5):  6-10.  doi:10.13474/j.cnki.11-2246.2017.0143

Asbtract ( )   HTML   PDF (3313KB) ( )  

References | Related Articles | Metrics

The tropospheric mapping function is a function in regard to the height angle and other factors, which has a direct influence on the tropospheric delay correction. This paper introduced NMF,VMF1 and GMF models,used GAMIT/GLOBK calculate the data of CMONOC and some IGS stations around China,compared and analyzed from the aspect of the effects of three kinds of mapping function to the accuracy of CMONOC solution.The results show that the accuracy of the three mapping function models is not very different, and the accuracy is the best when the height angle is 10 degrees.

Analysis of GPS Satellite and Receiver Antenna Absolute PCO/PCV Influence on High Precise Baseline Resolution

HU Yifan, HU Xian, CHEN Junping, HU Congwei

2017, 0(5):  11-16.  doi:10.13474/j.cnki.11-2246.2017.0144

Asbtract ( )   HTML   PDF (4709KB) ( )  

References | Related Articles | Metrics

As one significant error source, the receiver antenna and GPS satellite antenna PCO/PCV must be corrected in high accuracy data processing. In this paper, the influence of receiver antenna and GPS satellite antenna PCO/PCV is analyzed for baseline processing. The result shows that the effects of receiver antenna PCO/PCV for long and very long baseline in components and length can reach 101 mm. The effects of satellite antenna PCO/PCV for long baseline in components and length are in millimeter level, the maximum is less than 4 mm, for very long baseline, the effects in components and length can reach 40 mm.

An Indoor Positioning System Accuracy Evaluation Approach Considering Static and Dynamic Context

LIU Keqiang, CHU Tianxing, BI Jingxue, WANG Yunjia, CHEN Ruizhi

2017, 0(5):  17-20,66.  doi:10.13474/j.cnki.11-2246.2017.0145

Asbtract ( )   HTML   PDF (5294KB) ( )  

References | Related Articles | Metrics

Many indoor positioning systems have been presented to solve the indoor positioning problem. The accuracy evaluation of these systems utilized either static or dynamic method; however, these two methods have their advantages and disadvantages. This paper presents an accuracy evaluation approach to measure the positioning uncertainty which combines static and dynamic method complementarily. The key step in the novel method is setting up a high accurate ground truth positioning system as a reference. The experiment by using the novel approach in assessing a smartphone WiFi/PDR fusion indoor positioning system showed that the new approach can conduct evaluation effectively and obtain enough measurement information for accuracy evaluation.

Research on Indoor Localization Technology Based on WiFi Signal

JIN Chao, QIU Dongwei

2017, 0(5):  21-25.  doi:10.13474/j.cnki.11-2246.2017.0146

Asbtract ( )   HTML   PDF (2399KB) ( )  

References | Related Articles | Metrics

In this paper, we mainly study the triangle positioning method based on WiFi signal indoor positioning technology, in view of the existing model by triangle positioning signal strength and environmental interference, the positioning accuracy is not high, this paper proposes a weight correction model, which is based on the constraints of indoor influence factors. Through the experimental test and data analysis, the accuracy of the corrected model is higher and the applicability is wider.

Slope Deformation Monitoring of Open Pit Coal Mine by GIS Integrated GB-InSAR

LI Ruren, YANG Zhen, YU Bo

2017, 0(5):  26-30.  doi:10.13474/j.cnki.11-2246.2017.0147

Asbtract ( )   HTML   PDF (11835KB) ( )  

References | Related Articles | Metrics

The real-time and accurate monitoring for open pit coal mine slope can provide reliable information for slope stability and early warning, which is directly related to the economic benefit and sustained production. The ground-based InSAR (GB-InSAR), a relatively new technology for deformation monitoring, has been developed in the last ten years, which has the characteristics of all-weather and all day. However, most of the open pit slope deformation monitoring in China are in the experimental stage, which lacks the ability of continuous observation for a long time. In this paper, the basic principle of GB-InSAR is described in detail and the deformation data obtained by GB-InSAR is organically connected with GIS. Deformation information is efficiently, real-time and intuitively displayed by using of GIS powerful spatial analysis and display ability, providing powerful decision support for open-pit mine production.

