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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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Accuracy Investigation of RPC-based Block Adjustment Using High Resolution Satellite Images GeoEye-1 and WorldView-2
Choi, Sun-Yong ; Kang, Jun-Mook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 107~116
DOI : 10.7848/ksgpc.2012.30.2.107
We investigated the accuracy in three dimensional geo-positioning derived by four high resolution satellite images acquired by two different sensors using the vendor-provided rational polynomial coefficients(RPC) based block adjustment in this research. We used two in-track stereo pairs of GeoEye-1 and WorldView-2 satellite and DGPS surveying data. In this experiment, we analyzed accuracies of RPC block adjustment models of two kinds of homogeneous stereo pairs, four kinds of heterogeneous stereo pairs, three 3 triplet image pairs, and one quadruplet image pair separately. The result shows that the accuracies of the models are nearly same. The accuracy without any GCPs reaches about CEP(90) 2.3m and LEP(90) 2.5m and the accuracy with single GCP is about CEP(90) 0.3m and LEP(90) 0.5m.
Analysis of Sunshine Amount for Education Environment according to Installation of Apartment Structures
Jang, Ho-Sik ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 117~124
DOI : 10.7848/ksgpc.2012.30.2.117
Due to recent urban maintenance project for the aged towns, the reconstruction of apartments into super-high-rise and high-rise apartment structures has been approved for concentrated use of land, and accordingly the infringement on sunshine for nearby residential area is rising as a social issue. Especially the educational environment conditions according to infringement on sunshine in educational facilities are posing many problems. Accordingly in this study, for such sunshine analysis of educational environment, Auto
software has been used to construct the 3D model for the educational facility structures. And with the simulation technique, the windows and the schoolyard of the education facility were set to be the lighting standard surface to take measurements for the sunshine environment of the educational facilities by the minute from 8:00AM until 4:00PM for the sunshine amount by true solar time according to the movement of the sun. Also, the sunshine environment of the education facility according to the damage before/after new construction of apartments was charted, and through comparison with the video produced by sun shadow projection method, the sunshine amount of the educational environment could be verified. In future, it is expected to be efficiently used in the sunshine analysis of education environment utilizing such simulation techniques.
Detection of M:N corresponding class group pairs between two spatial datasets with agglomerative hierarchical clustering
Huh, Yong ; Kim, Jung-Ok ; Yu, Ki-Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 125~134
DOI : 10.7848/ksgpc.2012.30.2.125
In this paper, we propose a method to analyze M:N corresponding relations in semantic matching, especially focusing on feature class matching. Similarities between any class pairs are measured by spatial objects which coexist in the class pairs, and corresponding classes are obtained by clustering with these pairwise similarities. We applied a graph embedding method, which constructs a global configuration of each class in a low-dimensional Euclidean space while preserving the above pairwise similarities, so that the distances between the embedded classes are proportional to the overall degree of similarity on the edge paths in the graph. Thus, the clustering problem could be solved by employing a general clustering algorithm with the embedded coordinates. We applied the proposed method to polygon object layers in a topographic map and land parcel categories in a cadastral map of Suwon area and evaluated the results. F-measures of the detected class pairs were analyzed to validate the results. And some class pairs which would not detected by analysis on nominal class names were detected by the proposed method.
Parallel Processing of Airborne Laser Scanning Data Using a Hybrid Model Based on MPI and OpenMP
Han, Soo-Hee ; Park, Il-Suk ; Heo, Joon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 135~142
DOI : 10.7848/ksgpc.2012.30.2.135
In the present study, a parallel processing method running on a multi-core PC-Cluster is introduced to produce digital surface model (DSM) and digital terrain model (DTM) from huge airborne laser scanning data. A hybrid model using both message passing interface (MPI) and OpenMP was devised by revising a conventional MPI model which utilizes only MPI, and tested on a multi-core PC-Cluster for performance validation. In the results, the hybrid model has not shown better performances in the interpolation process to produce DSM, but the overall performance has turned out to be better by the help of reduced MPI calls. Additionally, scheduling function of OpenMP has revealed its ability to enhance the performance by controlling inequal overloads charged on cores induced by irregular distribution of airborne laser scanning data.
