Table of Content

25 August 2018, Volume 0 Issue 8

Previous Issue    Next Issue

Research on Accelerating Convergence Method of GPS/GLONASS Precise Point Positioning

YANG Jiudong, KONG Haiyang, HOU Jinliang

2018, 0(8):  1-5,25.  doi:10.13474/j.cnki.11-2246.2018.0235

Asbtract ( )   HTML   PDF (1938KB) ( )  

References | Related Articles | Metrics

Precise point positioning (PPP) requires a longer convergence time to obtain the steady-state float ambiguities.So,based on the usage of GPS/GLONASS combined PPP to mitigate the problem of excessively slow convergence due to the poor satellite geometry distribution,two methods of applying multi-path combination correction values to PPP model and constructing stochastic models based on multipath combined correction are proposed to reduce the multipath and noise effect.Thereby the PPP convergence speed and stability can be improved.7-day data sets from 108 globally distributed IGS stations were utilized.The results indicated that GPS/GLONASS PPP can reduce the convergence period by 32% in case of equal-weighted pseudoranges for each system,and the weights derived from TEQC multipath observable can reduce that of PPP by 25%.

A New Weight-determining Method Based on GPS for Three-dimensional Surface Deformation Monitoring by Multi-LOS D-InSAR

WANG Zhiwei, LIU Guolin, TAO Qiuxiang, YU Shengwen, WANG Ke, ZHOU Chuanyi

2018, 0(8):  6-10.  doi:10.13474/j.cnki.11-2246.2018.0236

Asbtract ( )   HTML   PDF (1907KB) ( )  

References | Related Articles | Metrics

This paper presents a weight-determining method based on high-precision GPS constraints.In this method,the precision of the multi-LOS D-InSAR deformation observations is evaluated based on the high-precision GPS deformation observations in the same period.Then,considering the influence of system errors and accidental errors on the deformation of a pixel observed by the multi-LOS D-InSAR,a combined fitting model associated with the positions and elevations of a pixel is built.Finally,the precision of deformation from the multi-LOS D-InSAR is evaluated pixel by pixel use the built model,thus determining the weights of observations in the model for resolving three-dimensional surface deformation by the multi-LOS D-InSAR.Authors verify the feasibility and precision of the weight-determining method respectively through a real data experiment based on the case of 2009 L'Aquila earthquake.The results of verification show that the weight-determining method based on high-precision GPS constraints in this article provides reliability for the resolved three-dimensional surface deformation.

Local Geoid Determination Based on Rectangular Harmonic Analysis

LU Yuanqi, ZHANG Chuanyin, JANG Tao

2018, 0(8):  11-17.  doi:10.13474/j.cnki.11-2246.2018.0237

Asbtract ( )   HTML   PDF (3329KB) ( )  

References | Related Articles | Metrics

The establishment of high-precision geoid is one of the important tasks of geodesy.At present,the spherical harmonic analysis and spherical crown analysis are used to establish the local geoid,but it can not get high precision,small area of the earth level.Aiming at the present situation of this study,so rectangular harmonic analysis (RHA) is proposed for regional geoid in this paper.By selecting the point of the regional for the origin to establish the Cartesian coordinate system,and solving the Laplace's equation of gravitational potential in it,then using the simulated terrestrial gravity and aerial gravity data,the method of rectangular harmonic analysis is validated and analyzed.Select the extended parameters,the best truncation method to improve the accuracy of the method.According to the numerical results,it is shown that the accuracy of the 2.5'×2.5' geoid undulations computed from ground and airborne gravity data is 4.2 and 4.3.cm,and for the air neutral data,rectangular harmonic analysis can finish the downward extension and solution process,make the aviation gravity solution directly,and simply.

The Platform Construction Method of GNSS Post Precision Positioning Service Based on CORS

DONG Mingxu, CHU Bin, LIU Ziping, HAO Jianming, KUANG Cuilin

2018, 0(8):  18-25.  doi:10.13474/j.cnki.11-2246.2018.0238

Asbtract ( )   HTML  

References | Related Articles | Metrics

In this paper,a platform construction method of GNSS post precision positioning service which based on internet data encryption pushing and Bernese automatic data solving have been proposed.This method can breakthrough the number of concurrent user requests limit by separating data processing and user services,and can ensure information security by dynamic encryption method to encrypting the positioning results and transmission files.Experimental results shows that,the platform data processing results with better accuracy,timeliness,and stability.Therefore,the platform can provide users with cm to mm-level GNSS post-precision positioning service.