Using Tilt Images to Build 3D Model and Optimization Model

QIU Chunxia, DONG Qiankun, LIU Ming

2017, 0(5):  31-35.  doi:10.13474/j.cnki.11-2246.2017.0148

Asbtract ( )   HTML   PDF (17866KB) ( )  

References | Related Articles | Metrics

There is less study on obtaining more realistic 3D model how to optimize building concrete segment. By PhotoScan software, the paper puts forward some techniques of 3D model optimization based on discussing key steps of 3D model building in the studied area. For example texture missing, image distortion, data screening, parameters setting and operating sequence, etc.

Research on Co-frequency Interference Noise Reduction Processing of Marine Radar Oil Spill Monitoring

XU Jin, LI Bo, CUI Can, LIU Peng

2017, 0(5):  36-38,74.  doi:10.13474/j.cnki.11-2246.2017.0149

Asbtract ( )   HTML   PDF (3845KB) ( )  

References | Related Articles | Metrics

The marine radar co-frequency interference noise should be processed in the plane coordinate system. Then the convolution algorithm and Otsu algorithm are used to segment the co-frequency interference noise signal in the original data of marine radar. At last, the method of horizontal mean is used to deal with the co-frequency interference noise. This method can reduce the noise of the co-frequency interference noise and preserve the clutter signal. It provides more accurate basic data for the research of oil spill monitoring technology.

Sparse Matching and Dense Matching of UAV Epipolar Images

ZHANG Man, SHEN Shengyu, HU Teng

2017, 0(5):  39-42,55.  doi:10.13474/j.cnki.11-2246.2017.0150

Asbtract ( )   HTML   PDF (5314KB) ( )  

References | Related Articles | Metrics

Converting UAV images to epipolar images, makes a good effect on reducing the search space of corresponding point matching. On this basis, SIFT operator based sparse stereo matching and BP algorithm based dense stereo matching were presented in this paper. The result indicated that:Less corresponding points, simple calculation and accurate spatial coordinates were shown in the results of SIFT operator, so SIFT operator was suitable to acquire summary spatial information in a big-scale area. The computation of BP algorithm was complex but a large number of same points were outputted, which indicated that BP algorithm applied to 3D reconstruction in a small range. In a word, each of them has its own advantages and disadvantages, and they can be complementary.

UAV RS Applied in 3D Reconstruction of Huge Immovable Cultural Relics

YU Bingchen, CHEN Gang, DUAN Miaoran, CAO Feifei, ZHANG Xiao

2017, 0(5):  43-46,61.  doi:10.13474/j.cnki.11-2246.2017.0151

Asbtract ( )   HTML   PDF (4689KB) ( )  

References | Related Articles | Metrics

Aiming at the problem in 3D reconstruction of huge immovable cultural relics, based on UAV RS platform, we use 3D reconstruction based on pictures technique, then design a low cost, quick, high accuracy process for surface exquisite geometry and texture data acquisition and 3D reconstruction. Besides, we research on the problems in this process and evaluate its accuracy and practicability. It shows that the method meets the accuracy requirements of cultural rclics surveying, and we raise a new view for protection and display of cultural relics which can show culturals to audiences totally and closely the 3D reconstruction result has accurate position so it can be used as new data acquisition method and data source of 3D GIS platform.

A Method of Dynamic Target Detection and Tracking Based on Road Constraint Condition

JIAO Jinlong, LU Xiaoping

2017, 0(5):  47-50.  doi:10.13474/j.cnki.11-2246.2017.0152

Asbtract ( )   HTML   PDF (2827KB) ( )  

References | Related Articles | Metrics

As an important part of intelligent city, intelligent transportation is an important guarantee for urban road safety. The difficulty is how to quickly detect and track dynamic targets in road monitoring images with the complex and changeable road background. According to the characteristics of road monitoring video, a dynamic target tracking method is proposed based on the combination of road constraints and color feature sets. Firstly, the moving target search region is determined by road constraints, and HSV color feature set is used for feature matching. Then the background image is updated and the dynamic target is detected based on IIR filtering background method. Finally, tracking and motion forecasting of dynamic objects are realized based on the tracking method which combines the road constraints and color features. The experimental results show that the method can detect and track the moving target accurately. It also has good response ability to the small displacement target and realizes the real-time detection and tracking of the road dynamic target.

