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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 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
Selecting the target year
Shadowing Area Detection in Image by HSI Color Model and Intensity Clustering
Choi, Yun-Woong ; Jang, Young-Woon ; Park, Jung-Nam ; Cho, Gi-Sung ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 455~463
The shadows, which is generated when acquiring data using optical sensor, mutilates consistency of brightness for same objects in the images. Hence, it makes a trouble to interpret the ground information. This study is focused on detecting the shadowing area in the images. And only single image is used without any other data which is acquired from different source. Also, This study presents the method using HSI color model, especially, using I(intensity) information, and the intensity clustering algorithm. Then, we illuminate the effects of shadow by FFT(Fast Fourier Transform).
The Application of Digital Close-Range Photogrammetric Linkage to Navigation System
Choi, Hyun ; Ahn, Chang-Hwan ; Hong, Soon-Heon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 465~473
Digital photogrammetric systems have been shown many possibilities to image analysis division through obtaining the independent images from the digital camera which takes storage capacity itself and treating the images in real time by digital photogrammetric measuring method. And GPS which can get 3D coordinates easily anywhere in the world is used usefully in many fields. This study is about the development of the application of digital close-range photogrammetric linkage to navigation system. The result of error on this study is analysed through comparing and analysing Sokkia GRS2600, Nikon D200+GPS101, Nikon D200+GPSmap 60CSx. The existing system indicates mean errors of coordinate 14.228m, error of altitude 8.412m and in the system used in this study, errors of coordinate and altitude is 5.837m, 5.733m each. The developed digital close-range photogrammetric linkage to navigation system maximizes convenience and usefulness, enables taking 500 photographs, one person close-range photogrammetric system within 2kg. Therefore, this study can conclude that the system
A Study on the Research Trend of Surveying in Korea
Kim, Youn-Hee ; Choi, Yun Soo ; Kang, Moon Kwon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 475~483
The purpose of this study is to figure out the research trend of surveying in Korea through the analyses of research field and the published year of surveying related papers in journals and theses of master and Ph. D. The papers and theses published since 1957 were collected and analyzed to find out the major research topics and trends with time. The analyses of research trends in terms of time showed certain correlation between research areas, for example, remote sensing is highly correlated with GIS (98%), GPS correlated with GIS(95%). Through the regression analysis, it was found that the trends of the most fields were well-fitted with a third-order polynomial except the field of Geodesy. Furthermore, it was predicted that the number of studies in general surveying, photogrammetry, remote sensing and land information will be increasing while those in GPS, GIS, digital map and Geodesy will be decreasing.
Adjustment of Exterior Orientation of the Digital Aerial Images using LiDAR Points
Yoon, Jong-Suk ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 485~491
LiDAR systems are usually incorporated a laser scanner and GPS/INS modules with a digital aerial camera. LiDAR point clouds and digital aerial images acquired by the systems provide complementary spatial information on the ground. In addition, some of laser scanners provide intensity, radiometric information on the surface of the earth. Since the intensity is unnecessary of registration and provides the radiometric information at a certain wavelength on the location of LiDAR point, it can be a valuable ancillary information but it does not deliver sufficient radiometric information compared with digital images. This study utilize the LiDAR points as ground control points (GCPs) to adjust exterior orientations(EOs) of the stereo images. It is difficult to find exact point of LiDAR corresponding to conjugate points in stereo images, but this study used intensity of LiDAR as an ancillary data to find the GCPs. The LiDAR points were successfully used to adjust EOs of stereo aerial images, therefore, successfully provided the prerequisite for the precise registration of the two data sets from the LiDAR systems.
Accuracy Analysis of Kinematic SBAS Surveying
Kim, Hye In ; Son, Eun Seong ; Lee, Ho Seok ; Kim, Hyun Ho ; Park, Kwan Dong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 493~504
Space-Based Augmentation System (SBAS), which is one of the GPS augmentation systems, is a Wide-Area Differential GPS that provides differential GPS corrections and integrity data. In this study, we did performance analysis of kinematic SBAS surveying by conducting Real-Time Kinematic (RTK), DGPS, standalone, and SBAS surveys. Considering static survey results as truth, 2-D Root Mean Square (RMS) error and 3-D RMS error were computed to evaluate the positioning accuracy of each survey method. As a result, the 3-D positioning error of RTK was 13.1cm, DGPS 126.0cm, standalone (L1/L2) 135.7cm, standalone (C/A) 428.9cm, and SBAS 109.2cm. The results showed that the positioning accuracy of SBAS was comparable to that of DGPS.