An Analysis of Similarity Measures for Area-based Multi-Image Matching
Noh, Myoung-Jong ; Kim, Jung-Sub ; Cho, Woo-Sug ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 143~152
DOI : 10.7848/ksgpc.2012.30.2.143
It is well-known that image matching is necessary for automatic generation of 3D data such as digital surface data from aerial images. Recently developed aerial digital cameras allow to capture multi-strip images with higher overlaps and less occluded areas than conventional analogue cameras and that much of researches on multi-image matching have been performed, particularly effective methods of measuring a similarity among multi-images using point features as well as linear features. This research aims to investigate similarity measuring methods such as SSD and SNCC incorporated into a area based multi-image matching method based on vertical line locus. In doing this, different similarity measuring entities such as grey value, grey value gradient, and average of grey value and its gradient are implemented and analyzed. Further, both dynamic and pre-fixed adaptive-window size are tested and analyzed in their behaviors in measuring similarity among multi-images. The aerial images used in the experiments were taken by a DMC aerial frame camera in three strips. The over-lap and side-lap are about 80% and 60%, respectively. In the experiment, it was found that the SNCC as similarity measuring method, the average of grey value and its gradient as similarity measuring entity, and dynamic adaptive-window size can be best fit to measuring area-based similarity in area based multi-image matching method based on vertical line locus.
Shape similarity measure for M:N areal object pairs using the Zernike moment descriptor
Huh, Yong ; Yu, Ki-Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 153~162
DOI : 10.7848/ksgpc.2012.30.2.153
In this paper, we propose a new shape similarity measure for M:N polygon pairs regardless of different object cardinalities in the pairs. The proposed method compares the projections of two shape functions onto Zernike polynomial basis functions, where the shape functions were obtained from each overall region of objects, thus not being affected by the cardinalities of object pairs. Moments with low-order basis functions describe global shape properties and those with high-order basis functions describe local shape properties. Therefore several moments up to a certain order where the original shapes were similarly reconstructed can efficiently describe the shape properties thus be used for shape comparison. The proposed method was applied for the building objects in the New address digital map and a car navigation map of Seoul area. Comparing to an overlapping ratio method, the proposed method`s similarity is more robust to object cardinality.
Shadow Extraction of Urban Area using Building Edge Buffer in Quickbird Image
Yeom, Jun-Ho ; Chang, An-Jin ; Kim, Yong-Il ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 163~171
DOI : 10.7848/ksgpc.2012.30.2.163
High resolution satellite images have been used for building and road system analysis, landscape analysis, and ecological assessment for several years. However, in high resolution satellite images, shadows are necessarily cast by manmade objects such as buildings and over-pass bridges. This paper develops the shadow extraction procedures in urban area including various land-use classes, and the extracted shadow areas are evaluated by a manually digitized shadow map. For the shadow extraction, the Canny edge operator and the dilation filter are applied to make building edge buffer area. Also, the object-based segmentation was performed using Gram-Schmitt fusion image, and spectral and spatial parameters are calculated from the segmentation results. Finally, we proposed appropriate parameters and extraction rules for the shadow extraction. The accuracy of the shadow extraction results from the various assessment indices is 80% to 90%.
Non-Metric Digital Camera Lens Calibration Using Ground Control Points
Won, Jae-Ho ; So, Jae-Kyeong ; Yun, Hee-Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 173~180
DOI : 10.7848/ksgpc.2012.30.2.173
The most recent, 80 mega pixels digital camera appeared through the development of digital technology, and nonmetric digital cameras have been using in various field of photogrammetry. In this study, we experimented lens calibration using aerial photographs and ground control points. The aerial photographs were taken a non-metric digital camera which is CMOS(Complementary Metal Oxide Semiconductor) 21.1 mega pixels sensor and 35mm lens at a helicopter. And the ground control points were selected on the 1:1,000 plotting origin data. As a result, we calculated focal length, PPA(Principal Point of Autocollimation) and symmetric radial distortion coefficients from the lens. Also, RMSE(root mean square error) and maximum residual of the ground control points from the aerial triangulation were compared before and after calibration. And we found that the accuracy of the after calibration was improved very significantly.