A GPS Height Anomaly Fitting Method in Mountainous Area Based on Ant Colony Algorithm

PU Lun, TANG Shihua, ZHANG Ziping, LI Zongwan, ZHANG Yan

2018, 0(8):  26-31.  doi:10.13474/j.cnki.11-2246.2018.0239

Asbtract ( )   HTML  

References | Related Articles | Metrics

In order to solve the problem that the accuracy of GPS elevation anomaly fitting model can't meet the accuracy demand in the complicated terrain conditions in mountainous areas,the ant colony algorithm combined with the multi-surface function method is proposed.Some feature points are got by using ant colony algorithm and the expression of feature points are elaborated to build a more accurate fitting model.Through analysis of the example,it can be seen that the in-accuracy of the fit points in the study area is 2.5.mm,the overall accuracy of the checkpoints is 4.4.mm,and the accuracy of inside and outside matches is higher than that of the conventional fitting model.The results show that the method of GPS elevation anomaly fitting based on ant colony algorithm was feasible and effective.At the same time,it proves that ant colony algorithm has certain advantages in finding the optimal feature point,which has a good reference value for modeling research.

Using Remote Sensing Identification Multi-feature Line Construction of Tidal Flat DEM

YANG Lijun, WANG Deyu, JIANG Jie, LI Wenmei, SHI Jiafeng

2018, 0(8):  32-36.  doi:10.13474/j.cnki.11-2246.2018.0240

Asbtract ( )   HTML   PDF (1504KB) ( )  

References | Related Articles | Metrics

The error of inversing the tidal flat terrain by waterfront composite technology is large and the economic cost is high.Aiming at this problem,this paper proposed a remote sensing survey method,which is based on vegetation edge,scouring and silting traces,waterfront line and other multi-feature lines with combination of the tidal flat terrain inversion,using the strength of the measured data.Taking the eastern tidal flat of Chongming Island as the research object,the remote sensing technique is used to extract the multi-feature lines such as the waterfront line,the vegetation boundary line and the scouring and silting marks.The trend line method,which is based on measured data is used to assign values to the edge elevation,and take the characteristic lines with elevation information as the spatial interpolation method based on basic data to construct the DEM of the tidal flat by virtue of the GIS spatial analysis technique.Finally,the quality evaluation of DEM inversion results is carried out by using 1:10.000 topographic map and measured data.The results show that this method has the advantages of less demand for DEM images,short time span,low cost,inversion result conforms to the basic law of beach topography,vertical precision which is about 12 centimeters.The results of the study are of great reference value for the analysis of scouring and silting changes,also for the analysis of evolvement rule.

Multiple Solutions of Distance Equations and Nonlinear Least Squares Iterative Algorithms

QI Ke, QU Guoqing, XUE Shuqiang, LIU Yixu, YANG Wenlong, HAN Deqiang

2018, 0(8):  37-40,46.  doi:10.13474/j.cnki.11-2246.2018.0241

Asbtract ( )   HTML  

References | Related Articles | Metrics

Distance observations play a very key role in surveying,of which the related observation model is nonlinear.Because of the complexity of nonlinear problems,observation equations may have a non-unique solution,particularly when the equation is ill-conditioned,the solutions of the equation may become more complex.In view of this problem,the paper uses the direct method and Gauss-Newton method and closed-form of Newton method to solve ill-conditioning,testing the their performances and local convergence of three methods.The result shows that the closed-form of Newton method has the best local convergence.In the experiment,the direct method and Gauss-Newton method can get two solutions,while the closed-form of Newton method can get three solutions two of which are the same with the solutions of direct method and Gauss-Newton method,but,the search total solutions are the best local optimum.