A Visual Analysis Method of Urban Public Traffic Network Distribution

ZHANG Jianqin, WANG Pengyu, DU Mingyi

2017, 0(5):  51-55.  doi:10.13474/j.cnki.11-2246.2017.0153

Asbtract ( )   HTML   PDF (4758KB) ( )  

References | Related Articles | Metrics

Visual analysis technology is playing an increasingly important role in the analysis of traffic data and the discovery of traffic problems and decision making. In order to intuitively show the city transit network spatial distribution density, the vector data of Beijing city bus lines is analyzed based on the direct visualization and visualization method of two kinds of aggregation distribution of transit network spatial analysis. The original data processing is calculated for direct visualization of bus lines in Beijing city main roads based on data distribution method. The canvas drawing thermodynamic diagram is used on the original data visualization. The visualization results according to the analysis of the situation of spatial distribution of bus lines in Beijing city show that this method has practical value and significance of city public transportation network planning and optimization.

Application of Distributed Spatial Database in Massive Satellite Images Management

SUN Jing, GAO Jingxiang, SHI Shaoyu, WANG Huibing, AI Bo

2017, 0(5):  56-61.  doi:10.13474/j.cnki.11-2246.2017.0154

Asbtract ( )   HTML   PDF (4396KB) ( )  

References | Related Articles | Metrics

Aiming at the problem that the existing satellite image storage solutions have poor performance in massive image data, this paper gives the analysis of characteristics of the existing satellite image data storage solutions, and puts forward an improved solution based on distributed spatial database to manage the image metadata. This solution utilized file system to store unstructured entity data of satellite image, in the same time, the spatial information and image metadata is stored in distributed spatial database. As a result, it achieves the high performance storage of unstructured image data. ZY-3 satellite image data management experiment has been carried out, and it shows that this solution is of a significant improvement in the query performance of massive satellite image data, and it is suitable for the storage of massive satellite image data.

High Precision Positioning Technology for Long Distance Ocean Engineering Based on BeiDou Satellite Navigation System

LIU Hong, WAN Lijian, LU Yaying

2017, 0(5):  62-66.  doi:10.13474/j.cnki.11-2246.2017.0155

Asbtract ( )   HTML   PDF (3893KB) ( )  

References | Related Articles | Metrics

With the development of long distance ocean engineering project, high precision positioning of BeiDou satellite is greatly needed, the conventional ground based augmentation system and differential transmission can not be implemented in far away sea area. To solve the problem of BeiDou high precision positioning, BeiDou satellite system with short message function is used to broadcast precise point positioning error correction. By sending the observed correction of satellite clock error and ephemeris error of high precision to BeiDou satellite terminal, the remote transmission of the BeiDou satellite correction information is realized, the transmission distance is greatly expanded, no longer subject to geographical restrictions. The positioning accuracy of the BeiDou system is greatly improved, and the application of BeiDou technology in ocean engineering is expanded.

Multi-rotor UAV Aerial Survey Technology for Power Grid Inspection: Research and Application

TANG Jian, YANG Ji, GONG Xuli

2017, 0(5):  67-70.  doi:10.13474/j.cnki.11-2246.2017.0156

Asbtract ( )   HTML   PDF (5006KB) ( )  

References | Related Articles | Metrics

To solve the problems of low positioning precision, difficult control in close inspection, low automation, high risk of man-made control of UAVs power inspection, this paper proposed a multi-rotor UAV RTK differential positioning technology, and machine learning algorithm of UAV Aerial Survey flight rules planning in complex electric tower inspection. Based on this research, it developed a UAV intelligent operating system and control terminals which greatly improved the quality of the normative daily management and emergency command of power network with high convenience and efficiency. The system could provide the low costs, easy operation, high efficiency and mobility new power inspection mode for the power grid management department.

