Table of Content

25 June 2017, Volume 0 Issue 6

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Sea Level Variability over the Vietnam Seas Derived from Satellite Altimetry and Tide Gauge Data

LI Dawei, LI Jiancheng, TUAN Wenzheng

2017, 0(6):  1-4.  doi:10.13474/j.cnki.11-2246.2017.0177

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Sea level changes along the coast of Vietnam were calculated and analyzed by using satellite altimetry and tide gauge data. The results showed that there is a strong correlation between sea level changes obtained from the both data. The rate of rising sea level in Vietnam calculated by the altimeter data from 1993 to 2015 was 3.18 mm/a, and the rate by tide gauge data was 4.1 mm/a. During the whole time span of tide gauge observation, the coastal sea level of Vietnam was on the rise, at a mean rate of about 3.02 mm/a. The coastal sea level of Vietnam was characterized by strong seasonal characteristics. In the coastal areas of the Red River and the Mekong Delta, it was highly susceptible to the seasonal storms and floods.

Point Monitoring Analysis of Super High Rise Building Based on BDS+GPS Technology

WANG Yong, LIN Cairong, GUO Jiming, YIN Chaofan, ZHANG Di

2017, 0(6):  5-8.  doi:10.13474/j.cnki.11-2246.2017.0178

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In the monitoring of super high-rise buildings, the ground control points are used to upward transfer as the measuring datum by laser shots. In order to avoid the excessive errors of the casting points, the BDS+GPS technology is adopted to monitor the points' accuracy. This paper gives the corresponding strategies of data processing in high-rise building monitoring using BDS+GPS technology, with the comparative analysis of the difference among the BDS, GPS, combined BDS+GPS system and the ground point coordinates, which indicate that GPS and combined BDS+GPS have approximate accuracy, and BDS positioning performance is slightly worse. The BDS technology can meet the super high monitoring accuracy requirements, and super high-rise building datum transfer work has a certain feasibility of using BDS technology.

The Method of Enhanced Gaussian Function Weighted KNN Indoor Positioning

BI Jingxue, ZHEN Jie, WANG Yunjia, LIU Xiaoxiao

2017, 0(6):  9-12,35.  doi:10.13474/j.cnki.11-2246.2017.0179

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Because of less deployed APs in some indoor areas and signal fingerprint time-varying characteristics, it is possible for the currently scanning RSSI vector to be similar to corresponding RSSI sequence which is stored with location in radio map. In these cases, the calculated Euclidean distance is usually 0 or very small. Error will occur when the Euclidean distance is used for weight value in weighted centroid algorithm, and no result will be obtained. And KNN algorithm, which supposes the value 1/K as weight, will get the average of coordinates of K reference points along with relative low positioning accuracy. Therefore, Gaussian weighted KNN (GWKNN) localization algorithm is proposed:standardization processes for K nearest Euclidean distances were made, then corresponding weights were distributed by Gaussian function, at last, the weighted positioning result is obtained. Compared with the positioning results of KNN and WKNN algorithm, this positioning method can get higher robustness and positioning accuracy.

Checking Image-linetime Relationship for TH-01 Satellite

CHENG Jiasheng, MU Chundi, WANG Min, LIU Baocheng

2017, 0(6):  13-16.  doi:10.13474/j.cnki.11-2246.2017.0180

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The TH-01 satellite is a transmission type mapping satellite,it's able to realize global precise positioning without ground control point.However, precise satellite attitude and orbit parameters of every photographing time line are required in post process. Linetime data in archived satellite product actually serve as a bridge between image data and attitude and orbit data. We analyze the intrinsic relationship of image data,linetime data and auxiliary data, and the experiments demonstrate the influences of mismatch of 1A image and timeline data on positioning precision. Then, we propose an approach to checking the matching attribute of 1A image and timeline data. Processing results validate the availability of the proposed method.

