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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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Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography
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Volume & Issues
Volume 29, Issue 6 - Dec 2011
Volume 29, Issue 5 - Oct 2011
Volume 29, Issue 4 - Aug 2011
Volume 29, Issue 3 - Jun 2011
Volume 29, Issue 2 - Apr 2011
Volume 29, Issue 1 - Feb 2011
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A Application Method of Plotting Original Data
Lee, Yong-Wook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 441~448
DOI : 10.7848/ksgpc.2011.29.5.441
Lately, digital restitution was became common using digital aerial photos. Therefore, we can obtain three-dimensional data. As a plotting-maker is checked by naked eye, plotting original data is very useful for making reliable three-dimensional data including contour and elevation point layers. In this study, we want to make precise and accurate digital elevation model using plotting original data. Contour and elevation point layers was extracted in digital map and break line was extracted in plotting original data. And then, compared both of results. For comparison, we selected slight slope and complex topography area like a residence area, mountain and agricultural land. We extracted break line deleting layer until obtaining ideal digital elevation model. As the results, We could extract contour, elevation points, eight road and two boundary layers using break lines. And We could obtain precise elevation model. Editing break lines, the distortion of digital elevation model could be minimized in the complex and sharp slope area.
A Performance Analysis of the SIFT Matching on Simulated Geospatial Image Differences
Oh, Jae-Hong ; Lee, Hyo-Seong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 449~457
DOI : 10.7848/ksgpc.2011.29.5.449
As automated image processing techniques have been required in multi-temporal/multi-sensor geospatial image applications, use of automated but highly invariant image matching technique has been a critical ingredient. Note that there is high possibility of geometric and spectral differences between multi-temporal/multi-sensor geospatial images due to differences in sensor, acquisition geometry, season, and weather, etc. Among many image matching techniques, the SIFT (Scale Invariant Feature Transform) is a popular method since it has been recognized to be very robust to diverse imaging conditions. Therefore, the SIFT has high potential for the geospatial image processing. This paper presents a performance test results of the SIFT on geospatial imagery by simulating various image differences such as shear, scale, rotation, intensity, noise, and spectral differences. Since a geospatial image application often requires a number of good matching points over the images, the number of matching points was analyzed with its matching positional accuracy. The test results show that the SIFT is highly invariant but could not overcome significant image differences. In addition, it guarantees no outlier-free matching such that it is highly recommended to use outlier removal techniques such as RANSAC (RANdom SAmple Consensus).
Application of 3D Chain Code for Object Recognition and Analysis
Park, So-Young ; Lee, Dong-Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 459~469
DOI : 10.7848/ksgpc.2011.29.5.459
There are various factors for determining object shape, such as size, slope and its direction, curvature, length, surface, angles between lines or planes, distribution of the model key points, and so on. Most of the object description and recognition methods are for the 2D space not for the 3D object space where the objects actually exist. In this study, 3D chain code operator, which is basically extension of 2D chain code, was proposed for object description and analysis in 3D space. Results show that the sequence of the 3D chain codes could be basis of a top-down approach for object recognition and modeling. In addition, the proposed method could be applicable to segment point cloud data such as LiDAR data.
Evaluation of Quality Improvement Achieved by Deterministic Image Restoration methods on the Pan-Sharpening of High Resolution Satellite Image
Byun, Young-Gi ; Chae, Tae-Byeong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 471~478
DOI : 10.7848/ksgpc.2011.29.5.471
High resolution Pan-sharpening technique is becoming increasingly important in the field of remote sensing image analysis as an essential image processing to improve the spatial resolution of original multispectral image. The general scheme of pan-sharpening technique consists of upsampling process of multispectral image and high-pass detail injection process using the panchromatic image. The upsampling process, however, brings about image blurring, and this lead to spectral distortion in the pan-sharpening process. In order to solve this problem, this paper presents a new method that adopts image restoration techniques based on optimization theory in the pan-sharpening process, and evaluates its efficiency and application possibility. In order to evaluate the effect of image restoration techniques on the pansharpening process, the result obtained using the existing method that used bicubic interpolation were compared visually and quantitatively with the results obtained using image restoration techniques. The quantitative comparison was done using some spectral distortion measures for use to evaluate the quality of pan-sharpened image.