A Calculating and Analyzing Method of National Land Ecosystem Service Values Big Data

CHENG Tao

2018, 0(8):  41-46.  doi:10.13474/j.cnki.11-2246.2018.0242

Asbtract ( )   HTML   PDF (2967KB) ( )  

References | Related Articles | Metrics

A calculating method of national land's ecosystem service values is proposed,which is based on multi-source of remote sensing information,mainly the land cover product obtained in the project of the first Geographic National Conditions Investigation.It analyses the data characters and the big data's engendering process.Combining the classification standard of terrestrial ecosystem in China and the equivalent value factor per unit ecosystem area,the big data calculating algorithm is designed.And Lishui city,Zhejiang province is selected as the study area for validating the calculating method.The results show that the total value of ecosystem services in Lishui city in 2015 is 9.682×10¹⁰ Y,and the per capita is 3.70×10⁴ Y.Specially,forest supplies the most ecosystem service values,followed by water,grassland,farmland,and desert.The research shows that on the basis of multi-source of remote sensing information mainly the land cover product obtained in the project of the first Geographic National Conditions Investigation,high-precision quantification and spatialization ecosystem service values can be calculated and achieved.The big data calculating algorithm has solved the problems of multi-source remote sensing information integration I/O and calculating load in the processing;and the operational efficiency and performance can meet the calculating needs.

A Building Index for Change Detection

WANG Huixian, LEI Chengqiang, YI Chang

2018, 0(8):  47-50,67.  doi:10.13474/j.cnki.11-2246.2018.0243

Asbtract ( )   HTML  

References | Related Articles | Metrics

This study proposes a multi-scale maximum morphological profiles building index for automatic building extraction from high-resolution remotely sensed imagery.The index can solve the following problems:the existing building detecting methods cannot well satisfy the characteristic of high resolution image; it is difficult to distinguish due to the similar characteristics between buildings,roads and bare soil,and so on.The index can well character the building.The index application in the building change detection was taken as an example and experiments were conducted on ZY-3 satellite images.This method achieved satisfactory results.

A Comprehensive Processing Method for Side-scan Sonar Image De-noising and Equalization

WANG Xiao, GUO Jun, ZHU Bangyan, WANG Aixue, QIN Tiantian

2018, 0(8):  51-55.  doi:10.13474/j.cnki.11-2246.2018.0244

Asbtract ( )   HTML  

References | Related Articles | Metrics

In the measurement process of side scan sonar (SSS),it is easily affected by other operating vessels and the factors such as ship speed,wake flow,gain parameter settings.This results in the image influenced by a variety of noise and radiometric distortion.The traditional method is difficult to effectively filter out it,and it is seriously affecting the seabed target recognition for SSS image.According to the characteristics of the SSS image,a novel comprehensive processing method of de-noising and equalization for SSS image is proposed.Compared with the traditional method,the entropy value of the image is reduced and the peak signal to noise ratio (PSNR) is increased,the shape of the seabed target is effectively preserved,and the high-quality acquisition of the SSS image is realized.

Application of Multi-source Remote Sensing Technology in Land Use Classification

MA Teng, LIU Quanming, SUN Hong

2018, 0(8):  56-61.  doi:10.13474/j.cnki.11-2246.2018.0245

Asbtract ( )   HTML  

References | Related Articles | Metrics

In order to improve the accuracy of land use classification and study multi-source remote sensing classification technology,the article analyzes the spectral characteristics and microwave characteristics of land use type such as residential area,arable land,forest,water and unused land.The multi-spectral data GF1 combine with microwave data RADARSAT-2,and the decision tree classifier is used for classifying land use type.The overall classification accuracy of multi-source classification method is 96.6%.The article compares the classification accuracies of the Freeman-Durden three-component method and the multi-spectral method combined maximum likelihood classifier with multi-source method.The results show the multi-source method can achieve complementary of features,and its accuracy is better than multi-spectral method or microwave method.

Orthorectification of High-resolution Remote Sensing Image Based on Google Earth and SRTMGL1

XU Xin, ZHANG Daojun, HOU Xianhui, MA Xiaoyan, WANG Jing

2018, 0(8):  62-67.  doi:10.13474/j.cnki.11-2246.2018.0246

Asbtract ( )   HTML  

References | Related Articles | Metrics

An orthorectified image correction process was proposed in this study based on Google Earth and SRTMGL1 data to address the absence of measured ground control points.Firstly,homonymous point auto-matching was performed between the warp image and the reference image (Google Earth image) in ENVI 5.3 to obtain a horizontal control point file (PTS).Secondly,under the ArcGIS 10.2 platform,Converting the corrected control point data to ArcGIS point file(SHP)according to the X and Y coordinates of the reference points.Finally,the shapefile data was added with elevation values through overlaying with the SRTMGL1,which made it possible to perform orthorectification with ground control points.Compared with the orthorectification without ground control points,the processing flow adopted in this research can effectively improve the accuracy of image correction and lay a good foundation for the subsequent image mosaic.The root mean square error for image is 2.13.m,which meets the technical standard of 1/5000 scale land use investigation.

