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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 20, Issue 4 - Dec 2002
Volume 20, Issue 3 - Sep 2002
Volume 20, Issue 2 - Jun 2002
Volume 20, Issue 1 - Mar 2002
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Accuracy Assessment of DTM by Airborne Laser Mapping System
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 105~110
For the accuracy assessment of DTM obtained by Airborne Laser Mapping Systems (ALMS), we selected 500 m spaced test points and analyze the accuracy of the DTM by various methods including GPS survey. To estimate the height at the point in between the test points of the DTM we produced a TIN, and to analyze the accuracy we use a GPS coverage map overlaid with the TIN. Compared with the existing method, DTM by ALMS is shown to be relatively accurate, and therefore, ALMS is applicable to 1/5000 digital terrain mapping.
A Study on the Calculation of the Area through the Three Dimensional Terrain Model
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 111~118
These days, surveying instruments are developing rapidly and the precision is improving continuously. The building of three dimensional terrains of high precision are possible and the calculation of the areas or the volumes have high precision due to the development of the technique of the spatial information system using computer. But actually, in construction site they calculate two-dimensional area using the traditional method, plate table surveying, planimeter, and then get three-dimensional area through multiplying two-dimensional area by the slope correction factor. In this study, we show the defect and inefficiency of the calculation of area by the traditional methods and survey the area with Electric Distance Measurement and GPS instrument. With this data, we made the three dimensional terrain model and calculated two-dimensional area, three-dimensional area. After that, we compared areas that calculated by algorithm of triangulated irregular network and analysis of grid method with standard area that calculated by the traditional method. Finally, this paper suggested more effective and precious method in calculating three-dimensional area.
Construction of Three Dimensional Virtual City Information Using the Web 3D
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 119~126
Recently, as advancing the technologies for Web 3D and Virtual Reality, the studies have been progressed actively to provide three dimensional information on the web. Especially, the various applications for providing urban information in 3D space have been developed using EAI(External Authoring Interface) that serves an interface between VRML(Virtual Reality Modeling Language), standard language for embodying virtual reality, and JAVA applet in HTML. In this study, as constructing 3D virtual city information using Digital Map, IKONOS satellite image, VRML and so on, we could provide users which need several information with building location and various urban living information. In addition, applying 3D skills such as texturing, panorama and navigation, users were enabled to perform various route searching and scenery analysis. Finally, to serve urban living information in real time, we designed to search information faster through interfacing database and to update data using ASP(Active Server Page) on web.
The Evaluation on Accuracy of LiDAR DEM by Plotting Map
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 127~136
DEM(Digital Elevation Model) is used widely in image processing, water resources, construction, GIS, landscape architecture, telecommunication, military operations and other related areas. And it is used especially in producing ortho-photo based on specific DEM and developing 3D GIS database vividly. As LiDAR(Light and Detection And Ranging) system emerged recently, DEM could be developed in urban area more efficiently and more economically, compared to the conventional DEM Production. Traditional method using check points for elevation has tome limitations in structure's height accuracy by LiDAR, because it uses only terrain height. Accordingly after the downtown of Chungju city was selected as a test field in this paper and DEM and digital ortho images was produced by way of LiDar survey, the accuracy was evaluated through analytical plotting map. The result shows that in case of buildings in LiDAR DEM, the accuracy is 0.30 m in X, 0.62 m in Y and RMS is 1.17 m. The difference distribution between DEM and plotting map in range of
10 cm was 36.2% and
20 cm was 43.53%. The accuracy of LiDAR in this study meets 1/5,000 which is the regulation for map of NGI(National Geography Institute) and LiDAR can be possibly used in many other applied area.
Digital Orthophoto Generation from LIDAR Data
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 137~143
In this study we generated digital orthophoto from LIDAR data. To generate digital orthophoto, we make TIN from raw laser scanning data(XYZ point data) and compiled DSM from this TIN. In this procedure much noise appeared along the break lines in DSM and this can give bad effect to the quality of digital orthophoto. Therefore, we applied various techniques which can refine the break line. In the result, we concluded that the fusion of LIDAR DEM of lowland and extracted buildings was adequate to generating DSM. So we generated the digital orthophoto from DSM generated from this technique. In the result of quality test, the positional accuracy of this digital orthophoto was better than the positional accuracy of 1:5,000 map.
A Study on the Detection of Land Cover Changes in Southern Han River Using Landsat Images
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 145~153
Reforming land is an important foundation for benefit of society as well as national development. A correct investigation and information acquirement as to land must go first to establish land management and plan. Land investigation by remote sensing is one of the most reasonable methods that doesn't need lots of time and manpower. In this study, Image classification on land use from Landsat data was carried out, which were respectively in 1980, 1985, 1990, 1995 and 2000, covering southern Han river and then land use changes were detected. In addition, an available information was reported, which could be used in the control of southern Han river. As a result, there is an obvious change in land use, especially the increase of water and decrease of forest and agriculture. Those are caused by the industrialization and the construction of dam.
