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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
Journal Basic Information
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
Selecting the target year
A Study on Bicycle Route Selection Using Optimal Path Search
Baik, Seung Heon ; Han, Dong Yeob ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 425~433
DOI : 10.7848/ksgpc.2012.30.5.425
Dijkstra's algorithm is one of well-known methods to find shortest paths over a network. However, more research on
algorithm is necessary to discover the shortest route to a goal point with the heuristic information rather than Dijkstra's algorithm which aims to find a path considering only the shortest distance to any point for an optimal path search. Therefore, in this paper, we compared Dijkstra's algorithm and
algorithm for bicycle route selection. For this purpose, the horizontal distance according to slope angle and average speed were calculated based on factors which influence bicycle route selection. And bicycle routes were selected considering the shortest distance or time-dependent shortest path using Dijkstra's or
algorithm. The result indicated that the
algorithm performs faster than Dijkstra's algorithm on processing time in large study areas. For the future, optimal path selection algorithm can be used for bicycle route plan or a real-time mobile services.
Automated Generation of Multi-Scale Map Database for Web Map Services
Park, Woo Jin ; Bang, Yoon Sik ; Yu, Ki Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 435~444
DOI : 10.7848/ksgpc.2012.30.5.435
Although the multi-scale map database should be constructed for the web map services and location-based services, much part of generation process is based on the manual editing. In this study, the map generalization methodology for automatic construction of multi-scale database from the primary data is proposed. Moreover, the generalization methodology is applied to the real map data and the prototype of multi-scale map dataset is generated. Among the generalization operators, selection/elimination, simplification and amalgamation/aggregation is applied in organized manner. The algorithm and parameters for generalization is determined experimentally considering T
pfer's radical law, minimum drawable object of map and visual aspect. The target scale level is five(1:1,000, 1:5,000, 1:25,000, 1:100,000, 1:500,000) and for the target data, new address data and digital topographic map is used.
Impact of Mathematical Modeling Schemes into Accuracy Representation of GPS Control Surveying
Lee, Hungkyu ; Seo, Wansoo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 445~458
DOI : 10.7848/ksgpc.2012.30.5.445
The objective of GPS control surveying is ultimately to determine coordinate sets of control points within targeted accuracy through a series of observations and network adjustments. To this end, it is of equivalent importance for the accuracy of these coordinates to be realistically represented by using an appropriate method. The accuracy representation can be quantitively made by the variance-covariance matrices of the estimates, of which features are sensitive to the mathematical models used in the adjustment. This paper deals with impact of functional and stochastic modeling techniques into the accuracy representation of the GPS control surveying with a view of gaining background for its standardization. In order to achieve this goal, mathematical theory and procedure of the single-baseline based multi-session adjustment has been rigorously reviewed together with numerical analysis through processing real world data. Based on this study, it was possible to draw a conclusion that weighted-constrained adjustment with the empirical stochastic model was among the best scheme to more realistically describe both of the absolute and relative accuracies of the GPS surveying results.
Assessment of Positioning Accuracy based on Medium- and Long-range GPS L1 Relative Positioning using Regional Ionospheric Grid Model
Son, Eun-Seong ; Won, Jihye ; Park, Kwan-Dong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 459~466
DOI : 10.7848/ksgpc.2012.30.5.459
The ionospheric delay is the largest error source in GPS positioning after the SA effect has been turned off. The ionospheric error can be easily removed by using ionospheric-free combinations but it is only restricted for dual-frequency receivers. Therefore, in this study, the regional ionospheric grid model was developed for single-frequency receivers. The developed model was compared with GIM to validate its accuracy. As a result, it yielded RMSE of 3.8 TECU for 10 days. And L1 medium- and long-range relative positioning was performed to evaluate positioning accuracy improvements. The positioning accuracy was improved by 46.7% compared with that without any correction of ionosphere and troposphere and was improved by 14.5% compared with that only tropospheric correction.
Analysis of the Effect on the Location Evaluation of Golf Course according to the Unit Grid Size applied in the Slope Analysis(In flank of Environment)
Um, Dae Yong ; Lee, Beung Soo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 467~475
DOI : 10.7848/ksgpc.2012.30.5.467
In this study, the problems were analyzed that derived a different position evaluation results depending on the unit grid size that are applied to the terrain slope analysis conducted to assess the its position and environmental impacts in the prior environment reviewing process of golf course construction projects. For this purpose, the unit grid size were analyzed that can precisely reflect a actual terrain by analyzing the change of a slope percentage according to the change of unit grid size about 12 golf courses is currently in progress of construction work through the environmental consultation or ongoing consultation. And the consultation availability of environmental assessment was reverified by applying the unit grid size derived through this study about a study golf course. In the result of study, the bigger grid size for slope analysis is set, the greatly gradient is changed and the slope ratio of the higher elevation was lowly evaluated in comparison with actual terrain. The analytical result that most closely match the actual terrain was extracted in the case applied
of the unit grid sizes setting in this study. So, we proposed this study results to the ministry of environment and could be amended the unit grid size of
as standard for the analysis of slope. Also, if new grid size for site evaluation is applied to the study sites, 4 sites exceed the standard suggested the existing regulations and they are not proper as golf course site in flank of environment.