A Novel Direct Estimation Method for Image Pose

LI Yanhuan, XU Zhenliang, SHAO Liangshan

2017, 0(6):  17-20.  doi:10.13474/j.cnki.11-2246.2017.0181

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In order to solve the problem of image pose coupling calculating, this paper has established a high-precision hierarchical estimated pose parameters of image. Firstly, we select corresponding three image points of 3D points which constitute the largest area in image as a base to estimate the depth and translate information. Then based on the above method, we obtain the scale parameter of camera exterior information. Finally, the topic is transformed to a problem of estimating rotation relationship by vector, using Procrustes theory to obtain the best estimation of the angle elements of external parameters. The method can effectively solve problems which depth and coupling pose parameters can not deal with. Experimental results show that this method of determining position and orientation parameter estimation model is of briefness, easy convergence and it can also achieve higher parameter estimation accuracy than the direct projection matrix factorization.

Super-resolution Methods Based on Dictionary Learning for Remote Sensing Images

YANG Zhenyin, SUI Lichun, LI Li, KANG Junmei, DING Mingtao

2017, 0(6):  21-25.  doi:10.13474/j.cnki.11-2246.2017.0182

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In recent years, super-resolution reconstruction technology based on dictionary learning has obtained much attention and has been intensively studied. Compared with the super-resolution method based on reconstruction, the learning-based method makes full use of prior knowledge. This learning-based method can get better results when magnification is high, which has been recognized as an extremely promising method. The properties of the existed learning-based super-resolution reconstruction algorithms are firstly analyzed systematically. Then this paper reviews the theory of three learning-based algorithms and combs their advantages and disadvantages. Finally, according to characteristics of remote sensing image, the same data sources are used for dictionary learning. We select these three algorithms mentioned to generate high and low resolution joint dictionary and adopt test images of different sizes and zoom and complete reconstruction. The reconstruction performance, robustness and complexity of various algorithms are analyzed comprehensively by experimental results. What's more, aiming at different application requirements of remote sensing image, the applicability of different algorithms is further studied.

UAV Aerial Triangulation for Low-attitude Photogrammetry Assisted by Multi-view Geometry Theory

CHEN Deng, LIN Hui, SU Tianlu, PENG Guanhui, YANG Huachao

2017, 0(6):  26-30.  doi:10.13474/j.cnki.11-2246.2017.0183

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In order to reduce the influence of poor UAV flight attitude on subsequent aerial triangulation data processing, computer vision multi-view geometry theory is introduced into traditional photogrammetry, and its 3D data processing result is taken as initial data for aerial triangulation encryption in photogrammetry to improve the accuracy and reliability of aerial triangulation encryption. The accuracy of the proposed method is proved by the multi-zone test with different ground resolutions and different topographic features, which provides theoretical and practical reference for practical application.

Automatic Discrimination of Cloud and Cloud-like Target in High Resolution Satellite Imagery

LI Aiqin, WANG Huandong, WANG Jingyi, HU Xiangyun

2017, 0(6):  31-35.  doi:10.13474/j.cnki.11-2246.2017.0184

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Clouds in remote sensing imagery have an impact on its process and subsequent target recognition. Thus, automatic cloud extraction is essential to the application of high-resolution imagery. The complex shapes of the clouds in high-resolution imagery and the interference of cloud-like targets make it difficult to achieve a practical automatic cloud extraction. In this paper, we choose snow as the example of cloud-like target, and develop an algorithm which chooses shape, texture and edge as the key features to discriminate cloud from cloud-like targets. Firstly, the input image is preprocessed with Wallis filtering to enhance texture patterns at different scales. Then the input is segmented by a fast stable mean-shift segmentation. The first support vector machine classifier is built with gray and texture features, which divides all segmented parts into "cloud" and common ground targets. A second classifier is built with edge, shape and texture features to divide "cloud" areas into clouds and cloud-like targets. Finally, Grab-cut is applied to refine edges of cloud extraction results iteratively. Experiments achieve good results and demonstrate the algorithm's capability to extract clouds in high-resolution imagery precisely with the interference of cloud-like targets.

A Linear Feature Extraction Algorithm for Buildings in Remote Sensing Images

ZHU Tianyi, FAN Qiang, DU Manfei

2017, 0(6):  36-39.  doi:10.13474/j.cnki.11-2246.2017.0185

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With the continuous development of remote sensing technology, efficient and fast remote sensing image processing has become a hot research topic. As the basis of internal processing, people pay more and more attention to the feature extraction. Using the 1:2000 orthophoto map of the university of science and technology of Liaoning according to the teaching area, building area and road greening characteristics mixed, this experiment puts forward a kind of automatic recognition and extraction of building linear feature algorithm. The algorithm combines straight line fitting and Hough transform, and adds a priori method. The experimental results show that the algorithm is superior to the traditional Hough transform in line extraction, and it can well adapt to the teaching area, and has a great improvement in the recognition ability and the linear extraction efficiency of the building.

