Table of Content

25 May 2018, Volume 0 Issue 5

Previous Issue    Next Issue

Overview of Precise Time and Frequency Transfer Technology

HE Ting, CHEN Guojun, MA Jialin

2018, 0(5):  1-5.  doi:10.13474/j.cnki.11-2246.2018.0133

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Precise time and frequency transfer technology plays an important role in many fields currently.And it is also one of the key technologies for the establishment and maintenance of UTC (coordinated universal time) and TAI (international atomic time).In this paper,three major precise time and frequency transfer technologies are studied.The results show that the satellite time and frequency transfer technology has been most maturely and most widely used,while it also faces the challenges in performance improvement,security and environmental suitability.Optical fibers time and frequency transfer technology take advantage of optical fiber transmission technology and achieves high performance.But it can be easily affected by temperature as well as has some limitations in range,cost and flexibility.Laser time transfer technology is based on satellite laser range technology and mainly used in performance enhancement of satellite navigation system.However,it has very limited applicability because of its speciality.The study of this paper can help to develop national time and frequency system with high precision,high stability,high reliability and security.

Spatial Resolution Determination for Grid Zenith Tropospheric Delay Using Non-negative Matrix Factorization Algorithm

LIU Zhiping, ZHU Dantong, WANG Qianxin, WANG Jian

2018, 0(5):  6-10,19.  doi:10.13474/j.cnki.11-2246.2018.0134

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Zenith Tropospheric delay (ZTD) is one important error in high precise GNSS positioning,which is generally removed using GGOS Atmosphere grid ZTD products (spatial resolution is 2°×2.5°).At present,the spatial resolution of grid ZTD products was determined according to experience.However,it is insufficient data demonstration.This paper studied spatial resolution determination for grid ZTD products using dataset including GGOS ZWD,ZHD and ECMWF (0.125°×0.125°) precipitable water vapor (PWV),surface pressure (SP).Then,the probability statistics of absolute ZTD gradient value was calculated along latitude and longitude respectively,and spatial feature dimension of grid ZTD was extracted by the improved NMF algorithm based on random learning rate matrix.So,the reasonable spatial resolution of the grid ZTD products is determined,and a data compression product scheme is provided.

Studies of the Orbit Combination and Its Precision Evaluation Based on the Production of IGS Analysis Center

LU Yicai, GAO Chengfa, GUO Qi

2018, 0(5):  11-15,34.  doi:10.13474/j.cnki.11-2246.2018.0135

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In view of the stability of the framework and orbital products of IGS Analysis Center,an integrated trajectory algorithm based on IGS Analysis Center product is proposed.The self-assembly algorithm is used to synthesize the precision orbit of IGS Analysis Center from GPS week 1938 to 1944 and obtain GPS combination orbit.Experimental results shows that in all of Analysis Center,NGS,GFZ,CODE and ESA have better accuracy on their orbit products,while the remaining relatively poor.And it is proved that there are frame differences between the Analysis Center orbit and the final orbit presented by IGS.Compared with IGS final orbit,the difference of 3D RMS on combined orbit are less than 5 mm.The feasibility of this algorithm is proved by using the algorithm in paper.

A SINS/GPS Integrated UAV Location Algorithm Combined with H^∞ Filter

WANG Kunlun, TAO Tingye, HUANG Zuoji, WANG Chunlin

2018, 0(5):  16-19.  doi:10.13474/j.cnki.11-2246.2018.0136

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In the high dynamic complex environments of UAV mobile positioning,the SINS system may have error drift and the GPS signal may interrupted.Study on rotorcraft UAV positioning,a method for measuring precise position information of target by UAV based on the velocity and position information is given.Using H^∞ Filter algorithm for fusion of measurement data,the method has the merits of GPS and SINS positioning technology and further reduces the positioning error,especially suitable for long time navigation.Experiment results show that:When H^∞ filtering is introduced into the combined navigation and positioning,that can improve the convergence of the filter,but also to maintain high accuracy of positioning.

