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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 26, Issue 6 - Dec 2008
Volume 26, Issue 5 - Oct 2008
Volume 26, Issue 4 - Aug 2008
Volume 26, Issue 3 - Jun 2008
Volume 26, Issue 2 - Apr 2008
Volume 26, Issue 1 - Feb 2008
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The Deformation Measurement of Simulated Ground using Movable Orientation Board for Photogrammetry
Lee, Hyo-Seong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 323~331
Digital close-range photogrammetric technique can measure and describe 3D geometric form from 2D image. This technique is a growing applicability in the field of sciences. Nevertheless, civil and mechanical field, which need measurements as precise as possible, use expensive measuring instruments in general. In addition there are occasions for analysis by means of visual method, since appropriate measuring instruments have been not yet available. This study therefore developed digital close-range photogrammetric technique with a movable orientation board to quickly measure deformation before and after destruction from simulated ground model of reinforced-soil wall. Then the results are compared with the measurements obtained using digital theodolite.
Effect of Prior Probabilities on the Classification Accuracy under the Condition of Poor Separability
Kim, Chang-Jae ; Eo, Yang-Dam ; Lee, Byoung-Kil ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 333~340
This paper shows that the use of prior probabilities of the involved classes improve the accuracy of classification in case of poor separability between classes. Three cases of experiments are designed with two LiDAR datasets while considering three different classes (building, tree, and flat grass area). Moreover, random sampling method with human interpretation is used to achieve the approximate prior probabilities in this research. Based on the experimental results, Bayesian classification with the appropriate prior probability makes the improved classification results comparing with the case of non-prior probability when the ratio of prior probability of one class to that of the other is significantly different to 1.0.
Automatic Change Detection of Urban Areas using LIDAR Data
Choi, Kyoung-Ah ; Lee, Im-Pyeong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 341~350
Change detection has been recognized as one of the most important steps to update city models. In this study, we thus propose a method to detect urban changes from two sets of LIDAR data acquired at different times. The main processes in the proposed method are (1) detecting change areas through subtraction between two DSMs generated from the LIDAR sets, (2) organizing the LIDAR points within the detected areas into surface patches, (3) classifying the class of each patch such as ground, vegetation, and building, and (4) determining the kinds of changes based on the properties and classes of the patches. The results which were obtained from the application of the proposed method to real data were verified as appropriate using the reference data manually acquired from the visual inspection of the orthoimages of the same area. The probability of success in change detection is assessed to 97% on an average. In conclusion, the proposed method is evaluated as a reliable, and efficient approach to change detection and thus the update of city model.
Experiment on Camera Platform Calibration of a Multi-Looking Camera System using single Non-Metric Camera
Lee, Chang-No ; Lee, Byoung-Kil ; Eo, Yang-Dam ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 351~357
An aerial multi-looking camera system equips itself with five separate cameras which enables acquiring one vertical image and four oblique images at the same time. This provides diverse information about the site compared to aerial photographs vertically. The geometric relationship of oblique cameras and a vertical camera can be modelled by 6 exterior orientation parameters. Once the relationship between the vertical camera and each oblique camera is determined, the exterior orientation parameters of the oblique images can be calculated by the exterior orientation parameters of the vertical image. In order to examine the exterior orientation of both a vertical camera and each oblique cameras in the multi-looking camera relatively, calibration targets were installed in a lab and 14 images were taken from three image stations by tilting and rotating a non-metric digital camera. The interior orientation parameters of the camera and the exterior orientation parameters of the images were estimated. The exterior orientation parameters of the oblique image with respect to the vertical image were calculated relatively by the exterior orientation parameters of the images and error propagation of the orientation angles and the position of the projection center was examined.
Research for Generation of Accurate DEM using High Resolution Satellite Image and Analysis of Accuracy
Jeong, Jae-Hoon ; Lee, Tae-Yoon ; Kim, Tae-Jung ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 359~365
This paper focused on generation of more accurate DEM and analysis of accuracy. For this, we applied suitable sensor modeling technique for each satellite image and automatic pyramid matching using image pyramid was applied. Matching algorithm based on epipolarity and scene geometry also was applied for stereo matching. IKONOS, Quickbird, SPOT-5, Kompsat-2 were used for experiments. In particular, we applied orbit-attitude sensor modeling technique for Kompsat-2 and performed DEM generation successfully. All DEM generated show good quality. Assessment was carried out using USGS DTED and we also compared between DEM generated in this research and DEM generated from common software. All DEM had
Mean Absolute Error and
RMS Error. Experimental results show that the DEMs of good performance which is similar to or better than result of DEMs generated from common software.