The Segmentation and the Extraction of Precise Plane Equation of Building Roof Plane using 3D Hough Transformation of LiDAR Data
Lee, Young-Jin ; Oh, Jae-Hong ; Shin, Sung-Woong ; Cho, Woo-Sug ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 505~512
The 3D Hough transformation is the one of the most powerful and popular algorithm for extracting plane parameters from LiDAR data. However, there are some problems when extracting building roof plane using 3D Hough transformation. This paper explains possible problems and solution for extracting roof plane. The algorithm defines peak plane, exact plane, and LESS plane for extracting accurate plane parameters in the accumulator of the 3D Hough transformation. The peak plane is the plane which is represented by peak in the accumulator. The exact plane is the plane which is represented by the accumulator cell which is closest to the actual plane. The LESS plane can be calculated from all LiDAR points in the exact plane by using least-square adjustment. Test results show that proposed algorithm can extracts building roof plane very accurately.
Research for Time Variation of
Using GRACE and SLR Measurements
Huang, He ; Yun, Hong-Sic ; Lee, Dong-Ha ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 513~518
The research of global-scale mass redistribution and it changed by Earth gravity filed variation observations, including Earth's oblateness
(also called low degree spherical harmonic coefficient
), is in continuous progress. Recently, the comparative analysis of geodetic observation SLR can be made by the development of GRACE and other time-variable gravity measurements. In this study,
time series changes in the value of comparative analysis was got by GRACE monthly Gravity filed model (CSR RL04) for the period April 2002 to May 2008. And comparative analysis the harmonic coefficients of
was obtained from SLR observations. Signal analysis for two time-series data was made by wavelet transform, CWT(continuous wavelet transform), XWT(cross wavelet transform) and WTC(wavelet coherence) methods. The results indicate that GRACE and SLR values for
had both decreasing trend, as well as SLR data represent the annual frequencies, and GRACE was semiannual variations. In addition, the results of GRACE and SLR had a strong correlation with the XWT and WTC in an annual cycle.
An Analysis of DEM and Gravity Effect for Precision Geoid Determination in Korea
Lee, Bo-Mi ; Lee, Ji-Sun ; Kwon, Jay-Hyoun ; Lee, Yong-Wook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 519~527
The basic elements in precise geoid determination are the gravity and topographic data with reliable quality and distribution. In this study, the effect of the gravity and topographic data on the precision of the geoid are analyzed through simulations in which the quality and distribution of the data are artificially controlled. It was found that the distribution of the topographic data has more effect on the precision of geoid than the quality of the it. This leads to the conclusion that the SRTM (Shuttle Radar Topography Mission) DTM (Digital Terrain Model) with resolution of 90m is qualified as a topographic data in geoid determination. In the experiments with gravity data, on the other hand, the aliasing effect caused by the low data density caused large errors in geoid. It was found that the more gravity data especially in north-eastern mountainous area is needed for precise geoid determination in Korea.
Positional Accuracy Analysis of Permanent GPS Sites Using Precise Point Positioning
Kang, Joon-Mook ; Lee, Yong-Wook ; Kim, Min-Gyu ; Park, Joon-Kyu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 529~536
Researches about 3-D Positioning system using GPS were carried out many-sided by national organs, laboratories, the worlds of science. And most of researches were development of relative positioning algorithm and its applications. Relative positioning has a merit, which can eliminate error in received signals. But its error increase due to distance of baseline. GPS absolute positioning is a method that decides the position independently by the signals from the GPS satellites which are received by a receiver at a certain position. And it is necessary to correct various kinds of error(clock error, effect of ionosphere and troposphere, multi-path etc.). In this study, results of PPP(Precise Point Positioning) used Bernese GPS software was compared with notified coordinates by the NGII(National Geographic Information Institute) in order to analyze the positional accuracy of permanent GPS sites. And the results were compared with results of AUSPOS - Online GPS Processing Service for comparison with relative positioning.
Development of Digital Map On-demand Updating System
Lee, Jae-Kee ; Lee, Dong-Ju ; Jung, Sung-Heuk ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 26, issue 5, 2008, Pages 537~546
The digital map has been updated in every five years in the past. However, it has been changed to make corrections and updated in every two years for metropolitan region and every four years for other regions since year 2008. Although, the correctness and reliability were decreased and updating work is being delayed due to the updating work in a lump. The period update spends a lot of money because this method uses aerial photogrammetry, and the digital map has the time gap between periods. Therefore, this study provides information necessary for digital map produced by the government and develops digital map production system based on objects which can be updated frequently in order to save state and local government budgets that double investment are generated to update digital map. In order to analyze usefulness of the developed system, subject area was selected and errors of updated data were analyzed. As the result of analysis, checked 66 errors were corrected and saved in the database.