Urban Cycling Hot Spot Extraction Based on Sharing-bikes' Big Data

YANG Yongchong, LIU Ying, LI Liang

2018, 0(8):  68-73.  doi:10.13474/j.cnki.11-2246.2018.0247

Asbtract ( )   HTML   PDF (3959KB) ( )  

References | Related Articles | Metrics

Under the dual drive of capital and scientific strength,shared bicycles suddenly break into our city and develop rapidly,becoming a part of the urban landscape and an indispensable way of transportation for citizens.However,in the same time,it also brings severe pressure and challenge to the urban traffic operation management and planning development.In this paper,the location data of ofo bicycles in September 20,2017 was obtained by means of Python program.Then,using the ArcGIS traditional analysis tools,the spatial-temporal feature of riding behavior for Xi'an users were analyzed,the hot spots of urban riding were extracted,and the user travel OD model was developed.The results indicated that riding lines had different spatial characteristics under the influence of urban rail transportation,urban industrial distribution,hospital and school distribution and time dimension.The hot spots derived by big data analysis collaborated with the results of comprehensive analysis of visual expression data sets as well as related city data sets makes a new way of thinking for the centralized planning of non-motorvehicle facilities and the optimization for urban spatial layout.

Selection Analysis of Nautical Chart Used in Underwater Terrain Matching Location

LIU Xianpeng, ZHANG Lihua, JIA Shuaidong, SHI Yan

2018, 0(8):  74-77,96.  doi:10.13474/j.cnki.11-2246.2018.0248

Asbtract ( )   HTML   PDF (1639KB) ( )  

References | Related Articles | Metrics

This paper makes a research of under-water terrain matching algorithm based on navigation DDM and presents a basic scale limitation of navigation DDM as reference map.Firstly,an improved under-water terrain matching algorithm based on navigation DDM developed from traditional TERCOM is put forward.Then,two experiment sea areas with different SD (standard deviation) are divided into 100 matching areas,a series of navigation DDM with scale differs from 1:20.000 to 1:200.000 are built.Lastly,terrain matching location experiments are done with different DDM.All the experiments show:①The improved TERCOM can use navigation DDM as reference map to locate;②Navigation DDM with scale larger than 1:20.000 shall be chosen in priority to reduce the probability of error location.

The Determination of the Service Radius of Healthcare Facility Based on Taxi GPS Trajectory

LI Hua, PAN Xiaofang, YANG Lin, WANG Lu, WAN Bo

2018, 0(8):  78-83.  doi:10.13474/j.cnki.11-2246.2018.0249

Asbtract ( )   HTML  

References | Related Articles | Metrics

The service radius study is an important embodiment of the rationality of facility's layout.The defect of traditional research is that the theory-base radius lacks the verification of actual data.In this paper,authors propose a method which analyzes the service radius of the facilities based on taxi trajectory data and then verifies the validity of the method using the tertiary hospital of Shenzhen city.The result shows that the visitors of the tertiary hospital in Shenzhen are mostly within 9.km and 4.km may be a reasonable service radius.From the perspective of the spatial distribution of the healthcare facilities service area in each district,the layout of the tertiary hospital in Shenzhen shows relatively imbalance.However,the spatial distribution of tertiary hospital is not far from that of the population density through centroid analysis.

A Fast Phase Unwrapping Method Based on Interface Propagation

GAO Jian, SHI Lei, XIA Yu, SHEN Peishan

2018, 0(8):  84-87.  doi:10.13474/j.cnki.11-2246.2018.0250

Asbtract ( )   HTML  

References | Related Articles | Metrics

Phase unwrapping is one of the important processing steps of interferometric measurement.With the progress of observation technology,the unwrapping process is also facing new situation,especially for large and massive data processing problems.In this paper,a parallel phase unwrapping method based on interface propagation is proposed.Firstly,the reliability of the data is defined by the residual point and the distribution of the data quality index,and then the absolute phase is calculated according to the reliability value.The realization of the whole process is based on the parallel processing mode of data block,and the operation between the data blocks and the block realizes the interface forward and reverse propagation process.The experimental results of real InSAR data verify the reliability and efficiency of the proposed method.