Building Reconstruction Based on Oblique Photogrammetry and SketchUp Secondary Development

ZHAN Zongqian, LI Yihui, GUI Xinyuan

2017, 0(5):  71-74.  doi:10.13474/j.cnki.11-2246.2017.0157

Asbtract ( )   HTML   PDF (8662KB) ( )  

References | Related Articles | Metrics

Combining the advantages of SketchUp including flexible modeling, learnability and high precision of photogrammetry, with using the technology of SketchUp Ruby secondary development, this paper studied on single-image modeling, the communication between photogrammetry module and SketchUp Ruby scripts and the refinement of 3D model. Finally, it solved the key technical problem of hybrid programming of C++ and Ruby to develop SketchUp plug-in.

Analysis and Accuracy Evaluation of Eave Correction Based on Oblique Photography 3D Model

YU Jianren, LI Tao, SHEN Shujuan

2017, 0(5):  75-78,109.  doi:10.13474/j.cnki.11-2246.2017.0158

Asbtract ( )   HTML   PDF (6555KB) ( )  

References | Related Articles | Metrics

3D model, generated by oblique photography technology generally, is usually used as a way to browse the demo nstration. Its usage is simple and crude. Thus, the results are not really applied to each link of conventional surveying and mapping production. This paper studies the accuracy evaluation for method of eave correction based on oblique photography 3D model.On the basis of the exised oblique photography 3D model,we use the facade messy point orthogonal principle to correct the eaves of oblique photography 3D model of residential area. This method provides a kind of intra industry mapping model, which is of great significance to the improvement of topographic map production.

Research on Multi-look Laser Point Cloud Data Fusion and 3D Modeling Method

SONG Yongcun

2017, 0(5):  79-81,94.  doi:10.13474/j.cnki.11-2246.2017.0159

Asbtract ( )   HTML   PDF (2416KB) ( )  

References | Related Articles | Metrics

Based on the point cloud data registration method of feature primitives, this paper uses the control points to roughly match the airborne and vehicle point cloud data, and constructs the feature point matching algorithm model which takes the gradient and color feature and the feature group pair into account. Then, it realizes the accurate registration of airborne and vehicle point cloud data with translation and rotation transformation parameters obtained by fitting the plane feature. On this basis, the technical process of matching the top and facade features of the multi-angle point cloud data fusion, the point cloud data and the optical image texture information are established, and the building (structure) 3D fine modeling is realized, finally the validity of the proposed method is verified by an example.

Accuracy Analysis of Vehicle-borne Mobile Surveying System in Municipal Pipeline Measurement

WANG Yonghong, CHEN Hongqiang, YANG Xiaofeng, LI Jun, HOU Xingze

2017, 0(5):  82-84,99.  doi:10.13474/j.cnki.11-2246.2017.0160

Asbtract ( )   HTML   PDF (3089KB) ( )  

References | Related Articles | Metrics

In the construction of municipal pipelines, topographic map plays a vital role in its planning and design. However, the traditional method has some limitations in topographic mapping of municipal pipeline, especially on important traffic arteries and fast road of cities. Vehicle mobile surveying system has unique advantages due to its fast, efficient and secure properties. The accuracy of the vehicle mobile surveying system is affected by various factors such as speed, ground occlusion, control point arrangement and so on. Experiments in this paper verified the vehicle speed, control points and other aspects. The results showed that the vehicle mobile surveying system can be applied to the topographic mapping about municipal pipeline through a certain quality control measurement.

A Simple Method to Measure the Height of Total Station

LÜ Haibo, DONG Jungui, WU Wei

2017, 0(5):  85-87.  doi:10.13474/j.cnki.11-2246.2017.0161

Asbtract ( )   HTML   PDF (1045KB) ( )  

References | Related Articles | Metrics

The previous achievements were summarized. With the help of universal angle ruler and steel tape, a new method based on the principle of sine cosine theorem was proposed to measure the height of total station. And the influential factors of error were analyzed. The method has high measuring accuracy and applicability. Yet, the topography affection to it is not obvious. It can be used to other similar measuring instruments. The new method has a certain significance to the actual engineering.