Prediction of Ultra-rapid Ephemeris Clock Error Based on EEMD

MAO Ya, WANG Qianxin, HU Chao, ZHANG Mingbin, YU Weixuan

2018, 0(5):  20-24.  doi:10.13474/j.cnki.11-2246.2018.0137

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In order to improve the prediction accuracy of BeiDou satellite clock offset, a module is applied to predict the clock offsets of BeiDou satellites using polynomial and EEMD. And the correctness of the module is verified by GPS data. After removal of trend items, obtaining the time series with different frequencies by decomposed residuals using EEMD. On the linear combination of the prediction value by different module, and the final clock offsets prediction value is combined by prediction value of the trend and the sub-time series. The experiment shows that, the module has achieved a good results in predicting BeiDou satellites clock offsets, and the accuracy increases between 7.3%~43.0% compared with ISU-P.

Application and Precision Analysis of Local Phase Correlation in Dense Matching

ZOU Jingui, YANG Yihui, LI Qin, ZHAI Ruoming

2018, 0(5):  25-28.  doi:10.13474/j.cnki.11-2246.2018.0138

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Traditional phase correlation algorithm is widely used in image registration and mosaicking.Based on the windowed Fourier transform of binocular stereopair,this paper realized the local phase correlation in image,and got the sub-pixel translation parameters between the windows by obtaining the cross-correlation power spectrum using the local phase correlation method,so as to calculate the disparity at the center of the window.The experimental results show that the proposed algorithm with appropriate window size has higher matching accuracy and strong robustness to random noise and illumination changes.

Line Segment Matching Based on Geometric Constraints and Gradient Descriptor

WANG Jingxue, ZHANG Xue

2018, 0(5):  29-34.  doi:10.13474/j.cnki.11-2246.2018.0139

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Aiming at the reliability of line segment matching under the condition of non-constraint,this paper proposed a line matching algorithm based on geometric constraints and gradient descriptor.Based on the corresponding points and straight line extraction results,the algorithm firstly determined the candidate lines by corresponding triangulations and epipolar constraints.Secondly,it determined the overlapping of the candidate line which corresponding the reference line based on the epipolar of reference line endpoints.Thirdly,based on corresponding overlapping segments,it established straight line parallel support region for reference line and candidate line respectively,and then constructed gradient magnitude mean-standard deviation descriptor with Gaussian convolution.Finally,the corresponding line was determined by Euclidean distance in descriptors and nearest neighbor distance ratio.Experimental studies are carried out with different kinds of images,and the results show that the proposed method is reliable for line matching.

Study on Data Acquisition and Registration Experiment of Terretrial Laser Scanning Point Clouds under Complicated Banded Terrain Condition

YANG Min, GAN Shu, YUAN Xiping, GAO Sha, ZHU Zan, YU Hui

2018, 0(5):  35-40.  doi:10.13474/j.cnki.11-2246.2018.0140

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

The spatial coordinate system registration processing for terrestrial scanning point cloud data obtained from the multi-site erections is the data preprocessing key technology to achieve the surface 3D model. In this paper, the registration accuracy of the 3D scanning point cloud data was studied. Based on the different modes of the data acquisition in scanning settings, the independent site acquisition and matching mode based on certain scanning overlap, the acquisition and matching mode based on the site GPS coordinates control and the backsight acquisition and matching mode based on the total station measured coordinates of the site were disigned. Three kinds of test programs, carried out for different scanning programs under the point cloud data obtained by the registration processing method analysis and precision comparison analysis. Then analysis and precision analysis of the registration methods for point cloud data obtained under different scanning schemes were carried out. The results of different schemes applied to point cloud data acquisition and registration with ribbon test area showed that, compared with the independent site acquisition and matching mode, the latter two acquisition modes, namely, the acquisition and matching mode based on the site GPS coordinates control and the backsight acquisition and matching mode based on the total station measured coordinates of the site, which showed a clear advantage due to overcome the difficulties with the global coordinate system conversion and the target dependence and so on, so they had higher data acquisition and matching efficiency.The research results can provide reference for the out field data acquisition about same type of equipments on the ground 3D laser scanning system and point cloud registration.

Uncertainty Analysis for Slope Extraction Based on Python

WU Nei, LI Chaokui, FANG Jun, CHU Nan, WU Baiyan

2018, 0(5):  41-47.  doi:10.13474/j.cnki.11-2246.2018.0141

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Taking DEM with spatial resolution of 30 meters as experimental data source,the uncertainty of slope extraction is deeply studied by using Python geographic modeling technology.The general level of slope is to be represented by the average slope,and the study area is divided into 7 landscape types,the 30 m resolution of DEM data is resampled into 10 groups DEM data of 30~120 m resolution.Using ArcGIS platform and Python development language based geographic modeling technology,quantitative analysize DEM spatial resolution,mean slope and area geomorphic features,the uncertainty of slope extraction is studied.The research results show that the average slope region in different geomorphic regions are extracted with decreasing resolution of DEM decreases,the decay rate is basically unchanged.The regression equation of the constant term and the geomorphic unit is characteristic of the two gully density curve.