The Application of RFM for Geometric Correction of High-Resolution Satellite Image Data
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 155~164
In this study, in order to discuss the geometric correction methods of high-resolution IKONOS satellite image, the existing polynomial model and RFM which is able to rectify satellite image without auxiliary data are applied to IKONOS satellite image data. Then the accuracy of ground point versus number of GCPs and each order of RFM are assessed. A numerical instability is removed by application of Tikhonov regularization method. As the results of this study, the root mean square errors of RFM is decreased more than 2 pixels in comparison with the two dimensional polynomial model.
Assessment of Relative Accuracy for Inaccessible Area Imagery Using Biased Ground Control Points
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 165~170
For the inaccessible area where the field verification is unable, it is difficult to obtain the ground control points (GCPs) or the acquired GCPs may be inaccurate. In general systematic geometric correction is achieved by utilizing orbit ephemeris and three axis attitude data of the satellite. however, this method results to poor accuracy of the imagery's absolute coordinates. To improve the absolute accuracy as well as the relative accuracy, we added the accessible region into the inaccessible area. We obtained GCPs in the accessible region by the fast static GPS survey and made geometric corrections with these biased GCPs. Because the biased GCPs show a pattern of coordinate errors, we analyzed this tendency to track the estimated errors in the inaccessible area.
The Study for the Quality Improvement of Underground Utility Map
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 171~181
As the result of the analysis of the underground utility map made before, we could have divided the kind of errors into the two types, position error of geometric data and attribute error and knew the fact that mainly position error is derived from the process of detecting and surveying the underground utility, and attribute is inputting data. In this study we showed the way improving accuracy in detecting and surveying underground utility by field test, and the way to reduce attribute error by process refinement.
Extraction of Highway′s Superelevation Using GPS Real Time Kinematic Surveying
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 183~190
This study is about the extraction of highway's superelevation using real time kinematic surveying among of GPS surveying methods which is economic method to construct data base in the side of highway maintain management. Using the developed vehicle, center line and shoulder of highway are measured and enough precision is obtained after analyzing the result. The result is show that 1.3 cm to 2.0 cm error in the clothed and about 0.8 cm to 1.2 cm error in the circular curve. Those errors are proved error to lane making during construction. This study is expected to become efficient method for extraction of highway alignment elements in the Mobile Mapping System.
The Implementation of 3D Measurement System by Image Pointing Method
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 191~197
Recently, with the eye-opening progress in the related field of computer, the development of high resolution digital camera enables more precise positioning in digital photogrammetry, and a lot of interest has been concentrated on its application. In this study, the algorithm and system which enable the measurement of 3D point more easily was developed by image pointing method using digital image, when the digital map of the Cultural Properties of Architectures in Modern Ages is drawn by photogrammetry. As a result, we can reduce the limitation of surveying control point, exposure condition, and construct the digital map and 3D model of architecture more efficiently.
The Quantification Research of Multi-Factors for Route Determination Using AHP Technique
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 199~206
The application of GSIS for most route determination is provided by selecting several basic data such as land use, land construction quantity and land price, and then establishing a database to analyze for the route determination. However, this strategy rarely considers the complicated multi-factors that are essential for route determination. To solve this problem, it is required to use the GSIS and attempt to support the decision of majority for optimum route determination and standardize the route determination procedure. Accordingly, in this study, the qualification of multi-factors was attempted using the AHP technique, and so the data for the route determination was provided effectively, which resulted in the optimum route determination. As a result of applying the AHP technique, optimum routes were selected more rationally than randomly applying the values of multi-factors as before.
Estimation of Coastal Terrain Differences Using the Chart
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 207~214
Development of the shore in western sea is decreasing of silt and is threatening sea ecosystem. Large size land-reclamation work by industralization have caused weather changes and sea changes, and have generated much changes topography of sea bottom and coastline. Also, It is influencing to route of ship. In this research, line for 0 m, 2 m, and coastline of land portion is digitalized. It is divided in four block, and is analyzed severally to know the degree of coastal changes by new airport construction, new town construction, and tide embankment construction.
Estimation of Tropospheric Water Vapor using GPS Observation
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 20, issue 2, 2002, Pages 215~222
As the GPS signals propagate from the GPS satellites to the receivers on the ground, they are delayed by the atmosphere. The tropospheric delay consists of two components. The hydrostatic (or "dry") component that is dependent on the dry air gasses in the atmosphere and accounts for approximately 90% of the delay. And the "wet" component that depends on the moisture content of the atmosphere and accounts for the remaining effect of the delay. The Zenith Hydrostatic Delay (ZHD) can be calculated from the local surface pressure. The Total Zenith Delay (TZD) will be estimated and the wet component extracted later. Integrated water Vapor (IWV) gives the total amount of water vapor that a signal from the zenith direction would encounter. Precipitable Water Vapor (PWV) is the IWV scaled by the density of water. The quality of this PWV has been verified by comparison with radiosonde data(at Osan). We processed data for JULY 2 and JULY 14, 1999 from four stations(Cheju, Kwangju, Suwon, Daegu). We found the coincidence between PWV of the estimations using GPS and PWV of pressing the radiosonde data. The average of the difference between PWV using GPS and PWV using radiosonde was 3.77 mm(Std. ＝
0.013 mm) and 2.70 mm(Std. =
0.0011 mm) at Suwon & Kwangju.