Analysis of Population Spatial Pattern of Cooperative Remote Sensing Information and Statistical Information

DONG Zhenzhen, WANG Liang, QIU Agen

2017, 0(5):  88-94.  doi:10.13474/j.cnki.11-2246.2017.0162

Asbtract ( )   HTML   PDF (7212KB) ( )  

References | Related Articles | Metrics

The article analyses the population spatial distribution pattern of the problem of insufficiency. With the aid of remote sensing information and basic information, we quantitatively analyse the spatial heterogeneity of the range area with the introduction of the population geographical concentration, exploratory spatial data analysis and quantitative analysis of the characteristics of geographical weighted regression model. The population concentration index and Moran index effectively reflect the close relationship among the space objects, better evaluate the agglomeration effect in industrial spatial distributron, and reflect the space distribution state. Based on the study area of the Yangtze River economic belt, with the study of spatial distribution of population, it concluded the layers of focus-opposites-the north-south differences-scattered around distribution characteristics, and analyzed the causes from the aspects of economy, society, environment, land use analysis. Thus, it provided a reference for reasonable population growth and resources distribution.

Hill and lake Community Park Location Analysis in Dongguan Based on Taxi GPS Data

LI Haibo, CHEN Tongli

2017, 0(5):  95-99.  doi:10.13474/j.cnki.11-2246.2017.0163

Asbtract ( )   HTML   PDF (5109KB) ( )  

References | Related Articles | Metrics

Location selection issue is one of the most basic tasks in GIS. The general location selection is considered under certain conditions of space optimization, it is difficult to take human activity as the optimization factors into account. This paper proposed a method to improve the community park location selection result by improving the accuracy of population density which is an important factor in community park location selection. We get the population density by analyzing taxi OD (origin and destination) data. Compared with traditional method, this method is innovative and complementory. Combining the traditional location selection method and taxi OD data, we can improve the reliability of the location result more effective and more rational.

Using Secondary Development of AutoCAD to Automatically Find Errors of Elevation Points and Contour Lines in Digital Topographic Map

LIU Hong, HUANG Junsheng

2017, 0(5):  100-104.  doi:10.13474/j.cnki.11-2246.2017.0164

Asbtract ( )   HTML   PDF (3697KB) ( )  

References | Related Articles | Metrics

This paper discusses the possible causes of the elevation point and contour errors in digital topographic map, analyzes the spatial location relationship and the mathematical relationship of the elevation point and contour in the topographic map, with the mathematical relationship working as a judgment condition. It discusses the solutions and judgment rules, and shows the realization of finding out its mistakes'core codes through computer program. This research is very meaningful to reduce the labor intensity of inspection personnel while checking elevation point and contour errors in the digital topographic map so as to improve the working efficiency.

A Batch Assignment Method of Category of Boundary Line Based on FME and Information of Relative Location of Adjoining Parcels

TU Liping, GONG Liangxiong, CAO Qing'an

2017, 0(5):  105-109.  doi:10.13474/j.cnki.11-2246.2017.0165

Asbtract ( )   HTML   PDF (9472KB) ( )  

References | Related Articles | Metrics

In the process of registration of rural land contractual management right, it is necessary to use the existing information of relative location of adjoining parcels to assign the category of boundary line. But most of the data storage software is operated by manual interpretation of the category of boundary line, and then manually entered the category of boundary line into the boundary line attribute table. Manual operation is not only a huge workload, but also inevitably lead to input errors. This paper takes advantage of FME WorkBench 2015 software. Firstly, it extracts the ownership lines of the east, south, west and north of each parcel, and then analyzes the spatial topological relations between the ownership lines and the boundary line of parcel, in order to carry on the batch assignment to the boundary line type. Through the application in the actual production project, it is proved that this method is feasible, practical and effective.