Spatiotemporal Evolution of Landscape Pattern in Mining Cities: A Case Study in Panji District of Huainan

YU Weixuan, MAO Ya, LIU Yue, LIN Meng, XIAO Rui

2018, 0(5):  48-53.  doi:10.13474/j.cnki.11-2246.2018.0142

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Based on the theory of landscape ecology and combining the RS and GIS,this paper analyzes the dynamic changes of land use and the spatiotemporal evolution characters of landscape pattern in Panji district in recent 10 years,through the remote sensing images in 2005,2009 and 2013.The results show that the area of construction land in Panji district has increased significantly from 2005 to 2013,and the landscape diversity has a decreasing trend over time.Due to the influence of human activities such as coal resources exploitation in the study area,a large amount of goaf water has appeared,which makes the landscape pattern change very complicated.This paper attempts to explore the general pattern of the change of landscape pattern under the influence of human activities in mining cities,and provides reference for urban planning and scientific decision-making in relevant government departments.

Remote Sensing Identification of Heavily Polluted Water in Urban Areas

LI Jiaqi, DAI Huayang, LI Jiaguo, ZHU Li, ZHOU Yaming

2018, 0(5):  54-58,140.  doi:10.13474/j.cnki.11-2246.2018.0143

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

The remediation of polluted water is of great significance to the good water environment of the city.Based on the formation mechanism of polluted water,the remote sensing identification model of polluted water bodies is constructed,and the rapid and efficient extraction of polluted water bodies is realized.This paper takes Yinchuan city as the study area to carry out the remote sensing identification of Yinchuan polluted water and field validation.The verification results show that the remote sensing identification accuracy of polluted water can reach 62.96%,which can be used to identify twelve polluted waters in Yinchuan City,which will provide references for the remediation of polluted water in Yinchuan.In order to improve the remote sensing accuracy of polluted water recognition,we also analyzed the reasons that affect the accuracy in this paper.Since it is the first time for the remote sensing to identify polluted water,the identification accuracy is not high.After the research work,we will continue to study other indicators to improve the accuracy.

Ground Points Recognition and DEM Extraction Based on DSM in Complex Terrain

YU Longhua, WANG Leiguang, WU Nan, LIAO Shengxi, ZHANG Huaiqing

2018, 0(5):  59-64.  doi:10.13474/j.cnki.11-2246.2018.0144

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

At present,researches of the extraction of DEM focused on DSM are mostly based on the flat areas,and the precision of extracting DEM is low.Therefore,in this article,a DEM extraction algorithm based on regional growth is proposed and implements ground points recognition and DEM extraction form DSM in complex terrain.The algorithm uses the maximum interclass variance (OTSU) to realize the adaptive selection of seed points,and growth criterion,and termination condition in regional growth.This method identifies the elevated road from the city DSM data to avoid that the regional growth algorithm wrongly divides the elevated road into the ground because of the continuity between the elevated road and the ground.By comparing with the method of local minimum,the results show that the proposed algorithm can improve the accuracy of DEM extraction,and the mapping precision of ground points recognition exceeds 90%,and experimental results demonstrate that the effectiveness of the proposed method is reliable and steady.

Business Flow Processing System Applied for GF1 High Resolution Satellite Imagery

SUN Yushan, AI Haibin, HAN Xiaoxia

2018, 0(5):  65-70,135.  doi:10.13474/j.cnki.11-2246.2018.0145

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Multiple imaging modes such as high time resolution, high space resolution, hyperspectral and high overlaps acquire mass data for surveying and mapping, and also bring new challenges for image processing technology. In this paper, based on the features of the GF1 satellite imagery and the research of high resolution satellite imagery processing algorithm and key technology of automatic processing flow, we proposed a C/S architecture based business flow processing system for the GF1 high resolution satellite imagery. The system supports the heterogeneous computing of GPU and CPU and can customize the business flow accroding to the different demands of the satellite imagery production, the system is able to improve the automation and business flexibility for the high resolution satellite imagery processing. To verify feasibility of the system, we show several experiments about the production of the satellite imagery products. The results show that the proposed business flow system has the capability of massive parallel processing for GF1 satellite images based on the different business demand, and reducing the manual intervention while producing the correcting imagery and thematic imagery.