A Study on Estimates to Longevity Population of Small Area and Distribution Patterns using Vector based Dasymetric Mapping Method
Choi, Don-Jeong ; Kim, Young-Seup ; Suh, Yong-Cheol ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 479~485
DOI : 10.7848/ksgpc.2011.29.5.479
A number of case studies that find distribution of longevity population and influencing factors through the spatial data fusion using GIS techniques are growing. The majority cases of these studies are adopt census administrative boundary data for the spatial analysis. However, these methods cannot fully explain the phenomenon of longevity because there are a variety of spatial characteristics within the census administrative boundaries. Therefore, studies of spatial unit are required that realistically reflect the phenomenon of human longevity. The dasymetric mapping method enables to product of spatial unit more realistic than census administrative boundary map and statistic estimates of small area utilizing diversity spatial information. In this study, elderly population of small area has been estimated within statistically significant level that applied the vector based dasymetric mapping method. Also, the cluster analysis confirmed that the variation of local spatial relationship within census administrative boundary. The result of this study implied that the need for local-level studies of the human longevity and the validity of the dashmetric mapping techniques.
Extraction of Changed Pixels for Hyperion Hyperspectral Images Using Range Average Based Buffer Zone Concept
Kim, Dae-Sung ; Pyen, Mu-Wook ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 487~496
DOI : 10.7848/ksgpc.2011.29.5.487
This study is aimed to perform more reliable unsupervised change detection through the re-extraction of the changed pixels which were extracted with global thresholding by applying buffer zone concept. First, three buffer zone was divided on the basis of the thresholding value which was determined using range average and the maximum distance point from a straight line. We re-extracted the changed pixels by performing unsupervised classification for buffer zone II which consists of changed pixels and unchanged pixels. The proposed method was implemented in Hyperion hyperspectral images and evaluated comparing to the existing global thresholding method. The experimental results demonstrated that the proposed method performed more accuracy change detection for vegetation area even if extracted slightly more changed pixels.
Analysis on Connection of Information Infra for Efficient Ubiquitous-service Realization
Choi, Pill-Soon ; Kang, Joon-Mook ; Park, Joon-Kyu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 497~507
DOI : 10.7848/ksgpc.2011.29.5.497
Ubiquitous city which was appeared since 2006 is defined as "The city provided the ubiquitous city service anytime and anywhere using ubiquitous urban infrastructure to improve the city`s competitiveness and quality of life" under ubiquitous city construction law. To realize the ubiquitous city, the city has to be constructed efficiently based on the spatial information. And connection of information achieve effective synergy. In this study, applied multilateral analysis to spatial information and administrative information to implement u-service focused on MACCA(Multifunctional Administrative City Construction Agency). Study about main function and product data with connection process of Korean Land Spatialization System and administrative information System was performed. Also, details of u-service and method of acquiring necessary data were derived. In Addition, the information connection possibility for efficient u-service realization was suggested by linkage analysis method to utilize the related information infrastructure jointly.
Improvement of Regulations for Effective UAV operation in Disaster Detection
Kim, Jong-Bai ; Kim, Min-Gyu ; Yun, Hee-Cheon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 509~517
DOI : 10.7848/ksgpc.2011.29.5.509
Recently, large scale of the damage from the natural disasters are occurring frequently such as Japanese and New Zealand`s earthquake. Collecting information quickly and accurately from damaged area is important for effective react in emergency situations. UAV is effective method to collect information because it can fly low attitude and spend small operational costs/time. In this study, collecting data about the UAV regulations are analyzed for effective UAV operation in disaster detection. And Improvement of Regulations were proposed about Problem of UAV Operation. Regulation of UAV for disaster detecting is not exist. But It`s possible to classify into Ultra Light Plane. So addition of some clauses like definition, scope and air-borne equipment for UAV will be needed. Also, it is difficult to manage effectively because of process about flight permission, therefore it is need to enact exceptional regulations to solve this problem. More analytical research based on applications of UAV operation for disaster detection will be present improvement of disaster detection and damage investigation.