Geohazard Monitoring Based on Tilt Photography

ZHENG Shifang, LI Zhikun

2018, 0(8):  88-92.  doi:10.13474/j.cnki.11-2246.2018.0251

Asbtract ( )   HTML  

References | Related Articles | Metrics

This paper addresses the needs of pre-disaster warning,disaster assessment,and post-disaster reconstruction and other disaster prevention and rescue work for geological hazards in Guangdong province.Based on the md4-1000 quad-rotor UAV system,this paper explores and studies geological disasters based on oblique photography technology,monitors technical processes and methods and examines the accuracy of their models.Experiments have shown that drones can quickly acquire aerial images with high spatial resolution and multiple angles within a certain range,and based on real-world three-dimensional geohazard warning and monitoring,images captured by drone tilt photography can pass through the airspace.Encryption and absolute orientation establish a real three-dimensional model and real shot images,which can greatly reduce the workload of manual field surveys and improve work efficiency.At the same time,the three-dimensional model of real scenery can be very intuitive to reflect the topographic information of geological hazard hazards.The early warning of disaster hidden points provide a very powerful basis.Through actual measurement data,it is verified that the accuracy of the entire model is better than 0.5 meters,and the plane is better than 0.2 meters.

Simulation of Urban Growth Boundary by the Way of Irregular Neighborhood CA:A Case Study of Dalian Economic and Technological Development Zone

LIU Weiling, ZHANG Yuqing, YANG Jun

2018, 0(8):  93-96.  doi:10.13474/j.cnki.11-2246.2018.0252

Asbtract ( )   HTML  

References | Related Articles | Metrics

Based on the data of land use data and remote sensing data from 2003 to 2012,this paper uses the street as the research scale to develop the elastic boundary and rigid boundary of urban expansion through the irregular neighborhood CA and the ecological suitability evaluation method.The following results were obtained:①The Kappa coefficient is 0.875.8 based on the irregular neighborhood CA model,and the simulation accuracy is required.②The area of the elastic boundary in the study was 230.54.km²,rigid boundary was 260.09.km²,and the area changed significantly.③The construction land shows a trend of expansion from the southeast to the northwest,and the coastal street is more significant than the inland street expansion.

Lane Marking Extraction for MLS Data Based on Space-spectral Feature

FAN Wen, HE Elong, LI Tianqi, SUN Jie

2018, 0(8):  97-101.  doi:10.13474/j.cnki.11-2246.2018.0253

Asbtract ( )   HTML  

References | Related Articles | Metrics

The lane marking is very important for the 3D road scene.Automatic extraction of lane marking in the point cloud scene is of great significance for tasks like the measurement of road width and automatic driving.This paper proposed a space-spactral feature for the extraction of lane marking from mobile LiDAR point cloud.This method fully considers the relationship between color,spatial neighborhood and elevation within lane marking point cloud,which aims to classify the point cloud data and extract lane marking.In order to confirm the effectiveness of this method,a highway scene mobile laser point cloud data with manual labeling is used for the experiments,the training data sets and test data sets are selected for the lane marking extraction experiments.The overall accuracy of road markings extraction is 99.64%,which proves the effectiveness of proposed method.

A Study on County-level Land Use Change of Urbanization Using Land Monitoring Data from Remote Sensing Images:Taking Guangning County as an Example

SHI Shuiyuan, XIE Simei, XIE Rongan

2018, 0(8):  102-105.  doi:10.13474/j.cnki.11-2246.2018.0254

Asbtract ( )   HTML  

References | Related Articles | Metrics

The rapid economic development and urbanization in the Pearl River delta region drive the development of surrounding cities.This paper uses the land survey data which were obtained by high resolution remote sensing images from 2011 to 2017 to analyze urbanization of Guangning county,the nearest mountain county to the Pearl River delta.It reflects the urban expansion degree through calculating several indicators and finds out the source of the new urban land in each year.Meanwhile,the landscape distribution of the various types in the county district of Guangning county is analyzed by calculation of the landscape index.Finally,we explore the changing demand of land during the period of urbanization and seek out the optimizations of urbanized land in mountain county.