Monitoring the Crustal Movement Before and After the Earthquake By Precise Point Positioning - Focused on 2011 Tohoku Earthquake -
Kim, Min Gyu ; Park, Joon Kyu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 477~484
DOI : 10.7848/ksgpc.2012.30.5.477
Recently, as earthquake is more frequently taking place around the world due to diastrophism, the importance of diastrophism and disaster detection is becoming more important. In this study, to analyze the interpretation of seismic displacement by the Japanese earthquake in March, 2011, and monitor the diastrophism of plates in Japan and surrounding Eurasia, Pacific, and Philippines before and after the earthquake, the observational data from IGS observatories in Japan and Asian regions were processed by precise point positioning. The displacement was biggest in MIZU, which was the closest to the epicenter, and the earthquake-affected region was in inverse proportion to the distance from the epicenter. The result of calculating the diastrophism speed before and after the earthquake, based on precise point positioning of IGS observatories located in the 4 plates around Japan, showed that the displacement speed changed and different plates showed different results. The comparison with the plate fate model allowed to analyze the change in diastrophism by earthquake, and to understand the characteristics of the displacement of the plates around Japan. Later, a continuous diastrophism monitoring based on GPS is needed for earthquake prediction and diastrophism research, and the data gained by continuous GPS-based monitoring of diastrophism will be fully used as basic data for relevant research and earthquake disaster management.
Verification of Spatial Resolution in DMC Imagery using Bar Target
Lee, Tae Yun ; Lee, Jae One ; Yun, Bu Yeol ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 485~492
DOI : 10.7848/ksgpc.2012.30.5.485
Today, a digital airborne imaging sensor plays an important role in construction of the numerous National Spatial Data Infrastructure. However, an appropriate quality assesment procedure for the acquired digital images should be preceded to make them useful data with high precision and reliability. A lot of studies therefore have been conducted in attempt to assess quality of digital images at home and abroad. In this regard, many test fields have been already established and operated to calibrate digital photogrammetric airborne imaging systems in Europe and America. These test fields contain not only GCPs(Ground Control Points) to test geometric performance of a digital camera but also various types of targets to evaluate its spatial and radiometric resolution. The purpose of this paper is to present a method to verify the spatial resolution of the Intergraph DMC digital camera and its results based on an experimental field testing. In field test, a simple bar target to be easily identified in image is used to check the spatial resolution. Images, theoretically designed to 12cm GSD(Ground Sample Distance), were used to calculate the actual resolution for all sub-images and virtual images in flight direction as well as in cross flight direction. The results showed that the actual image resolution was about 0.6cm worse than theoretically expected resolution. In addition, the greatest difference of 1.5cm between them was found in the image of block edge.
Development of Korean Geoid Model and Verification of its Precision
Lee, Jisun ; Kwon, Jay Hyoun ; Baek, Kyeong Min ; Moon, Jiyeong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 5, 2012, Pages 493~500
DOI : 10.7848/ksgpc.2012.30.5.493
The previous geoid model developed in early 2000s shows 14cm level of precision due to the problems on distribution, and quality of the land gravity and GPS/Leveling data. From 2007, the new land and airborne gravity data as well as GPS/Leveling data having high quality and regular distribution has been obtained. In 2011, a new gravimetric geoid model has been constructed with precision of 5.29cm which was improved about 27% comparing to the previous model. However, much more land gravity data has been collected at the control point, bench marks and triangulation points since 2010. Also, GPS/Leveling data having 10km spacing over whole country has been obtained through the project which is for the construction of new control points. In this study, new gravimetric geoid has been calculated based on the all available gravity data up to present. The geoid height shows the range from 18.05m to 32.70m over whole country and its precision is 5.76cm. The degree of fit and precision of hybrid geoid model are 3.60cm and 4.06cm, respectively. At the end, 3.35cm of the relative precision in 15km baseline has been calculated to confirm its practical usage. Especially, it has been founded that regional bias occurred at the Kangwon and coastal area due to problems on the leveling data. Also, some inland points show inconsistent large difference which needs to be verified by analyzing the unified control points results.