Spaceborne Monitoring Plan for Land Management
Shin, Dong-Bin ; Ahn, Jong-Wook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 367~378
The study is the establishment of spaceborne monitoring plan for land management. Spaceborne monitoring is land use change detection, tracking and forecasting process. For land management spaceborne monitoring plan are First, land monitoring system and long-term planning. Secondly, the spaceborne monitoring agency dedicated to specify. Thirdly, to educate the spaceborne monitoring the area of professional manpower. Fourth, data sharing and distribution systems to be prepared. Fifth, to establish real-time airborne monitoring systems. Sixth, to improve the relevant legal and institution. Seventh, continuing research and development of related technologies, and support.
Free-air Anomaly from a Consistent Preprocessing of Land Gravity Data in South Korea
Lee, Ji-Sun ; Lee, Bo-Mi ; Kwon, Jay-Hyoun ; Lee, Yong-Wook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 379~386
To determine the precise geoid, the quality land gravity data as well as the accurate position information of the observation points are required. Here, the land gravity data should be processed in a consistent way from the raw data level producing the quality free-air anomaly being used in the geoid determination. In this study, we processed land gravity data of KIGAM(Korea Institute of Geoscience and Mineral Resources) and Pusan national university which has precise position information acquired from GPS and raw gravity data. The conversion from readings of gravimeter to the gravity value, corrections of instrumental height and tide were carried out from the raw gravity data for each surveying session. Then, a cross-over adjustment was applied to generate a free-air anomaly for whole data with precision of 0.48 mGal. It is expected that the data processed through this study shall be a foundation on the determination of the precise geoid model in Korea.
A Proposal of a Shape Matching and Geo-referencing method for Building Features in Construction CAD Data to Digital Map using a Vertex Attributed String Matching algorithm
Huh, Yong ; Yu, Ki-Yun ; Kim, Hyung-Tae ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 387~396
An integration between construction CAD data and GIS data needs geo-referencing processes of construction CAD data whose coordinate systems are their own native or even unknown. Generally, these processes are based on manually detected conjugate-vertices. In this study, we proposed an semi-automated conjugate -vertices detection method for building features between construction CAD data and a digital map using a vertex attributed string matching algorithm. A geo-referencing function for construction CAD data based on the similarity transform could be derived with those conjugate-vertices. Using our proposed method, we overlaid geo-referenced CAD data to a digital map of the College of Engineering, Seoul National University and evaluated our method.
Analysis of the GPS Error Effect through Simulation
Jeon, Jae-Han ; Kwon, Jay-Hyoun ; Lee, Ji-Sun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 397~405
The position accuracy is primarily dependent on the satellite position and signal delay caused by several elements. To know the effect of the delay on the estimated positions, we simulated GPS raw data (RINEX) with GPS errors using Bernese ver5.0. GPS errors used in this paper are Ionospheric delay, Cycle slip, Troposphere, DOP and Random error. If the baseline is short, the position error according to TEC is not large, since the ionospheric delay effect can be removed by ion-free combination. However, if the baseline is long, 3 dimensional position error up to 10cm is occurred. The 3D position error of coordinates with cycle slip is hardly ever changed up to 60% of cycle slip. Because the simulated cycle slips are equally distributed on satellites, the positioning was not seriously affected by the cycle slip. Also, if percentage of cycle slip is 60%, three dimensional error is sharply increased over 1m. The position error is calculated by using the observation data (2 hours) which was selected by DOP less than 3. And its accuracy is more improved about
Automatic Matching of Multi-Sensor Images Using Edge Detection Based on Thinning Algorithm
Shin, Sung-Woong ; Kim, Jun-Chul ; Oh, Kum-Hui ; Lee, Young-Ran ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 407~414
This study introduces an automatic image matching algorithm that can be applied for the scale different image pairs consisting of the satellite pushbroom images and the aerial frame images. The proposed method is based on several image processing techniques such as pre-processing, filtering, edge thinning, interest point extraction, and key-descriptor matching, in order to enhance the matching accuracy and the processing speed. The proposed method utilizes various characteristics, such as the different geometry of image acquisition and the different radiometric characteristics, of the multi-sensor images. In addition, the suggested method uses the sensor model to minimize search area and eliminate false-matching points automatically.