An Error Model of Pylons Tilt Monitoring Using Horizontal Section Method

CAI Lailiang, WANG Shanshan, YUAN Guanglin, GU Shudan, SONG Deyun

2018, 0(5):  71-76.  doi:10.13474/j.cnki.11-2246.2018.0146

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Aiming at the inclination monitoring method of the high-voltage tower based on three-dimensional laser scanning technology,the inclination principle of high-voltage using the offsets of the horizontal-split dough center and the source of error are analyzed.The research shows that the amount of inclination error of the tower is mainly related to the tilt amount and the asymmetry of the upper and lower.Based on the formula,the tilt error correction model on the main inclined profile is established,and the special point cloud data processing software is developed.With the example of the inclined high-voltage tower in the mining area of in Shanxi province,the inclination value of the tower is calculated by this method.The results are compared with that of the feature point method,and the validity and accuracy of the algorithm and data processing program are verified.The research of the correction of errors in this paper has a strong meaning reference about tilt measurement of the asymmetric higher-smaller structure,such as chimneys,towers,measured by laser scanning technology.

An Improved Trajectory Map Matching Algorithm

DUAN Zongtao, HUO Mingsheng, KANG Jun

2018, 0(5):  77-81.  doi:10.13474/j.cnki.11-2246.2018.0147

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

With the dramatic increase of the number of GPS trajectory data,the algorithm of map matching is also put on a severe challenge.At present,the existing map matching algorithm is hard to achieve high accuracy for the roads with relatively complex sections and GPS data with low-frequency.In this paper,an improved HMM-based map matching algorithm is proposed,which is improved when solving the shortest path distance.Compared with the traditional HMM algorithm,the experimental results show that the proposed algorithm has a higher accuracy.

Technical Status and Development Trend of Deep-sea Multi-beam Bathymetry System

ZHANG Tongwei, QIN Shengjie, TANG Jialing, WANG Xiangxin

2018, 0(5):  82-85.  doi:10.13474/j.cnki.11-2246.2018.0148

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Multi-beam bathymetry system can give dozens or even hundreds of depths in a plane vertical to the track one time,and obtain a full-depth water depth swath with a certain width,thus it greatly improves the oceanographic surveying efficiency.The basic principle of multi-beam bathymetry system is introduced in brief.Then the deep-sea multi-beam bathymetry systems of L3 ELAC Nautik,Teledyne(ATLAS),and Kongsberg are systematically introduced,and domestic development is also analyzed.Finally,the development trend of deep-sea multibeam bathymetry system is prospected,such as higher bathymetry resolution and accuracy,larger coverage,stronger water column profiling and more convenient data processing.

Research on Methods for Products Properties Evaluation of Wide Area Differential System

WANG Xiaoqing, WU Junli, CHEN Ming, SONG Weiwei, ZHANG Dong

2018, 0(5):  86-89.  doi:10.13474/j.cnki.11-2246.2018.0149

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

At present,the wide area differential(WAD)positioning is a cutting-edge issues for application of satellite navigation system,which can provide sub-meter or even centimeter-level accuracy real-time positioning,and the comprehensive evaluation of the products is critical for users.In this paper,a real-time product evaluation scheme is designed,based on the precision orbit,clock,and ionospheric product of wide area differential system.The scheme solves the key problems for real-time product quantitative evaluation,and realizes the automatic monitoring for the product continuity,timeliness,effectiveness and real-time positioning,as well as the automatic post analysis of the product accuracy.The paper provides quantitative reference index of real-time product properties for wide area differential users.

The Method to Improve the Accuracy of Dynamic GPS Elevation by Combining Multiple GPS Observation

SUN Jiabing, HE Xue, ZHANG Ligong

2018, 0(5):  90-92.  doi:10.13474/j.cnki.11-2246.2018.0150

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

The appearance of RTK (real-time kinematic) technology equips the GNSS to be an irreplaceable role in the field of measurement.At the same time,with the update of the GPS receiver,multiple GNSS systems can now support hybrid reception and combined solution.Thus,the efficiency and precision of GNSS have been greatly improved.At present,the precision of dynamic calculation for GPS RTK has arrived at the subcentimetre level.It can be used in many high-precision measurement and construction fields,such as butt joint of submerged tube the undersea,high speed railway measurement and so on.But in the construction of high precision dynamic installation,the positioning of single GPS RTK often faces the problem of accuracy and reliability.Based on the real instance of large caisson construction of marine works undersea,the paper will bring forward a method,focusing on how to improve the accuracy and reliability of dynamic GPS,by making use of the feature of the multiple GPS observations correlation to figure out the problem of elevation accuracy.In order to achieve the purpose of safe,reliable and efficient construction of high precision installation and docking of underwater equipment.

