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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 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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The Accuracy Analysis of Methods to solve the Geodetic Inverse Problem
Lee, Yong-Chang ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 329~341
DOI : 10.7848/ksgpc.2011.29.4.329
The object of this paper is to compare the accuracy and the characteristic of various methods of solving the geodetic inverse problem for the geodesic lines which be in the standard case and special cases(antipodal, near antipodal, equatorial, and near equatorial situation) on the WGS84 reference ellipsoid. For this, the various algorithms (classical and recent solutions) to deal with the geodetic inverse problem are examined, and are programmed in order to evaluate the calculation ability of each method for the precise geodesic determination. The main factors of geodetic inverse problem, the distance and the forward azimuths between two points on the sphere(or ellipsoid) are determined by the 18 kinds of methods for the geodetic inverse solutions. After then, the results from the 17 kinds of methods in the both standard and special cases are compared with those from the Karney method as a reference. When judging these comparison, in case of the standard geodesics whose length do not exceed 100km, all of the methods show the almost same ability to Karney method. Whereas to the geodesics is longer than 4,000km, only two methods (Vincenty and Pittman) show the similar ability to the Karney method. In the cases of special geodesics, all methods except the Modified Vincenty method was not proper to solve the geodetic inverse problem through the comparison with Karney method. Therefore, it is needed to modify and compensate the algorithm of each methods by examining the various behaviors of geodesics on the special regions.
Seafloor Topographic Survey with Bedrock
Kim, Myoung-Bae ; Kwak, Kang-Yul ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 343~349
DOI : 10.7848/ksgpc.2011.29.4.343
Seabed topography and marine site survey should be performed first in the design and construction of marine structures. We could successfully acquire the seafloor topography information can be obtained by bathymetric survey and side scan sonar and the sediment layer thickness and 3D bedrock depth by seismic reflection. It is necessary to apply carry out the integrated interpretation to each other in the ocean civil Eng. In this paper, we have obtained information on the sea bottom topography and water depth at the same time using interferometer technique and on the basement depth by seismic reflection. We have performed to assess the proposed method on the seafloor topographic survey with bedrock.
Utilizing Precise Geoid Model for Conversion of Airborne LiDAR Data into Orthometric Height
Lee, Won-Choon ; We, Gwang-Jae ; Jung, Tae-Jun ; Kwon, Oh-Seob ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 351~357
DOI : 10.7848/ksgpc.2011.29.4.351
In this study, we have intended to analyze the possibility of using the precise geoid model and to find the best geoid model for working by the airborne LiDAR system. So we have calculated the geoid height from the precise geoid models (KGEOID08, EGM2008, EIGEN-CG03C) and have analyzed results by comparing the geometric geoid height from surveying and geoid heights from geoid models. As a result, the KGEOID08 that had 0.152m of RMSE was assessed the best geoid model for making DEM(DTM) by airborne LiDAR system. Also we have found the needed arrangement and numbers of reference point when the KGEOID08 was used for conversion into orthometric height of LiDAR data.
Filtering Airborne Laser Scanning Data by Utilizing Adjacency Based on Scan Line
Lee, Jeong-Ho ; Yeom, Jun-Ho ; Kim, Yong-Il ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 359~365
DOI : 10.7848/ksgpc.2011.29.4.359
This study aims at filtering ALS points into ground and non-ground effectively through labeling and window based algorithm by utilizing 2D adjacency based on scan line. Firstly, points adjacency is constructed through minimal search based on scan line. Connected component labeling algorithm is applied to classify raw ALS points into ground and non-ground by utilizing the adjacency structure. Then, some small objects are removed by morphology filtering, and isolated ground points are restored by IDW estimation. The experimental results shows that the method provides good filtering performance( about 97% accuracy) for diverse sites, and the overall processing takes less time than converting raw data into TIN or raster grid.
A Study on Continuous Management Strategy or Published Coordinates of National Geodetic Control Points using GPS Network Adjustment
Jung, Kwang-Ho ; Lee, Hung-Kyu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 367~380
DOI : 10.7848/ksgpc.2011.29.4.367
This paper has focused on deriving a GPS based geodetic network adjustment strategy to continuously determine coordinate sets of the national geodetic control points. After domestic literature review on the topic and overseas case studies about countries that recently reformed their geodetic infrastructure have been carried out, a simplified geodetic network consisting of two layers, namely GPS active and passive network, has been proposed to maximize effectiveness of the network adjustment through reducing the number of the passive points. Furthermore, a GPS data processing and network adjustment procedure has been derived to support the continuous management scheme. While a scheme for the active layer adopts a sequential least squares adjustment based on a multi-baseline, that of the passive layer employs a multi-session adjustment technique with respect to 3-dimensional baseline vectors. Finally, experimental adjustment against a network comprising 24 active and 6,900 passive stations has been performed to demonstrate the efficiency and the effectiveness of the proposed method.
Estimation of Flows and Pollutant Loads from GIS Analysis using Cell-based Geospatial and Georgraphic Information Data
Cho, Jae-Myoung ; Lee, Mi-Ran ; Yun, Hong-Sik ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 381~392
DOI : 10.7848/ksgpc.2011.29.4.381
Pollutant loads calculated with unit factor method can not identity seasonal variations of pollutant inputs. Estimation of pollutant loads considering rainfall runoff can overcome these limits. SCS curve number method was applied to estimate runoff of each event of Koeup watershed of Koheung estuary lake. SCS curve numbers were calculated based upon land use, soil types of the catchment using GIS. Point and nonpoint source pollutant loads were summed up for total loads estimation. Those from nonpoint source were estimated by multiplying the calculated runoff and expected mean concentrations (EMC) presented by the Minister of Environment of Korea. DEM can present three dimensional views of a terrain, identity stream networks and flow accumulation. Furthermore, it can examine accumulated pollutant loads of specific point of a catchment. Therefore, cell based pollutant load estimation was attempted using DEM. ArcView was utilized to collect, store and manipulate spatial and attribute data of pollutant sources and features of the catchment. Cell-based DEM which was established by the GRID module of ARC/INFO was employed to estimate flows and pollutant loads.