Geometric calibration of digital photogrammetric camera in Sejong Test-bed
Seo, Sang-Il ; Won, Jae-Ho ; Lee, Jae-One ; Park, Byoung-Uk ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 181~188
DOI : 10.7848/ksgpc.2012.30.2.181
The most recent, Digital photogrammetric camera, Airborne LiDAR and GPS/INS same sensors are used to acquire spatial information of various kinds in the field of aerial survey. In addition, Direct Georeferencing technology has been widely utilized with digital photogrammetric camera and GPS/INS. However, the sensor Calibration to be performed according to the combination of various sensors is followed by problems. Most of all, boresight calibration of integrated sensors is a critical element in the mapping process when using direct georeferencing or using the GPS/INS aerotriangulation. The establishment of a national test-bed in Sejong-si for aerial sensor calibration is absolutely necessary to solve this problem. And accurate calibration with used to integration of GPS/INS by aerotriangulation of aerial imagery was necessary for determination of system parameters, evaluation of systematic errors. Also, an investigation of efficient method for Direct georeferencing to determine the exterior orientation parameters and assessment of geometric accuracy of integrated sensors are performed.
Investigating Ways of Developed and Undeveloped Features from Satellite Images -Balancing Coastal Development and Preservation-
Yang, Byung-Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 189~197
DOI : 10.7848/ksgpc.2012.30.2.189
This research attempted to find possibilities of the practical use utilizing geospatial methods for the balanced promotion of sustainable coastal development and preservation through a case study of Jekyll Island, one of Georgia`s barrier islands. In response, this research provided ways for practical use in sustainable development and preservation plans. First this research thoroughly investigated the 1996 master plan of Jekyll Island and tried to recalculate developed and undeveloped areas. Second, new estimations for developed areas were investigated through field survey. Third, this research proposed the use of the satellite images with different levels of spatial resolutions and tested different classification schemes to find possibilities for practical use. For these purposes, first, we classified developed and undeveloped features by manual digitization using an aerial photo image with 0.5m spatial resolution. Second, a Landsat 7 ETM+ and a QuickBird satellite images with mid- and high-levels of spatial resolutions were applied to identify developed and undeveloped areas using both the National Land Cover Data (NLCD) and the Coastal Change Analysis Program (CCAP) classification schemes. Also, GEOBIA (Geographic Object-Based Image Analysis) was conducted to accurately identify developed and undeveloped areas.
Configuration of GNSS CORS Network(EAREF) for Earth Observations in the East-Asia Region
Lee, Young-Jin ; Jung, Kwang-Ho ; Lee, Myeong-Jun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 199~210
DOI : 10.7848/ksgpc.2012.30.2.199
This paper is designed to put forth a proposal for configuration of an optimized observation network based on GNSS CORS with a view to continued monitoring of crustal deformation in the East-Asian region. For this purpose, a comprehensive analysis of the results of the testing of various forms of GNSS CORS observation network tentatively constructed based on the Asia-Pacific IGS station has confirmed that geometrically arranged minimum five and ten or more reference points and an EAREF, constructed with a baseline length no longer than 2,500km, can produce an optimum outcome. And an EAREF-applied analysis on the effects of the Great Eastern Japan Earthquake of March 2011 shows that there were conspicuous positional movements in Japan and Korea while there was no significant movement in other regions.
Georeferencing of Indoor Omni-Directional Images Acquired by a Rotating Line Camera
Oh, So-Jung ; Lee, Im-Pyeong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 30, issue 2, 2012, Pages 211~221
DOI : 10.7848/ksgpc.2012.30.2.211
To utilize omni-directional images acquired by a rotating line camera for indoor spatial information services, we should register precisely the images with respect to an indoor coordinate system. In this study, we thus develop a georeferencing method to estimate the exterior orientation parameters of an omni-directional image - the position and attitude of the camera at the acquisition time. First, we derive the collinearity equations for the omni-directional image by geometrically modeling the rotating line camera. We then estimate the exterior orientation parameters using the collinearity equations with indoor control points. The experimental results from the application to real data indicate that the exterior orientation parameters is estimated with the precision of 1.4 mm and
for the position and attitude, respectively. The residuals are within 3 and 10 pixels in horizontal and vertical directions, respectively. Particularly, the residuals in the vertical direction retain systematic errors mainly due to the lens distortion, which should be eliminated through a camera calibration process. Using omni-directional images georeferenced precisely with the proposed method, we can generate high resolution indoor 3D models and sophisticated augmented reality services based on the models.