Numerical Simulation of Remote Sensing Scale Effect:A Case Study for Leaf Area Index

OU Shenghua, SHAO Shanshan, YANG Tao, YI Chuanxiang

2018, 0(8):  106-110.  doi:10.13474/j.cnki.11-2246.2018.0255

Asbtract ( )   HTML  

References | Related Articles | Metrics

The existence of scale effect has seriously limited the development of quantitative remote sensing applications,which restricts the improvement of quantitative remote sensing inversion and becomes one of the hot issues to be solved urgently.In general,there are many theories to analyze the scale effect of the Taylor series from mathematics,but less from the visual simulation of remote sensing data.In this paper,we use the airborne WIDAS data from the leaf area index (LAI),and introduce the Lorentz curve to express the heterogeneity of the surface variables (i.e.,Normalized Difference Vegetation Index (NDVI)).Based on the LAI inversion model with different nonlinear degree and the scaling up aggregation method,the cause of scale effect is analyzed.It is found that the scale effect is the comprehensive representation of spatial heterogeneity and inversion function nonlinearity,and the increase of spatial heterogeneity and the nonlinear degree of inversion function will lead to the increase of scale effect.

The Impact of Urban Architectural Horizontal Characteristics on Urban Thermal Environment:A Case Study of Zhongshan District,Dalian

SU Junru, LÜ Fang, YANG Jun

2018, 0(8):  111-114.  doi:10.13474/j.cnki.11-2246.2018.0256

Asbtract ( )   HTML  

References | Related Articles | Metrics

The correlation of spatial variation in surface temperature with building density in Zhongshan district,Dalian city is investigated over the period 2002-2014.This paper utilizes remote sensing data and multi-source land use data,which evaluates using a combination of single-window algorithm and correlation analysis.The results show that during 2002-2014,most of the high-temperature grid cells distribute along Jiefang Road and Zhongnan Road and thenorthwest part of Zhongshan district,and the temperature increases obviously.The temperature increases significantly after an area of land in the northeastern part of the district is reclaimed from the ocean.The high density and relatively highdensity plots are distributed mainly in the commercial district of Qingniwa-Tianjin Street.Most of the low density,relatively low density,and mediumdensity plots are distributed along Jiefang Road and Zhongnan Road.Surface temperature shows moderate correlation with building density (0.514 and 0.537,in 2002 and 2014,respectively).

Big Data Organization Method of GIS Spatio-temporal Expanded the Streaming Data Cube

LU Yanling, LI Jingwen, YE Suxian, JIANG Jianwu, YIN Min, ZHOU Yanliu

2018, 0(8):  115-118.  doi:10.13474/j.cnki.11-2246.2018.0257

Asbtract ( )   HTML  

References | Related Articles | Metrics

Aiming at the problem of multi-source heterogeneous dynamic and data storage optimization for large-scale data faced by big data GIS,this paper studies geographical spatio-temporal data organization and model under the background of big data,proposes an extensible cube handing framework based on stream data,on the typical two-dimensional data sequence of stream data,constructs a data cube that increases the vertical direction to manage the unstructured data.Combining the definition and characteristics of the data cube model,this paper discusses the organization method of GIS spatio-temporal big data by extending relational database and cooperating non-relational database.Simultaneously,by extending the data sources,data types and data manipulation,this paper highlights the characteristics of spatio-temporal relationship and evolution process in the multi-source heterogeneous big data,and then,the data of spatio-temporal big data is organized,stored and analyzed together.In the end,this paper addresses the technical bottleneck question of large volume,heterogeneity and dynamic for spatio-temporal big data in GIS data management and analysis.Also,it provides scientific methods and solutions to effectively manage GIS spatio-temporal big data.

Research on Road Network Updataing and Trajectory Integratory Based Trajectory Data

HUANG Yaohui, FAN Wentao, LIU Liuyang

2018, 0(8):  119-123.  doi:10.13474/j.cnki.11-2246.2018.0258

Asbtract ( )   HTML  

References | Related Articles | Metrics

With the rapid development of economy,the updating frequency of urban road network has increased rapidly.Road network data is of great significance for traffic planning and urban development.In this paper,a road updating approach based on GPS trajectory data is proposed.Firstly,the geometric shortest distance analysis and hidden Markov model analysis are used to extract the mismatched trajectory.These mismatched trajectories indicate road segments previously not available and include key information of the newly built road.To build new road network,the skeleton line of the new road is extracted by combining the Delaunay triangulation and the ridge line.Then the skeleton lines are simplified and extended to make the incremental update to the existing road network.The experimental results show that the combination of Delaunay triangulation and ridge line based on newly build trajectories can improve the generating efficiency of new roads and improve the updating effect of road network.The method indicates that the proposed approach can be used for incremental updating of large-scale road network.