Study on the Equity of GIS-based Urban Green Space in Shahekou District of Dalian——From the Perspective of Sustainable Human Living Environment

GAO Jiaji, LI Xueming, CHEN Dachuan, ZHANG Yingjia

2017, 0(6):  40-44,52.  doi:10.13474/j.cnki.11-2246.2017.0186

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The rapid process of urbanization in China is suffering from environmental pollution, traffic congestion, housing shortage and a series of urban problems. Urban ecological environmental quality continue to decline. The urban green landscape plays an important role in the balance of carbon and oxygen. Developing the urban greening vigorously will help to improve the urban environment. But at present, in our country, there is a lack of specific spatial distribution planning in city green space construction. Cities focuse only on the green coverage rate and green space of human settlements but pay less attention in the fairness of green space service function. This paper researches on the green space accessibility of Shahekou District in Dalian City by ArcGIS. By comparing the green space accessibility and the type of human settlement environment in Shahekou District, we found that high-income social groups have a higher green space accessibility than the low-income social groups. City planners should be aware of these issues and concern all sectors' need of green space in the future construction, so that urban residents can enjoy a more equitable public service resources.

Objects Reconstruction Oriented to Indoor Scene Point Cloud

YANG Zexin, CHENG Xiaojun, DING Qiong, CHENG Xiaolong

2017, 0(6):  45-48,93.  doi:10.13474/j.cnki.11-2246.2017.0187

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This paper presents an algorithm of reconstructing objects from indoor scene point cloud for solving the low efficiency problem of object extraction and reconstruction in reverse engineering. The steps of this approach are as follows:firstly, the non-object clouds are removed by using pass-through filter and the improved RANSAC algorithm; then the object clouds are segmented according to Euclidean Cluster Extraction algorithm; finally, the object models are reconstructed based on the α-shape theory. The experimental result shows that the proposed method, which is of high practical value, can quickly and automatically reconstruct the 3D models representing real objects from unorganized indoor scene point clouds.

A Method of Line Simplification Considering Patches Outline Considering Topological Relations

HU Fengmin, LU Xiaoping, LI Chengming, DENG Anjian

2017, 0(6):  49-52.  doi:10.13474/j.cnki.11-2246.2017.0188

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According to the actual demand for the mapping of geographical conditions census, this paper proposes a simplified method considering the original topological relations of the patches. By constructing the topography of the patches, the simplification of the patches is transformed into the simplification of the shared arc which is classified. The corresponding simplified methods are used for different types of arcs. The results show that the method can maintain the structure of the patches and keep the map clean and tidy. The method conforms to the requirements of map mapping, which obtains the good application effect.

The Extraction of Wetland Information Based on National Geographic Condition Census Results

SONG Bibo, LU Xiaoping, LIU Min, XIE Mengli, SHI Jing

2017, 0(6):  53-56,141.  doi:10.13474/j.cnki.11-2246.2017.0189

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A set of technical process to extract wetland information from the first national geographical conditions census result is studied and formulated, including data integration, information extraction, thematic map making, etc., which uses the multi-attribute index analysis method. Experiment results show that the method is better than the forestry department. It is more accurate and detailed, and the classification accuracy is more than 93%. This research promotes the transformation of geographical conditions census result and the integration with forestry business data, and also provides a new method and reference for wetland resources investigation.

Automatic Correction Algorithm of Water Element Attribute Oriented to National Geographic Census

GUO Peipei, LI Chengming, YIN Yong, WU Pengda

2017, 0(6):  57-60,76.  doi:10.13474/j.cnki.11-2246.2017.0190

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A subset of the attributes of water element data in national geographic census are not clear, the current solution to this problem is manual filling which is inefficient and liable to make mistakes. So this paper proposes an automatic correction algorithm of water element attribute. Based on the analysis of the structure characteristics and topological relation, we put forward three basic principles of correction which include network proximity, structure robustness and topology ductility. Based on the WJ-Ⅲ map workstation which is developed by Chinese Academy of Surveying and Mapping, we realize the automatic correction of water elements. Finally, practical data are used to validate the method. The results show that our method is highly reasonable and efficient.