Sparsing Elevational Points Using TIN and Elevational Gradients

CAO Wentao, HE Wei

2017, 0(5):  110-112.  doi:10.13474/j.cnki.11-2246.2017.0166

Asbtract ( )   HTML   PDF (17070KB) ( )  

References | Related Articles | Metrics

In order to solve the elevational points sparsing problem in the series scale topographic map downsizing process, considering the distribution density of elevational points, topography and other factors, this paper took a method for screening and sparsing elevational points based on the points constructing TIN,combined with mean elevation plane, elevational gradient and local extreme elevational points.

Design and Implementation of Building Seismic Hazard Risk Information Platform Based on Map World

LI Fei, SUN Weiwei, ZHANG Shunbao, LI Hui, ZHANG Beilei

2017, 0(5):  113-116.  doi:10.13474/j.cnki.11-2246.2017.0167

Asbtract ( )   HTML   PDF (4894KB) ( )  

References | Related Articles | Metrics

Using the Application programming Interface techniques and seismic hazard risk assessment models, a building seismic hazard risk information platform has been developed with Ningbo city as an example. The platform could carry on much information query such as seismic grades of all buildings and shelters, and also estimate building damage degrees under different seismic intensity. Moreover, building financial loss and casualties can be estimated from the platform, as well as the illustration of seismic popular science. The estimated seismic hazard risk information system could provide more visual and accurate decision-making information to help reducing the building damage and casualties during the earthquake.

Research on the Key Technology of Urban Underground Pipeline Three- dimensional Modeling

LU Dandan, TAN Renchun, GUO Mingwu, LI Pengpeng

2017, 0(5):  117-119,124.  doi:10.13474/j.cnki.11-2246.2017.0168

Asbtract ( )   HTML   PDF (5155KB) ( )  

References | Related Articles | Metrics

With the management, expression and application of urban underground pipeline information from 2D to 3D,in this paper, combined with the construction of three-dimensional model of underground pipeline in Wuhan city, on the basis of a lot of research and practice, some new methods and ideas are put forward for the key technologies of 3D automatic, fast update and integrated modeling of the underground pipelines, to provide a reference for other cities in China to carry out similar work.

3D Modeling of Roadway Intersection and Its Implementation

LIU Xiaoxiao, WANG Yunjia

2017, 0(5):  120-124.  doi:10.13474/j.cnki.11-2246.2017.0169

Asbtract ( )   HTML   PDF (5196KB) ( )  

References | Related Articles | Metrics

Regarding to the difficulties on modeling roadway junction, the single tunnel is modeled by loading section with the centerline of roadway. Besides, a way based on the design parameters to model roadway junction is proposed. On the basis of directly intersecting feature of both roadway junction and horsehead, they are modeled respectively. Finally, the feasibility of the algorithms is verified by C# and DirectX programming practice, and the experiment results are presented in the paper.

Design and Development of Indoor Navigation Map Based on QR Code: The Case of Wuhan University Library

ZHUANG Ying, HUANG Lina, ZHENG Hengjie, LIU Tongshuo, KANG Yuhao

2017, 0(5):  125-128,142.  doi:10.13474/j.cnki.11-2246.2017.0170

Asbtract ( )   HTML   PDF (2364KB) ( )  

References | Related Articles | Metrics

With the increase of large and complex public indoor space, indoor navigation has attracted great attention in the field of location based service. In this paper, we design and develop a navigational electronic map for the complex indoor space based on the spatial location technology and mobile map. For the purpose of obtaining the accurate indoor location, the quick response(QR) code is used, and a set of position coding rules for the complex indoor structures are designed. The library of Wuhan University is used as a sample area in the study. Then a mobile navigation electronic map, which is friendly and easy to provide indoor navigation service as well as to advise the optimal path in the library, is developed and implemented.

Research of Rapid Cartographical Technology Based on Geodatabase in ArcGIS

WANG Min, YU Chenxi

2017, 0(5):  129-131.  doi:10.13474/j.cnki.11-2246.2017.0171

Asbtract ( )   HTML   PDF (2574KB) ( )  

References | Related Articles | Metrics

Geodatabase driven mapping technology based on ArcGIS is introduced in this paper. Taking traffic thematic atlas compiled as an example, it discussed the symbolization of traffic control information and mapping strategy, aimed at realizing fast map printing and output, meeting the requirements of different mapping purpose and cycle, improving the aesthetics and scientificity of information mapping.