Comprehensive Analysis of Urban Road Importance Evaluation Methods

WANG Qingguo

2018, 0(8):  124-127.  doi:10.13474/j.cnki.11-2246.2018.0259

Asbtract ( )   HTML  

References | Related Articles | Metrics

Aiming at the basic problem of the evaluation of urban road importance,based on the complex network theory,this paper gives a comprehensive research on the existing main evaluation methods,which includes the basic forms of road,the expression of road network,the index system of road importance evaluation,and the evaluation model of road importance.Then the problems of the existing evaluation methods are analyzed.Finally,based on the problems of the existing methods,as well as the development and changes brought about by the current scientific and technological progress,the directions that can be in-depth in the research of the evaluation methods of road importance are discussed.

Research on “Internet Plus” Expressway Toll Mode

XIE Fengzhu, WANG Jianmin

2018, 0(8):  128-130,144.  doi:10.13474/j.cnki.11-2246.2018.0260

Asbtract ( )   HTML  

References | Related Articles | Metrics

The ETC has been vigorously promoted in the national highway toll.For some of the problems found in the operation,the paper researches and designs the highway toll collection system based on Internet plus ITC (internet toll collection),and comprehensive applies mobile Internet technology,mobile GIS technology,BDS positioning technology,license plate recognition technology,image recognition technology,mobile payment technology,implements the registration of the vehicle and the audit by the mobile APP technology,pays tolls by mobile.Thus,the purpose of the vehicle to pass the highway without parking fee is realized.

Comprehensive Display Design of the Great Wall's Cultural Landscape Based on Virtual Environment

LI Yiwei, ZHAO Hongrui

2018, 0(8):  131-135,149.  doi:10.13474/j.cnki.11-2246.2018.0261

Asbtract ( )   HTML  

References | Related Articles | Metrics

The Great Wall is an immense carrier of Chinese civilization and a world-renowned culture heritage. How to make use of modern new technology to make more people know,understand,and experience the Great Wall more comprehensively and deeply is an important content in protecting and publicizing the Great Wall. In this paper,various techniques such as geographic information,internet,panoramic photography,multimedia and virtual scene are integrated to display the cultural heritage,historical sites,environmental landscape and cultural values of the Great Wall,which provide an immersive experience for the audience and explore a new model for the Great Wall's tourism promotion,value exploration and discovery,protection and utilization.

Construction and Application of Digital Fuzhou Geographic Information Public Platform

WANG Lingyan

2018, 0(8):  136-141.  doi:10.13474/j.cnki.11-2246.2018.0262

Asbtract ( )   HTML  

References | Related Articles | Metrics

The digital Fuzhou geographic information public platform is an important part of the digital Fuzhou geospatial space framework.The platform integrates the information of nature,society,economy,population and environment in the regional integration area,achieving the integration of regional information resources,which provides geographic information and decision analysis for the government departments,and provides comprehensive information service for the unit enterprises and the general public.Firstly,this article introduces the overall architecture of the digital Fuzhou geographic information public platform,and then expounds the main construction content of the platform.Finally,based on the achievements of the platform construction,the project has been applied in many fields,and the application effect is remarkable.

Establishment of Control Network Outside New Yongshouliang Tunnel on Yinchuan-Xi'an High-Speed Railway

LI Jinxiang

2018, 0(8):  142-144.  doi:10.13474/j.cnki.11-2246.2018.0263

Asbtract ( )   HTML  

References | Related Articles | Metrics

This paper discussed the method to adopt high-precision GPS as the control network for long and large tunnels. So that the stability of the network structure of the control network outside the tunnel can be enhanced and that the tunnel piercing accuracy can be improved.