Establishment of Fundamental Geographic Framework of National Economic Atlas

SONG Ying, LIU Zixi, CHENG Xiong

2017, 0(6):  61-67.  doi:10.13474/j.cnki.11-2246.2017.0191

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In the background of the compilation and research on the National Economic Atlas of People's Republic of China (New Century Edition), this paper delved into several problems in establishing the fundamental geographic framework of the economic atlas under the technological condition of surveying and mapping, and geo-information research of the new era. Focusing on the characteristics of multi-scale, multi-resolution, multi-temporal and diversity of the atlas,the paper discussed the map projection, map scale and subdivision, map orientation, and the design of geographical base maps through comparison and demand analysis, with which the fundamental geographic framework of the atlas was determined.

Improvement of Tidal Level Numerical Simulation Based on Water Level Correction Model

GUAN Minglei, HUANG Chenhu, LI Qingquan, WANG Chisheng, DING Kai

2017, 0(6):  68-71.  doi:10.13474/j.cnki.11-2246.2017.0192

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The finite volume coastal ocean model (FVCOM) has been applied to establish a high-resolution numerical model of tide in Haizhou Bay. The time series of astronomical tidal values at each grid point are extracted. The water level correction model is used to extract the water level correction data from the five tide station data in this area, and the water level of the grid site is corrected. The water level time series of the grid is obtained with high precision, then the modified water level value is interpolated. The instantaneous sea surface height is obtained at a certain time. The results show that the water level accuracy is improved by about 10 cm based on the numerical simulation of water level correction and the sea surface height model has been improved obviously.

The Extraction Method of Silt Boundary Layer in Sub-bottom Profiler Data Interpretation

HU Mengtao, JIANG Tingchen, LI Jiaqi, LIU Zhiqiang, DONG Chunlai

2017, 0(6):  72-76.  doi:10.13474/j.cnki.11-2246.2017.0193

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Port and waterway silt layers determination is of great significance for the development and implementation of the harbor construction project. Based on the fuzzy problem of the original data collection of sub-bottom profiler, analyze the main reasons affecting the authenticity of the original data, process the median filter multiple attenuation and de-noising, clear and reliable real data image files have been obtained. According to the reflection characteristics of different layer boundaries of submarine acoustic wave, comparatively analyze the change of the sound intensity image of pulse signal, discuss the shallow profile data extraction method of sound intensity image based on silt layer. Experiments show that the boundary layer division method can achieve the current range of precision drilling data.

Research and Application of Real-time High-precision Positioning System for High-speed EMU Based on BeiDou

ZHANG Xiaojun, CUI Hongzhou, YUAN Shengyong

2017, 0(6):  77-81.  doi:10.13474/j.cnki.11-2246.2017.0194

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BeiDou navigation satellite system has possessed formal services for the Asia-Pacific region and begun the construction of BeiDou's global satellite navigation system. For evaluating the real-time differential positioning accuracy of BDS under the high-speed moving conditions, a real-time high-precision positioning system is designed for EMU trains and a high-speed railway test section is constructed. The field testing results show that the real-time positioning accuracy in vertical track direction on level can be better than 1 m under the condition of EMU train high speed moving which indicates that the system has the ability to clearly distinguish the track of the EMU train. To a certain extent, the system can meet some urgent needs of the positioning applications in railway industry.

A Method for Rapid Estimation of Runoff Coefficient Based on Spectral Features of High Resolution Image——A Case Study in Sponge City Demonstration Area, JiaXing

ZHANG Jianying, FU Shuai, AI Bo

2017, 0(6):  82-86.  doi:10.13474/j.cnki.11-2246.2017.0195

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According to the formula of runoff coefficient of integrated rainfall,a rapid estimation method of runoff coefficient of integrated rainfall is proposed based on spectral features of high resolution image. With object oriented segmentation and classification technology and shadow classification method, classification information of demonstration area is obtained, so as to achieve the purpose of estimating the ratio.Taking Jiaxing sponge city demonstration area as an example, this paper compares the results of the national geographical census in Jiaxing to verify the feasibility of the method.