Redefinition of the Original Benchmark Height using Long-term Tide Observations Analysis and GPS Levelling Methods
Jung, Tae-Jun ; Yoon, Hong-Sic ; Hwang, Jin-Sang ; Lee, Dong-Ha ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 393~403
DOI : 10.7848/ksgpc.2011.29.4.393
In this study, we suggested the period of tide observations is proper to calculate the mean sea level(MSL) precisely on Incheon tide station using wavelet analysis, and newly determined then the vertical reference surface of Korea using the calculated MSL. In order to calculate the height difference between the calculated MSL and specific ground station (ICGP) near the Incheon tide stations, we performed the laser measurements directly to the sea surface where located below ICGP. The orthometric-height of ICGP was determined that corrected the height difference to the calculated MSL using linear interpolation method. Finally, we connected the orthometric-height of ICGP with the original benchmark (ORBM) using GPS leveling methods for determining the new orthometric-height of ORBM. As the results, there is a variation amount of 0.026m between the new MSL was calculated in this study and old MSL was calculated in 1910's. Also, there is a difference of 0.035m between the new and old orthometric-heights of ORBM. The connection (or leveling) error of 0.009m was revealed in new orthometric height of ORBM with consideration of MSL variation which may caused by the error of GPS ellipsoid height and/or geoid model. In this study, we could be determined precisely the orthometric-height of ORBM based on the new MSL of Incheon Bay using only GPS leveling method, not a spirit leveling method. Therefore, it is necessary to determine the vertical datum strictly using long-term and continuously tide observations more than 19 years and to use the GPS leveling method widely in the height leveling work for the effective changeover from the orthonormal to the orthometric in national height system.
A Comparative Analysis of Field Surveying Vegetation Data and NDVI from KOMPSAT-2 Satellite Imagery
Kim, Gi-Hong ; Lee, Jong-Seol ; Jung, Jae-Hak ; Won, Sang-Yeon ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 405~411
DOI : 10.7848/ksgpc.2011.29.4.405
In this study we tried to compare and analyze KOMPSAT-2 NOVI and vegetation coverage(VC) which is investigated by fieldwork. To standardize KOMPSAT-2 NOVI, we adjusted NOVI using reference data which is atmospheric corrected MODIS NDVI. Each vegetation coverage point data was surveyed in field using portable GPS and compared with NDVI of satellite imagery. As a results, there was high level of correlation in vegetation coverage and NOVI.
Extraction of Landmarks for Pedestrian Navigation System
Rho, Gon-Il ; Kim, Ji-Young ; Yu, Ki-Yun ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 413~420
DOI : 10.7848/ksgpc.2011.29.4.413
This study is to extract landmark buildings for pedestrian navigation from the existing spatial data sets automatically. At first, we defined candidates for landmark based on sight of pedestrian, then extracted final landmark by evaluating attributes of each candidate. The attribute is evaluated with relative or absolute criteria depending on the nature of each attribute. Landmarks extracted through the proposed method are compared to existing landmarks for vehicle and assessment of the validity and the applicability is performed. As a result, extracted Landmarks are expected to help guiding pedestrian effectively.
A Study on the Classification of Geospatial Industry based on the Korea Standard Industry Classification
Ahn, Jae-Seong ; Kim, Hyung-Tae ; Heo, Min ; Lee, Byoung-Kil ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 421~428
DOI : 10.7848/ksgpc.2011.29.4.421
It is challenging to survey the size and economical value of geospatial industry, because of the vagueness of the industry range. This study suggested a proposed method for the classification of geospatial industry based on Korea Standard Industry Classification, Th proposed method for the classification considered the value added chain of geospatial industry and Korean Standard Industry Classification, Theses considerations reflected characteristics of geospatial industry, Industrial statistics of geospatial industry are expected to be surveyed based on the classification proposed by this study,
Land cover classification using LiDAR intensity data and neural network
Minh, Nguyen Quang ; Hien, La Phu ;
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, volume 29, issue 4, 2011, Pages 429~438
DOI : 10.7848/ksgpc.2011.29.4.429
LiDAR technology is a combination of laser ranging, satellite positioning technology and digital image technology for study and determination with high accuracy of the true earth surface features in 3 D. Laser scanning data is typically a points cloud on the ground, including coordinates, altitude and intensity of laser from the object on the ground to the sensor (Wehr & Lohr, 1999). Data from laser scanning can produce products such as digital elevation model (DEM), digital surface model (DSM) and the intensity data. In Vietnam, the LiDAR technology has been applied since 2005. However, the application of LiDAR in Vietnam is mostly for topological mapping and DEM establishment using point cloud 3D coordinate. In this study, another application of LiDAR data are present. The study use the intensity image combine with some other data sets (elevation data, Panchromatic image, RGB image) in Bacgiang City to perform land cover classification using neural network method. The results show that it is possible to obtain land cover classes from LiDAR data. However, the highest accurate classification can be obtained using LiDAR data with other data set and the neural network classification is more appropriate approach to conventional method such as maximum likelyhood classification.