Research on Application of Cultural Heritage Modeling Based on 3D Laser Scanning

YU Peiyong, LIU Zhaohua

2018, 0(8):  145-149.  doi:10.13474/j.cnki.11-2246.2018.0264

Asbtract ( )   HTML  

References | Related Articles | Metrics

In recent years, a large number of cultural heritage damages have occurred at home and abroad. In this case, the cultural heritage needs to be digitally modeled for regular repair. Taking the former residence of Zhu De as an example, this paper elaborates the detailed digital modeling process of ancient architecture based on 3D laser scanning technology by combining 3D laser technology and close-range photogrammetry technology, and provides an example for further research on cultural heritage modeling. Mainly through the following steps:This paper obtains data by using Trimble TX8 (including acquisition of image data and point cloud scan data). Then, it uses Trimble RealWorks to preprocess data (including data registration, culling, data resampling). Finally, it uses 3ds MAX Photoshop to produce 3D model (including repairing point cloud voids, making CAD drawings, plain mold making, texture mapping, and post rendering). Through this research, it is found that the use of close-range photogrammetry technology combined with three laser technologies can perfectly repair the damaged part, and the model can be clearly established by splitting the component to improve efficiency.

The Application of UAV Aerial Photography in Measurement of Xiashan Reservoir

WANG Jie

2018, 0(8):  150-152.  doi:10.13474/j.cnki.11-2246.2018.0265

Asbtract ( )   HTML  

References | Related Articles | Metrics

The Xiashan reservoir is located in the Shandong peninsula in China,also known as the Xiashan lake.There are beautiful scenery,pleasant climate with a lot of trees,flowers and other plants in reservoir area.It is a comprehensive natural place which is a collection tourism,vacation,sightseeing and leisure.So,how to effectively develop the reservoir and develop more resources on the basis of the present stage,you need to measure with the application of advanced technology.Among them,the UAV aerial photography technology is more advanced technology at present.So,in order to understand the application of the technology better,in the article of UAV aerial technology in the applications of xiashan reservoir measurement,related content has been analysed and discussed in detail to provide certain help for the related technical personnel in the practical work.

The Three Dimensional Reconstruction of Substation Based on Oblique Photogrammetry

ZHENG Yongfeng, WANG Zhijun

2018, 0(8):  153-155,163.  doi:10.13474/j.cnki.11-2246.2018.0266

Asbtract ( )   HTML  

References | Related Articles | Metrics

This article analyzed the components of UAV aerial photography system,flow of data acquiring and data processing in oblique three-dimensional real scene model.Taking one substation for example,experiment on three-dimensional real scene model reconstruction of substation based on oblique photogrammetry was introduced,as well the data accuracy was analyzed. Experimental results show that the study not only described an efficient way for the 3D reconstruction of substation,but also provided 3D visualization technical support for maintenance,monitoring,training of substation.

Application of Non-GCPS UAV in the Engineering Surveying

REN Bin, GAO Limin

2018, 0(8):  156-159.  doi:10.13474/j.cnki.11-2246.2018.0267

Asbtract ( )   HTML  

References | Related Articles | Metrics

With the continuous development and use of modern technology, surveying and mapping technology has been greatly developed. Modern digital surveying and mapping technology is becoming more and more intelligent, and more and more technologies are applied to the measurement of earth and stone. More and more people pay more attention to the measurement and calculation of earth and stone.The traditional measurement methods include visa records, RTK measurements. But the credibility of visa records is uncertain, and RTK measurement takes a long time. Then the consumption level UAV modeling method is used to estimate the volume of earthwork, which has the characteristics of short time data acquisition, strong operability and low investment. In this paper, the application of Sirius PRO (Sirian) fixed wing UAV platform and Virtual Surveyor software for the large scale topographic map of 1:500 is discussed and analyzed.

Application of Airborne LiDAR Technology in Highway Construction:Taking the Karakoram Highway as an Example

HE Chengcheng, HE Wei, ZHANG Lunning, DU Yanxin, WEI Yutang

2018, 0(8):  160-163.  doi:10.13474/j.cnki.11-2246.2018.0268

Asbtract ( )   HTML  

References | Related Articles | Metrics

Airborne LiDAR technology was used in the topographic mapping process of the Karakoram Highway. We accumulated experience in using airborne LiDAR technology in road construction. Airborne LiDAR technology can improve the quality and efficiency of highway construction, and it is of great significance for expanding the application of airborne laser radar technology.