Discussion on Updating Method of 1：500 Basic Geographic Information Database

LI Luying

2017, 0(5):  132-135.  doi:10.13474/j.cnki.11-2246.2017.0172

Asbtract ( )   HTML   PDF (8349KB) ( )  

References | Related Articles | Metrics

With the rapid development of city, city appearance is undergoing rapid change.Existing basic geographic information database needs to be updated in a timely manner to ensure the updating of the data and meet the needs of government departments and the public. In this paper,1:500 basic geographic information database fast update data source is introduced,then 1:500 basic geographic information data update method is described mainly,the method of updating 1:500 basic geographic information database by 1:500 topographic map is proposed,and the updating method is verified by an example.Finally, the significance of establishing the updating mechanism of 1:500 basic geographic information database is discussed,which plays an important role in reflecting the urban change and promoting the construction and sharing mechanism.

Geospatial Database Linkage Updating Technique

FU Rongxiang, WU Binzhuo, YE Zhelu

2017, 0(5):  136-138.  doi:10.13474/j.cnki.11-2246.2017.0173

Asbtract ( )   HTML   PDF (1472KB) ( )  

References | Related Articles | Metrics

This paper described geospatial database linkage updating pattern, used in multi-scale, multi-industry geospatial data exchange in Zhejiang. This pattern includes multi-scale cascade updating and multi-industry collaboration updating, and is strongly supported by two key techniques entity level increment updating and geographic entity encoding. Linkage updating guaranteed updating efficiency and consistency of geospatial data in Zhejiang Geospatial Data Exchange.

Linkage Updating Technology of Multi-scale Basic Geographic Data

WU Si, GAO Qianying, LI Liang, HE Xin, YING Guowei

2017, 0(5):  139-142.  doi:10.13474/j.cnki.11-2246.2017.0174

Asbtract ( )   HTML   PDF (4515KB) ( )  

References | Related Articles | Metrics

With the start of dynamic updating of national basic geographic information database, the social development demands for the basic geo-information data are increasing day by day. The traditional multi-scale basic geographic information data update production method is less efficient. This paper proposes a technology based on data linkage updating, update database, feature update rule definition, feature matching and linkage updating. Simultaneously, through the program is developed to form the corresponding system, to apply to the basic geographic information data update production and to achieve good application effect.

New Thinking about the Design of Error Ellipse Teaching Contents

LIU Changjian

2017, 0(5):  143-146,151.  doi:10.13474/j.cnki.11-2246.2017.0175

Asbtract ( )   HTML   PDF (2069KB) ( )  

References | Related Articles | Metrics

Error ellipse is of important practical value and the theoretical basis of significance. In recent years, the application range of error ellipse is expanding, and the part in the error theory and data processing course is more worthy of attention. In order to adapt to the new development, new thinking on the error ellipse of teaching content and design are elaborated, from the positional accuracy and error ellipse, the meaning of the probability of error ellipse and the parameter vector of hypothesis test.

The Reform and Practice for Surveying Instrument Curriculum in Surveying and Mapping Department of College

YU Teng, HU Wusheng, ZHOU Li, JIAO Minglian, SUN Xiaorong

2017, 0(5):  147-151.  doi:10.13474/j.cnki.11-2246.2017.0176

Asbtract ( )   HTML   PDF (6000KB) ( )  

References | Related Articles | Metrics

In view of the actual situation of the continuous development and innovation of the surveying instrument,the effect and social evaluation of the curriculum of surveying instrument in the past five years is summarized. Surveying instrument has entered the era of electronic intelligence, the reform of teaching content according to the theory and practice are put forward, the improvement and innovative teaching methods are found, in turn, the curriculum also seeks to a reasonable assessment methods, and puts forward reasonable suggestions to form a complete set of curriculum related condition, finally, after the reform of curriculum, the teaching effect is discussed and analyzed.