The Assembling of Camera System and GPS Carried on UAV for Large Scale Topographical Mapping

DENG Xuefeng, HE Yahui, GAO Yu

2017, 0(6):  87-89,141.  doi:10.13474/j.cnki.11-2246.2017.0196

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In this paper, unmanned aerial vehicle (UAV) is used as a low altitude remote sensing platform. On the basis of integration of small light measurement camera with dual frequency high dynamic GPS, a three axis stabilized platform device can stably keep the camera attitude angle of UAV, make digital image shooting can meet the requirements of large scale mapping. The system is successfully applied in the 1:500 large-scale topographic mapping project. The experimental results show that the accuracy of the system can be well suited to the requirements of the national photogrammetric mapping standards and the urban surveying standards.

Key Technologies Analysis of DEM Production Based on LiDAR Data

JIANG Guimei, NIE Qian, CHEN Xiaosong

2017, 0(6):  90-93.  doi:10.13474/j.cnki.11-2246.2017.0197

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The paper focuses on the analysis of the key steps of extracting DEM from airborne-LiDAR data, including point cloud data preprocessing, the data filtering and classification, high precision DEM manufacturing and quality evaluation. In this paper, the DEM production technology process based on airborne-LiDAR data is established, and will be used on a city situation special survey of geographical conditions:high precision surface modeling project in Ningbo. A high precision DEM model of 1:2000 scale rule grid of Ningbo built-up area is constructed which provides a data base for the survey of geographical conditions in Ningbo.

A Novel FMCW GB-SAR Based Bridge Deformation Measurement Campaign

GUO Peng, ZHANG Haoyu, CHEN Li, ZHOU Keqin, WANG Chunlai

2017, 0(6):  94-97.  doi:10.13474/j.cnki.11-2246.2017.0198

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Ground-based synthetic aperture radar (GB-SAR) is a new type of building deformation monitoring technologies. Compared with the traditional monitoring methods, this method features high precision and large area. Fast-GBSAR is designed based on the frequency modulated continuous wave (FMCW) technology. Compared with the similar system based on the stepping continuous wave technology in China, the processing speed of the system is increased by 30 times and the reliability is higher. Fast-GBSAR has carried on the public test to many bridges in the country, the monitoring result indicated that Fast-GBSAR measurement precision can achieve 0.01 mm. Fast-GBSAR has the great potential in the deformation monitoring domain.

Software Design of Real Time Subway Deformation Monitoring System Based on Android Smart Terminal

YU Teng, HU Wusheng, JIAO Minglian, SUN Xiaorong

2017, 0(6):  98-104,121.  doi:10.13474/j.cnki.11-2246.2017.0199

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Taking a section of operation in Nanjing No.2 subway line continuous monitoring data as an example, based on the hardware of the automatic monitoring system which is based on the TM30 measuring robot and the RTU data transmission as the main body, this paper mainly discusses the requirement analysis,architecture design and function module partition of subway deformation monitoring system based on Android smart terminal,analyzes the key technologies used in the realization of the BLE application and the main methods to solve the key and difficult problems. It develops a convenient and practical application of Android,making Android intelligent terminal and automatic monitoring system can work together. Practice has proved that the timeliness of deformation information transmission is greatly enhanced, and has been expected to be applied in similar projects.

Construction and Thinking on Platform of Public Welfare Standard Map Service

ZHOU Xinwei, ZHANG Wenhui, DI Lin, SHI Lei, DU Xiurong, YAN Yongwei

2017, 0(6):  105-107,113.  doi:10.13474/j.cnki.11-2246.2017.0200

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In order to meet requirements of Regulations of the People's Republic of China on the Administration of maps, serve public and develop map market, innovate map services and mechanisms. A platform of public welfare standard map service has been designed and constructed in this paper. The first batch of public welfare standard maps has been published. The aim of the platform is to provide the correct map data and practical map services. On the one hand, the platform provides standard map data download server of China map, world map and thematic map. On the other hand, the platform realizes self-mapping service on line. In order to build the national public welfare standard map service platform, a deep reflection on how to provide better public welfare map service for the public has been given at the end in this paper.