Extraction of Desertification Land Information in the Northwest Area of Liaoning Province Using Modified Vegetation Coverage Inversion Model

ZHANG Yanan, WANG Xu, ZHEN Ying

2018, 0(5):  93-96.  doi:10.13474/j.cnki.11-2246.2018.0151

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Taking the northwest of Liaoning Province as the study area,from June of 2017 Landsat-8 OLI images as the basic data source, we introduce the object oriented multi-scale segmentation technique,combined with the use of the water index,residential index,vegetation index,shape index of two value logic method to extract information of land desertification.Based on the combination of two order sampling and remote sensing image structure,a modified vegetation coverage inversion model is constructed to realize the classification and extraction of desertification land information.The results show that this method can eliminate the disturbance information and realize the automatic and accurate extraction of the information of the desertification land.

Research on Key Remote Sensing Information Extraction Technology of Land Use

ZHANG Zhengming, ZHANG Zhixun, CHANG Yongqing, WANG Chun

2018, 0(5):  97-101,156.  doi:10.13474/j.cnki.11-2246.2018.0152

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

To the limitations of traditional land use interpretation technologies,the spectral features of ground object were analyzed deeply.And a classification method using spectral angle classification technique to classify the first-level land types and according the spectral angle image and second-class spectral characteristics to build classification rules and classify the second-class spectral characteristics was proposed.This method was used to interpret remote sensing image,and the classification accuracy of this method's classification results were compared with the maximum likelihood classification in the supervised classification.The results show that the method's classification results had better classification accuracy than the maximum likelihood classification.Its area precision and spatial accuracy was improved obviously.And this method can be used as the classification method of complex ground object.

Estimating the Desertification Boundary Using Vegetation Abundance Derived from MODIS Data: A Case Study of Shanxi-Gansu-Ningxia Region, China

MA Jingyu, QIN Yi, REN Yupeng, WANG Xin, GU Juan, GUO Zhonghao, ZOU Lejun, SHEN Xiaohua

2018, 0(5):  102-107.  doi:10.13474/j.cnki.11-2246.2018.0153

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In this study,the Shanxi-Gansu-Ningxia region is selected as the study area,and MODIS data from 2001 to 2015 is chosen as data source.The objective of this study is to explore the possibility of using vegetation abundance derived from MODIS data to estimate the desertification boundary at a large regional scale.Its significance in application is that it can quickly monitor the process of desertification by the movement of the boundary and improve accuracy of desertification assessment.The results show that:①The method developed in this paper allowed the easy and scientific determination of the desertification boundary.②When using the estimated 15% vegetation abundance isoline as the desertification boundary,we find that the desertification area shows a general trend of constant improvement with some volatility during the period from 2001 to 2015.

Characteristics and Application Guideline of Light-weight LiDAR System for Transmission Line Inspection

LI Tingjian, ZHANG Jiangang, ZHANG Zhao

2018, 0(5):  108-111.  doi:10.13474/j.cnki.11-2246.2018.0154

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

A light-weight LiDAR system specific for transmission line mapping was designed to inspect power lines located in remote area,including those of complext terrain.According to the application requirements of power line mapping,features including high precision,large field of view,highly integration,light weight and automatic navigation were described.System integration and application guideline were also demonstrated.Advantages and propects of LiDAR applications in transmission line inspection were anlysized.

Surface Subsidence Monitoring and Prediction Model by Salt Cavern Shrinkage

JIANG Yue, YANG Lun, MA Zhenhe

2018, 0(5):  112-115,125.  doi:10.13474/j.cnki.11-2246.2018.0155

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

When the halite is mined by water soluble,an enormous salt cavern is formed.It can be used to store petroleum and natural gas.The shrink of salt cavern causes volume reducing,storage space decreasing and surface subsidence.The monitoring of surface movement and deformation is an significant way to find out the shrinkage change of salt cavern.There is not special monitoring standard in China,national standard GB 50026-2007 should be adopted.Surface movement law of halite water soluble mining is mostly similar to underground coal mining,the salt cavern shrinkage is as a random process,volume shrinkage as equivalent mining thickness,cylinder salt cavern as equivalent cube.Based on Knothe influence function,the prediction model is established by cylinder salt cavern shrinkage.