The Study on Sensor based Service Model of Traffic Facilities
Lee, Yong-Joo ; Kim, Jy-So ; Chang, Hoon ; Jeong, Jin-Seok ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 415~421
The purpose of this study is to provide a sensor based service model for traffic facilities in u-City through analysing the present condition of urban infrastructure, especially traffic facilities management. In order to achieve this purpose, we did a comparative analysis of internal and external situation of ITS(Intelligent Transport System) and classified service for traffic facilities to 3 categories, namely traffic flow management, traffic information offering, formation of road structure. Also, we examined technological trend of USN(Ubiquitous Sensor Network). Through this process, we present a sensor based service model of traffic facilities for building sustainable road environment.
A Study on the Practical Application of Image Control Point Using Stereo Image Chip
Kim, Hoon-Jung ; Kim, Kam-Lae ; Cheong, Hae-Jin ; Cho, Won-Woo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 423~431
The control surveying which aims at identifying the coordinate system of satellite images with that of ground is a repeatedly performed essential process to produce digital ortho - photos and it acts as the main factor to increase the production cost of the photos by duplicated budgets and redundant works when executing the projects for acquiring basic geographical information from high density satellite images. During the experimentation, an application system was established for producing a stereo image chip by the analysis of DPPDB file structure, the stereo image chip was produced with SPOT and IKONOS images, the analysis of 3D modeling accuracy was performed to secure the required accuracy and to present the optimal number and deployment of the control points, and a 3D modeling was performed for new SPOT images and lastly, 3D ground coordinates were extracted by the observation of the same points through the overlapping with the new images. As the results of the research, it is proved that the stereo image chip can be used as the ground controls through the accuracy analysis between the coordinates of the images and the ground, close results were obtained between the coordinates by the ground survey and those by the 3D modeling using new images and the observation of the same points, positional changes were not found during observing the same points, and the research presented the methodology for improving the process of the control survey by showing the availability of the image controls on the stereo image chip instead of the ground controls.
A Study on Business Promotion Procedure and Service Model for Ubiquitous Sensor Network Based Ground Facility Management
Jeong, Jin-Seok ; Kim, Eui-Myoung ; Lee, Yong-Joo ; Byun, In-Sun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 433~442
This research dealt with the methodological procedures of ubiquitous sensor networks, applying to urban ground facilities. Recently Korean government established a guide, "u-City IT Infra guide v1.0" when promoting u-City implement projects. This guide conceptually included general processes about u-City mainframe in overall, but its guidance could not lead the detailed procedures and methods for specific ground facility. Therefore, this research proposed the details of the procedure for the intelligence of facilities after reviewing the existing procedures for ubiquitous city. Newly proposed procedure for the intelligence of facilities was consisted of selection of facility and sensors for intelligence, setting a level for intelligence, and suggestion of service model for the selected facility.
TIN based Matching using Stereo Airphoto and Airborne LiDAR
Kim, Hyung-Tae ; Han, Dong-Yeob ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 4, 2008, Pages 443~452
To deduce 3D linear information which express shapes of buildings out of airphoto by fusion of airphoto and LiDAR data, this research went through 2 process. First, research made LiDAR data into projected data of 2D based on airphoto. For this, the virtual points were added to solve the visual problem of building boundary area which has poor information because the attribute in LiDAR data. Research construct irregular triangular nets from modified LiDAR data and judge visual triangular nets out of image. Through this, research can make reference to information of triangular nets in each image pixel. Second, 3D information was extracted from stereo images segments by combining extracted information of visible region and 2D irregular triangular nets. Matching way based on TIN for segments from stereo images was used. Matching condition based on TIN can improve about 20% of edge matching accuracy compared to existing quadrilateral condition of epipolar geometry.