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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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Journal DOI :
Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 30, Issue 6_2 - Dec 2012
Volume 30, Issue 6_1 - Dec 2012
Volume 30, Issue 5 - Oct 2012
Volume 30, Issue 4 - Aug 2012
Volume 30, Issue 3 - Jun 2012
Volume 30, Issue 2 - Apr 2012
Volume 30, Issue 1 - Feb 2012
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Massive 3D Point Cloud Visualization by Generating Artificial Center Points from Multi-Resolution Cube Grid Structure
Yang, Seung-Chan ; Han, Soo Hee ; Heo, Joon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 335~342
DOI : 10.7848/ksgpc.2012.30.4.335
3D point cloud is widely used in Architecture, Civil Engineering, Medical, Computer Graphics, and many other fields. Due to the improvement of 3D laser scanner, a massive 3D point cloud whose gigantic file size is bigger than computer's memory requires efficient preprocessing and visualization. We suggest a data structure to solve the problem; a 3D point cloud is gradually subdivided by arbitrary-sized cube grids structure and corresponding point cloud subsets generated by the center of each grid cell are achieved while preprocessing. A massive 3D point cloud file is tested through two algorithms: QSplat and ours. Our algorithm, grid-based, showed slower speed in preprocessing but performed faster rendering speed comparing to QSplat. Also our algorithm is further designed to editing or segmentation using the original coordinates of 3D point cloud.
Precise Estimation of Vertical Position Displacement by Replacement of CORS Antennas
Jung, Kwang-Ho ; Lee, Young-Jin ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 343~352
DOI : 10.7848/ksgpc.2012.30.4.343
In order to precisely determine the vertical displacements of CORS antenna phase centers caused by their replacement, intensive research has been carried out in this paper throughout processing GPS measurements made before and after the events. After applying the estimated displacement in the data processing, results show that coordinate repeatability of the vertical component is able to be 7.9mm on average. Comparing with results (e.g., 23.5mm) without applying the displacement, it was possible to conclude that these accuracies are significantly improved, which is equivalent to those before the event of the replacement.
3D building modeling from airborne Lidar data by building model regularization
Lee, Jeong Ho ; Ga, Chill Ol ; Kim, Yong Il ; Lee, Byung Gil ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 353~362
DOI : 10.7848/ksgpc.2012.30.4.353
3D building modeling from airborne Lidar without model regularization may cause positional errors or topological inconsistency in building models. Regularization of 3D building models, on the other hand, restricts the types of models which can be reconstructed. To resolve these issues, this paper modelled 3D buildings from airborne Lidar by building model regularization which considers more various types of buildings. Building points are first segmented into roof planes by clustering in feature space and segmentation in object space. Then, 3D building models are reconstructed by consecutive adjustment of planes, lines, and points to satisfy parallelism, symmetry, and consistency between model components. The experimental results demonstrated that the method could make more various types of 3d building models with regularity. The effects of regularization on the positional accuracies of models were also analyzed quantitatively.
Performance Assessments of Three Line Simplification Algorithms with Tolerance Changes
Lee, Jae Eun ; Park, Woo Jin ; Yu, Ki Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 363~368
DOI : 10.7848/ksgpc.2012.30.4.363
The result of the line simplification algorithm varies with the choice of algorithms, the change in tolerance and the selection of target objects. Three of the algorithms used in this study are Sleeve-fitting, Visvalingam-Whyatt, and Bend-simplify. They were applied to the three kinds of objects which were buildings, rivers, and roads with the five degrees of the tolerance. Through this experiments the vector displacement, the areal displacement, and the angular displacement were measured and the qualitative analysis was performed with the trend line of the errors. The experimental results show that errors were differ from tolerance values, and characteristics of line simplification algorithms based on changes of tolerance were understood.
Utilization of Real-time Aerial Monitoring System for Effective Damage Investigation of Natural Hazard
Jung, Kap Yong ; Yun, Hee Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 369~377
DOI : 10.7848/ksgpc.2012.30.4.369
Recently, development of IT technology and enhancement of spatial information technology increases the necessity about effective technology of damage investigation in the area of disaster prevention. Quick damage investigation is necessary to deal with the natural hazard and plan the recovery. To do this, UAV is the useful mean for quick damage investigation. In this study, it was evaluated based on UAV that utilization of real-time aerial monitoring system for effective damage investigation of natural hazard. Accuracy analysis was implemented to evaluate the application of this system. And utilization of damage investigation was evaluated based on the domestic regulations that is appled the system according to the type of hazard. As a result, damage investigation was possible about house, farmland, agriculture and forestry facilities and public facilities. Henceforth, it will be effectively possible to inspect damage for natural disaster and to establish restoration plan through utilization of acceptable image data by Real-time Aerial Monitoring System in real various natural disaster.