Design and Realization of Surveying Markers Dynamic Management Information System

HE Zongyou, ZHU Ziyang, GONG Gensheng, YUAN Xihao

2017, 0(6):  108-113.  doi:10.13474/j.cnki.11-2246.2017.0201

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The survey markers management is a systematic and continuous work. The current management system lacks tracking feedback on the whole life cycle of the measurement marks. It is difficult to form an effective supervision. It is urgently needed to improve and enhance the technical means. In this paper, dynamic management of demand survey marks were comprehensively analyzed based on the current situation of the development of surveying and mapping information. The design and implementation of a dynamic management information system of the survey marks is described from the logic of the system architecture, network architecture, data organization, platform structure and security control. Combining with the digital city, Map World Guangdong, Guangdong provincial online inspection system, and the actual business needs, a reasonable load, maintenance of Guangdong Province survey mark management information system convenient is developed. The results show that the system has changed the traditional management mode of measuring marks. It meets the requirements of inspection, updating and dynamic management of the markers,and improves the monitoring level of measurement marks, and has a realistic and scientific significance to maintain the life cycle of the measurement of each link.

Research and Application Advantages of Continuous Compaction Control System

LIN Guoli, LU Yongming, CHENG Jingwei

2017, 0(6):  114-117,121.  doi:10.13474/j.cnki.11-2246.2017.0202

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In order to meet the requirements of compactness in the earthwork reclamation construction, high precision positioning technology based on Global Navigation Satellite System(GNSS) and continuous compaction control(CCC) technology are both used to develop a compaction management system that can monitor the whole process. The composition of the compaction management system and functions of each subsystem are also introduced, and the integrity of the management system is embodied in the cooperative workflows of all subsystems. In the rolling subsystem which is the core of the system, the construction quality can be effectively controlled by compaction process index and compaction quality index. Continuous compaction management system can monitor and manage the whole process of earthwork. It is an important attempt of building information modeling(BIM) in the earthwork compaction project, which has great application prospects and advantages.

Research on Virtual Campus Environment Based 3D GIS

ZHANG Huixia, MA Shenbing, ZHANG Yichi

2017, 0(6):  118-121.  doi:10.13474/j.cnki.11-2246.2017.0203

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With the development of virtual reality technology, 3D modeling and visualization technology has been used in the smart city. In this paper, 3ds Max software is used to build modeling of campus buildings, roads, trees and other features, and visualization in the SuperMap software. Taiyuan Normal University is as an example, this paper researches the key techniques of data acquisition, data processing, 3D modeling and visualization, especially focuses on particle effects and its application in the rain, snow, fireworks effects, which really reproduce the three-dimensional environment of the campus.

Rapid Earthwork Calculation Method Supported by UAV-DEM

ZHU Lianhui, TIAN Yi, WANG Wei, MAO Cuilei

2017, 0(6):  122-124,145.  doi:10.13474/j.cnki.11-2246.2017.0204

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Land leveling project is one of the most important parts of the land remediation project, and the rapid and accurate calculation of the earthwork of the project is related to the success of the planning of the land remediation and whether the project funds are reasonable. This paper takes Zezhou county river basin in Jincheng city of Shanxi Province as an example, and introduces the UAV technology to collect the land leveling engineering foundation data to generate DEM data for land leveling. Then, with the help of the elevation statistical function of ArcGIS 10.1 software, the ideal study area for design elevation statistics to be obtained, based on all above, the amount of soil about the plots to dig and fill finally obtained. The results show that the method can greatly reduce the duplication of earthwork calculation and that the calculation results are accurate.

Judgement and Solutions of Classified Pictures in Domestic Real-scene-view Internet Maps

ZUO Dong, ZHANG Yuxin

2017, 0(6):  125-128.  doi:10.13474/j.cnki.11-2246.2017.0205

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Recent years, the real-scene-view maps have fully developed. They have obvious advantages of providing advanced LBS in Internet maps for everyone. As its real-scene-view feature, the national classified information may be revealed if staffs can't manage the relative things well. So, it is very important for having a clear mind of preventing classified information be revealed by real-scene-view internet maps. This paper analyzed the judgement and solutions of classified pictures in domestic real-scene-view internet maps based on relative national laws and regulations.