Atmospheric Correction and Velocity Aberration for Physical Sensor Modeling of High-Resolution Satellite Images
Oh, Jae-Hong ; Lee, Chang-No ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 519~525
DOI : 10.7848/ksgpc.2011.29.5.519
High-resolution earth-observing satellites acquire substantial amount of geospatial images. In addition to high image quality, high-resolution satellite images (HRSI) provide unprecedented direct georegistration accuracy, which have been enabled by accurate orbit determination technology. Direct georegistration is carried out by relating the determined position and attitude of camera to the ground target, i.e., projecting an image point to the earth ellipsoid using the collinearity equation. However, the apparent position of ground target is displaced due to the atmosphere and satellite velocity causing significant georegistration bias. In other words, optic ray from the earth surface to satellite cameras at 400~900km altitude refracts due to the thick atmosphere which is called atmospheric refraction. Velocity aberration is caused by high traveling speed of earth-observing satellites, approximately 7.7 km/s, relative to the earth surface. These effects should be compensated for accurate direct georegistration of HRSI. Therefore, this study presents the equation and the compensation procedure of atmospheric refraction and velocity aberration. Then, the effects are simulated at different image acquisition geometry to present how much bias is introduced. Finally, these effects are evaluated for Quickbird and WorldView-1 based on the physical sensor model.
Analysis of Quantitative Topographical Change in Eulsuk-Island Using Aerial Images
Lee, Jae-One ; Song, Yu-Jin ; Kim, Yong-Suk ; Park, Hong-Joo ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 527~534
DOI : 10.7848/ksgpc.2011.29.5.527
This paper describes an analysis of topographical changes to the Eulsuk-Island at the Nakdong River Estuary using a long-term dataset of high resolution aerial images from 1983 to 2007. Ground control surveying was performed at some feature points using GPS(Global Positioning System) to accomplish AT(Aerial Triangulation) for past aerial images. Even if some still existing feature points appeared on old aerial images were used as GCPs(Ground Control Points) for past aerial images in AT, its accuracy reached at 1m level. Since then, a quantitative analysis of topographical changes was conducted on digital orthophotos produced by a series of aerial images taken by different years. The change volume of total area, construction, vegetation, buildings and roads could be extracted per each period in study area. The total area decreased from 1983 to 1992, but it has not almost changed since 1992. According to the continuous development, the area of vegetation has steadily decreased, while that of buildings and roads has generally increased. The result of this study can provide us with invaluable base data for further topographical change monitoring in Eulsuk-Island and Nakdong River estuary caused by continuous development in this area.
The Estimation of Debris Flow Behaviors in Injae Landslide Area
Kim, Gi-Hong ; Hwang, Jae-Seon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 535~541
DOI : 10.7848/ksgpc.2011.29.5.535
A debris flow is caused by torrential rain in mountainous regions and carries mixture of fragmental matter from slope failure, deposit soils from a valley floor and a large amount of water. It seriously damages facilities, houses, and human lives in its path. We tried to apply debris flow behavior estimation model developed in foreign country to domestic case. The study area is Inje-county, Gangwon-do and aerial photos and GPS surveying were used to collect information of starting and end point of the landslide and debris flow. The analysis showed that L/H for forecasting the travel distances of debris flows has the mean of 4.93 and standard deviation of 0.98. This model tended to overestimate the scale and extent of debris flows. In Inje-county`s case, a debris flow is caused by multiple simultaneous small-scale landslide. This is quite different from the foreign cases in which a large-scale landslide cause a large-scale debris flow. Thus, an empirical model suitable for domestic conditions needs to be developed.
Gravity modeling and application to the gravity referenced navigation
Lee, Ji-Sun ; Kwon, Jay-Hyoun ; Yu, Myeong-Jong ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 5, 2011, Pages 543~550
DOI : 10.7848/ksgpc.2011.29.5.543
The gravity anomaly is a basic geophysical data applied in various fields such as geophysics, geodesy and national defense. In general, the gravity anomaly is used through a interpolation process based on the constructed database. The gravity variation, however, is appeared in various shapes depending on the topography and the density of the underground structures. Therefore, the interpolation could lead to a large differences if the gravity fields do not satisfy the assumptions on the signal behavior like linear or a certain degree polynomials. Furthermore, the interpolation does not reflect the physical characteristics of the gravity such as the harmonic condition. In this study, the gravity modeling using the plane Fourier series and radial basis functions are performed to overcome the problems in the usual interpolation. The results of the modeling is analyzed for the case of the gravity referenced navigation focused on the signal characteristics. Based on the study, it was found that the results from modeling are not much different to that from the interpolation in a smoothly varied area. In case of the highly varied area, however, a large differences are appeared among the three methods. Especially, the Fourier series shows the most smooth variations in the modeled gravity values while the highest variations appeared in the interpolation. Applying to the gravity referenced navigation, it was found that the modeling is more effective in calculation cost. It is considered that the results from this study provides a basis on effective modeling of the gravity fields in terms of the signal characteristics and resolution for various application fields.