Scheme Design of GNSS+GIS Remote Landslide Real-time Monitoring System

XIAO Haiping, CHEN Lanlan, GUO Guangli, LIU Xiaosheng, HE Qimin

2018, 0(5):  116-119.  doi:10.13474/j.cnki.11-2246.2018.0156

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

With the continuous mining of mining enterprises,a large number of high and steep open-pit slopes appear in China,which are affected by many factors,and bring huge hidden dangers of life and property to the people.According to the forecast model and software reliability of the existing slope response problem,according to the GNSS/GIS characteristics of integration,combined with the existing Internet communications,such as spatial information technology,put forward the overall architecture of remote system of landslide disaster early warning model,design key combination model algorithm,function requirement analysis software and main content,finally analysis and 3D display the spatial information in the GIS system,the realization of GNSS and integration based on GIS technology.The design and development of the system can provide technical support for the real-time monitoring of slope.It has certain theoretical and practical value,and provides reference for relevant research.

Analysis and Design of Real Estate Remote-backup System Based on the internet of Things: A Case Study in Guangzhou

CHEN Liyan, LIN Hong, ZHANG Jinquan, LIU Nianqiang

2018, 0(5):  120-125.  doi:10.13474/j.cnki.11-2246.2018.0157

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

The result data of real estate registration is an important basic material which clarifies ownership and content of real estate rights,thus it should be backed up regularly,and meanwhile the corresponding security responsibility system should also be established and perfected.In order to effectively solve the storage security problem of real estate registration data in Guangzhou city,in this paper,a safety-guaranteed system using to remote-backup of real estate registration results is developed based on the structure of the internet of things and some special equipment,such as the intelligent storage cabinets,the intelligent logistics boxes and the hand-held RFID readers,are designed,and the whole process of monitoring and management the real estate registration results is realized including data backup,storage,transportation and remote-backup.This paper builds a set of remote-backup system of real estate registration results in Guangzhou city,and ensures the data security and the continuous operation of registration work.This research has an important practical significance,and as can provide a great reference meaning for other cities.

3D Modeling and Design of Underground Pipe Network Based on SketchUp Software

YANG Chunyu, JI Yinxiao, HU Qiya, ZHANG Fanyuyang

2018, 0(5):  126-130.  doi:10.13474/j.cnki.11-2246.2018.0158

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In this paper, we scientifically managed, inquired and analyzed the attribute information and spatial information of underground pipeline using the database, and provided help for the design and construction of the pipeline. At the same time, combined with the heating project of Xuxinzhuang nursing home, using SketchUp software, we carried out 3D modeling of the underground pipe network, achieved 3D navigation, inquiry and analysis of the underground pipe network, provided a reference for designing a reasonable heating solution. Finally, according to the pipeline design specifications, combined with the actual situation of nursing homes, we designed a scientific and reasonable heating pipe plan.

Design and Implementation of Spatial Data Matching System of Urban Underground Pipeline

DENG Xiaohong, FENG Jianqiao, ZHOU Jing, ZHU Xuehong, ZHANG Shuliang

2018, 0(5):  131-135.  doi:10.13474/j.cnki.11-2246.2018.0159

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Based on different application purposes,there are some differences in data model,location accuracy and attribute information between the integrated underground pipeline data and professional underground pipeline data which are collected by different departments.As a result,there are two sets of data and two systems.This management model has seriously affected the integration and sharing of pipeline data between different departments.In the light of the characteristics of the two types of pipeline data,this paper constructed the pipeline hierarchical matching model,and developed the urban underground pipeline spatial data matching system,which provides software support for the integration of urban underground pipeline data,and promotes the sharing and deep application of it.