Production Practice and Application Thinking of Fundamental Geographic National Condition Monitoring

SUN Jing, WANG Tiejun, ZHAO Lijian

2017, 0(6):  129-132,145.  doi:10.13474/j.cnki.11-2246.2017.0206

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This paper obtains the basic national geographic monitoring data of 10 years between 2005 and 2015. Based on it, the flow direction of monitored elements, urban space expanding, changes of transportation, water area, forest and grass land, etc., are analyzed, and some meaningful conclusions are drawn. The results are verified by other materials. The application research of monitoring data results are carried out.

Research on Zhejiang Offsite Disaster Recovery System for Surveying, Mapping and Geoinformation Archives

WANG Liangqing, WANG Yuzhai, LI Aiqin

2017, 0(6):  133-136.  doi:10.13474/j.cnki.11-2246.2017.0207

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This paper examines the case for Zhejiang offsite disaster recovery center for surveying, mapping and geoinformation archives based on the status quo of its backups, requirements and the levels of disaster recovery. It also discusses the frameworks and techniques of the center and comes up with two design models for disaster recovery systems based on external and internal networks respectively. Much attention goes to how online data are replicated synchronously and asynchronously via NexentaStor, DataGuard and DFS, as well as the maintenance of offsite data remote backups. The combination of online disaster recovery and offsite data backup would provide a comprehensive plan for surveying, mapping and geoinformation professionals.

Design and Precision Calibration of Wireless Real-time Deformation Monitoring System for Form-work

ZHENG Kuo, LI Changqing, CUI Youzhen, WU Shenglin

2017, 0(6):  137-141.  doi:10.13474/j.cnki.11-2246.2017.0208

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This paper introduces the basic structure and the main working process of the wireless real-time deformation monitoring system for form-work, and proposes the use of an absolute laser taker with comprehensive instrument to mold the core components of displacement and angle sensor to monitor the accuracy of calibration, and designs wireless real-time monitoring sensors and calibration work in experimental models. Experimental analysis provides effective data support for the determination of sensor precision and the development of R & D.

Research on the Integrated Practice Instruction for Science of Surveying and GIS with the Link of Map

WANG Qingguo

2017, 0(6):  142-145.  doi:10.13474/j.cnki.11-2246.2017.0209

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Under the background of the informatization of surveying and mapping, in order to conform to the development and change of the subject and the industry of surveying and mapping, and strengthen the comprehensive ability training of surveying and mapping, and geographic information, the research on the integrated practice instruction for science of surveying and GIS with the link of map is given.

Some Thoughts on the Theoretical Teaching of the “Introduction to Earth Science” for Surveying and Mapping Majors

LIU Yang, XU Caijun, WEN Yangmao

2017, 0(6):  146-148,152.  doi:10.13474/j.cnki.11-2246.2017.0210

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In this paper, based on the curriculum role of the "Introduction to Earth Science" and the feature of the Surveying and Mapping majors, three cases are analyzed and presented, which are related to the extension of the teaching content of the "Introduction to Earth Science" due to the development of the surveying and mapping majors. Furthermore, some thoughts on the theoretical teaching of the "Introduction to Earth Science" for the surveying and mapping majors are proposed. The result can provide a reference for the related majors to carry out the teaching of this course.

Discussion on the Teaching Design of the Flipped Classroom in the Course of Landscape Architecture Engineering Surveying

CHEN Xiaogang, LIN Hui, ZHAO Haiyun, HONG Liang

2017, 0(6):  149-152.  doi:10.13474/j.cnki.11-2246.2017.0211

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The use of flipped classroom is an important reform of the traditional teaching mode of Chinese universities and colleges in the course of landscape architecture engineering surveying. The essence of the flipped classroom is the change of the role of the teacher and the student, the teacher becomes the scholar and the answer of the professional knowledge, while the student is the main body of the professional knowledge. This paper combines "engineering survey" course in landscape architecture, applies for the basic theory and the internal implementation logic of the flipped classroom, for the teaching design of the flipped classroom in the course of landscape architecture engineering surveying, constructs interactive teaching evaluation system centered on the students, and improves the students' learning initiative and creativity, so as to drive the reform of traditional teaching mode in university.