Matching and Attribute Conflating Method for Linking the Digital Map with the Road Name Address System - Focused on the Road Centerline Layer -
Bang, Yoonsik ; Ga, Chillo ; Yu, Kiyun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 379~388
DOI : 10.7848/ksgpc.2012.30.4.379
The Road Name Address system has begun to be applied and widely used since 2011. However, the Digital Map, or the national representative basic map, has no reference to the Road Name Address system. It causes some difficulties to use the Digital Map under the Road Name Address system. In this paper, we suggest a method for generating the expanded Digital Map by adding information about Road Name Address system into the objects of the Digital Map. First, object matching pairs between the road section layer from the Road Name Address Map and the road centerline layer from the Digital Map are found. Then attributes to be copied from the Road Name Address map to the Digital Map are extracted by comparing their attribute tables. Finally the extracted attributes are copied from the Road Name Address Map to the Digital Map. The expanded road centerline layer of the Digital Map then has attributes about road name according to the Road Name Address system, so that the georeferencing of the Digital Map according to the Road Name Address system becomes possible.
Accuracy Analysis of Network-RTK(VRS) for Real Time Kinematic Positioning
No, Sun-Joon ; Han, Joong-Hee ; Kwon, Jay Hyoun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 389~396
DOI : 10.7848/ksgpc.2012.30.4.389
As the demand on the precise positioning for the moving objects has been increased in the various industry field, many studies have been conducted to analyze real time kinematic technique and its practical usage. The main purpose of this study is to analyze the possibility of Network-RTK(VRS) in real-time kinematic positioning. So, the accuracy analysis has been conducted by comparing the Network-RTK(VRS) position with respect to the RTK position. As a result, Network-RTK(VRS) based on kinematic positioning has centimeter level of RMS in the ideal environment compared to RTK positioning. However, when the integer ambiguities was lost, the accuracy of Network-RTK was meter level. At that time, the quality value has been changed dramatically and shows big correlation with accuracy. When the position and height quality values are within 0.1m, the RMS of the horizontal and vertical position appears better than 10cm and 20cm, respectively. However, if the quality value is over 0.1m, the RMS increases to larger than a meter. Therefore, it is recommended to check the quality value when conducting Network-RTK(VRS) kinematic positioning to get the centimeter level accuracy.
Analyzing the Applicability of Greenhouse Detection Using Image Classification
Sung, Jeung Su ; Lee, Sung Soon ; Baek, Seung Hee ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 397~404
DOI : 10.7848/ksgpc.2012.30.4.397
Jeju where concentrates on agriculture and tourism, conversion of outdoor culture into cultivation under structure happens actively for the purpose of increasing profit so continuous examination on house cultivation area is very important for this region. This paper is to suggest the effective image classification method using high resolution satellite image to detect the greenhouse. We carried out classification of greenhouse using the supervised classification and rule-based classification method about Formosat-2 images. Connecting result of two classification try to find accuracy improvement for greenhouse detection. Results about each classification method were calculated the accuracy by comparing with the result of visual detection. As a result, mahalanobis distance among the supervised methods was resulted in the highest detection. Also, it could be checked that detection accuracy was improved by tying with result of supervised method and result of rule-based classification. Therefore, it was expected that effective detection of greenhouse would be feasible if henceforward further study is performed in the process of connecting supervised classification and rule-based classification.
Improvement of Building Region Correspondence between SLI and Vector Map Based on Region Splitting
Lee, Jeong Ho ; Ga, Chill O ; Kim, Yong Il ; Yu, Ki Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 405~412
DOI : 10.7848/ksgpc.2012.30.4.405
After the spatial discrepancy between SLI(Street-Level Imagery) and vector map is removed by their conflation, the corresponding building regions can be found based on SLI parameters. The building region correspondence, however, is not perfect even after the conflation. This paper aims to improve the correspondence of building regions by region splitting of an SLI. Regions are initialized by the seed lines, projection of building objects onto SLI scene. First, sky images are generated by filtering, segmentation, and sky region detection. Candidates for split lines are detected by edge detector, and then images are splitted into building regions by optimal split lines based on color difference and sky existence. The experiments demonstrated that the proposed region splitting method had improved the accuracy of building region correspondence from 83.3% to 89.7%. The result can be utilized effectively for enhancement of SLI services.
Accuracy Analysis of Cadastral Control Points Surveying using VRS case by Jinju city parts
Choi, Hyun ; Kim, Kyu Cheol ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 4, 2012, Pages 413~422
DOI : 10.7848/ksgpc.2012.30.4.413
After development of GPS in the 1960's, the United States released SA(Selective Availability) in 2000 and then the GPS has become commercialized to the present. The result of repeatedly developed GPS observation, the GPS real-time observation methods is RTK which basically always needs two base stations and has a fault of the accuracy decreasing as the distance between a mobile station and a receiver is increasing. Because of these weakness, VRS method has come out. VRS(Virtual Reference Station) generates the imaginary point near mobile station from several observatory datum of GPS, sets the accurate location of mobile station, thus shows high reliability and mobility. Now, the cadastral datum point is used with azimuth, repetition, and graphical traversing method for traverse network. The result of measurement indicates many problems because of different accomplishment interval given point, restrictions on the length of the conductor, many errors on the observations. So, this study did comparative analysis of the cadastral datum points through VRS method by Continuously Operating Reference Station. Through the above comparative analysis, The comparative result between surveyed result with repetition method through total station observed Cadastral Control Points and surveyed result with VRS-RTK has shown that average error of x-axis is -0.08m, average error of y-axis, +0.07m and average distance error is +0.11m.