The Construction of Online 3D Service System for Digital Elevation Datum of Zhuhai

GAO Chunhui

2018, 0(5):  136-140.  doi:10.13474/j.cnki.11-2246.2018.0160

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

This paper proposed an approach to establish online 3D service system for digital elevation datum.Combined with the geo-spatial framework——"Digital Zhuhai"(ZHBDCORS),the online 3D service system for digital elevation datum has been developed.The system is rooted in the basic service data of the existing ZHBDCORS reference station network data processing software and the latest achievements of Zhuhai modern surveying and mapping datum,with the data encryption and ASP.NET technology,built a online 3D service system for digital elevation datum which is integration of data services,user management,system management,and configuration management.It has realized the high precision online geospatial infrastructure service and efficient operation and maintenance management,which has improved the quality and application level of local surveying and mapping datum service.

The Construction of Integrated Geographic Information Support Cloud Service System Based on SuperMap

GU Huaqi, MEI Chenghua, LIAO Mingwei

2018, 0(5):  141-146.  doi:10.13474/j.cnki.11-2246.2018.0161

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

The system in Jiangxi Province based on geographic information public service platform,was developed by using SuperMap GIS 8C geographic information platform for cross platform cloud architecture,two or three dimensional integration,cloud integration three based on technology system,using three-dimensional simulation technology and multimedia technology and other high-tech means,comprehensive geographic information service system construction PC terminal and the Web terminal integration,implementation of administrative law enforcement work in information technology,for emergencies and natural disasters in Jiangxi province intelligent early warning,quickly respond to emergencies to provide security services.The system is to promote the scientific development of social management in Jiangxi,and to provide services for real-time forecasting of accidents,eliminating hidden dangers,analyzing the situation and making timely decisions.The system has broad prospects for enhancing the comprehensive defense capability of natural disasters and the rapid processing capacity of all kinds of unexpected public events.

Design and Realization of Municipal County Integrated Public Service Cloud Platform for Digital City Geospatial Framework

YANG Lijuan

2018, 0(5):  147-151.  doi:10.13474/j.cnki.11-2246.2018.0162

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In view of the existing problems in the construction of digital city geospatial framework that county construction is slow,the application level is not high,operation maintenance difficulties and other issues,the paper puts forward the urban county integrated construction mode,based on the cloud environment building technology and high performance geo computing technology,research and design the integrated cloud platform of municipal county.Using HIGIS parallelization and extensibility technology to realize the core functions of GIS,such as large-scale spatial data organization and management,large-scale spatial analysis and processing,parallel visualization and mapping of large-scale spatial data.To construct the integrated public service cloud platform of digital city geospatial framework based on high performance geographic computing.Building a cloud based digital urban spatial framework for the integrated public service platform.Providing the public,government and enterprises with efficient,real-time and dynamic geographic information sharing exchange and application services.It provides a feasible and efficient solution for the construction of municipal and county integration of digital city geospatial framework.

Underground Pipeline Information Management Exploration and Practice: A Case Study in Pudong New Area

YAN Jun

2018, 0(5):  152-156.  doi:10.13474/j.cnki.11-2246.2018.0163

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

In order to solve the common problems of low accuracy,delayed update and low-level shared application of underground pipeline information,this paper puts forward a clear underground pipeline information comprehensive management institution,innovates the comprehensive management mechanism of leadership management decision-making,execution coordination network and multi-level communication channel,and constructs a centralized management mode.This paper summarizes the underground pipeline information management experience in Pudong new area,puts forward the life-cycle information communication and collection mechanism,improves the pipeline measurement and exchange system,establishes the information management platform and the normal safeguard measures.

Application of Leica in Real Estate Measurement

ZHANG Xibo, WANG Fei, ZHOU Huantong

2018, 0(5):  157-158,162.  doi:10.13474/j.cnki.11-2246.2018.0164

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

Real estate measurement is mainly to measure and investigate housing and its land use status, and provide data and data for property rights, housing management, real estate development and utilization, tax collection, and urban planning and construction. The measurement of real estate is the measurement of the combination of the conventional surveying and mapping technology and the real estate management business. Real estate measurement is the same as urban topographic survey and cadastral survey, but the contents and requirements are different because of the different service objects.

Application of 3D Laser Scanning Technology in Urban Underground Space Measurement

CHU Lixin, TAO Jun

2018, 0(5):  159-162.  doi:10.13474/j.cnki.11-2246.2018.0165

Asbtract ( )   HTML   PDF  

References | Related Articles | Metrics

This paper compares traditional measurement methods with 3D laser scanning technology. It is concluded that the 3D laser scanning technology has the characteristics of fast speed, comprehensive data and reliable precision in the field of urban underground space measurement. Also this paper introduces the process of data collection, processing, information extraction and so on.