Accuracy on the Edge Detection of Topography for Digital Map Manufacture

Park, Woon-Yong,Song, Youn-Kyung,Bae, Kyung-Ho,Kim, Yong-Suk 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

Currently, digital maps in the metropolitan area are supposed to be revised and renewed every two years, but it is difficulty for the renewal of current information to keep pace with the quickly changing society and so, one of the alternative methods being discussed is a digital map produced using high resolution satellites. The biggest problem in the production of digital maps using high resolution satellite images is the difficulty of production in vector resource format through edge detection of satellite images, a Raster data. In this study, topographical boundaries were detected through edge detection of the satellite image, and after vectorliezing using the screen digitizing method, the results were evaluated and compared to the digital map from the NGII(National Geographic Information Institute) for accuracy.

Linear Combination Analysis Using GPS Data

Park, Woon-Yong,Lee, Dong-Rak,Back, Ki-Suk,Hong, Jung-Soo 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

We can process and compute the position, velocity and time by satellite signals of GPS. The signals are used to compute positioning of three dimensions and timing offset of the receiver clock when we can track the tour satellite signals at least. One of the specified aims is to use less expensive single frequency code/carrier phase GPS receivers, which are typically around half the price of dual frequency receivers. In the study, the author analyzed the accuracy and applicability of frequence linear combination using triangulation points evaluated distance limitation.

測地系의 變換에 관한 硏究

朴雲龍,洪淳憲 東亞大學校 海洋資源硏究所 1992 硏究論文集 Vol.5 No.2

한국의 측지 및 지도좌표계는 BESSEL 타원체모델에 바탕을 둔 TOKYO Datum을 채택하고 있다. 한편, 미국국방성 지도제작국(DMA)에서는 WGS72나 WGS84를 기본좌표계로 채택하여 지형정보 관련제품을 제작하고 있으며 프랑스의 SPOT lmage사에서는 WGS84와 동일한 GRS80좌표계를 사용하여 사진 및 영상을 제작하고 있다. 한국지역에 대한 SPOT위성영상과 GPS등 미국국방성 지도국이 제작한 지형정보 관련자료의 원활한 활용을 위해서는 한국지역내에서의 Local Datum,WGS72및 WGS84간의 상호변환 관계의 정립이 필요하다. 본 연구에서는 Molodensky Datum Transformation 방법을 이용하여 서로 다른 측지계 사이의 상호 변환 관계식을 정립하였다. The geodetic system and the map coordinate system in Korea are based in the local datum (Tokyo Datum). But U.S Defense Mapping Agency(DMA)produces the Digital Terrain Elevation Data (DTED) and the DIgital Feature Analysis Data(DFAD) based on world Geodetic System 1972(WGS72) or World Geodetic System 1984(WGS84). Also the SPOT satelite system and GPS(Global Positioning System) use Geodetic Refernce System 1980(GRS80) which is identical to WGC84. Therefore , the world geodetic systems are not compatible with the local geodetic system in korea. In order to solve the problem, we developed equations for the data trasformation among the local datum, WGS72 and WS84 using the Molodensky Datum Transformation Model.

염색공업단지 폐수처리장의 유입폐수 특성

박영규,이철희,양용운 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.15 No.2

요 약 문대구 D염색공단의 대표적인 염색가공업체에서 유출되는 폐수와 공단처리장에 유입되는 1 년간(1994. 1-1994. 12) 종합폐수의 수질 및 오염부하변동을 조사하였다.Polyester감량업체의 연평균 BOD 3,112㎎/ℓ , CODMn l,402㎎/ℓ이고, COD/BOD비는 0.34이 였으며, 면 T/C업체의 연평균 BOD 885㎎/ℓ, CODMn 676㎎/ℓ이고, COD/BOD비는 0.76이 였 다. (그리고 Nylon업체의 연평균 BOD 582㎎/ℓ, CODMn 376㎎/ℓ이고, COD/BOD비는 0.65 이였으며, 나염 관련업체의 COD/BOD비는 1.18이였다. )공동폐수처리장에 유입되는 유량의 78%가 50,000 ㎡/day∼60,000㎡/day이였으며, 연평균 수온은 35tC, pH는 11.6∼12.9 범위이고, 부유물질은 92㎎/ℓ 이였다. 공동폐수처리장에 유입 되는 연평균 BOD 및 COD Mn은 각각 1,824mg/ℓ, 760mg/ℓ이고, COD/BOD비는 0.42이였다. 연평균 BOD 및 CODMn 부하량은 각각 107,616kg/day, 45,O17kg/day이고, 이중 부하량 분포 에서 BOD는 80,000∼90,000kg/day 범위가 약 31 %, CODMn은 45,000∼50,000 kg/day 범위가 약 63%로 가장 많은 빈포를 차지하였다. 전체적으로 BOD 부하량는 60,000∼110,000kg/ day 분포가 약 81 %, CODMn 부하량은 40,000∼55,000 kg/day 분포가 약 92%이 였다. Abstract The wastewater discharged from several major dyeing processing industries and the mixed influent wastewater in Taegu D dyeing industrial complex were investigated for a year (1994. 1 ∼ 1994. 12) in order to evaluate the fluctuation of pollutant 1oadings.Average wastewater qualities from the polyester processing were BOD 3,112 mg/ℓ and CODMn l,042 mg/ℓ and those from the cotton T/C processing were BOD 885 mg/ℓ , CODMnMn 676 mg/ℓ and COD/BOD ratios were 0.34 and 0.76, respectively. An addition, average wastewater qualities from the pylolyester processing were BOD 3,112 mg/ℓand CODMn 736 mg/ℓ and COD/BOD Fatio was 1.18 from the printing processing,Flow rate of 78 % at dyeing industrial complex wastewater treatnlent plant was found to be on the range of 50,000㎡/day∼ 60,000㎡/day and the average mixed wastewater qualities were characterized as water tempereture 35℃, pH 12.1, suspended solid 92 mg/ℓ , BOD 1,824 mg/ℓ and CODMn 760 ㎎/ℓ.Average BOD and CODMn loadings were l07,616 kg/day,45,017 kg/day, respectively. About 31% of daily BOD loadings fell on the range of 80,000∼90,000 kg/day and about 63% COD Mn 1oadings did on the range of 45,000∼ 50,000 kg/day, which showed the most frequent range. And about 81 % of total BOD loading was found from 60,000 to 110,000 kg/day and about 92% of total CODMn loading ranged from 40,000 to 55,000 kg/day.

活性슬럿지 沈降特性 評價에 있어서 Flux理論과 操作線法의 比較

朴永圭,千命元,梁龍雲 嶺南大學校 環境問題硏究所 1989 環境硏究 Vol.8 No.2

The activated sludge characteristics orignated from the dye wastewater and the tar wastewater were estimated by the comparison of the flux theory with the operating diagram method. The surface areas of the setting tank of the dye wastewater calculated by both methods were almost equal and the similar results obtained on the tar wastewater. But it was found that the flux theory is not suitable for designing the setting tank, because the activated sludge settling characterisitics could be changed daily and the batch settling tests are time-consuming and labor-intensive. The emperical equation, Vi=V。·?? for the operating diagram proposed by G.T. Daigger and R.E. Roper, Jr was applied to the bye wastewater and the tar wastewater. The emperical parameters, V。, determined on the dye wastewater and the tar wastewater were 7.75m/h and 7.48m/h, respectively. The other emperical parameters, k, also estimated on the dye wastewater and the tar wasterwater were 0.00216(SVI) + 0.106 and 0.00157(SVI) + 0.157, respectvely. Consequently, the following relationships between SVI and sludge settling characteristics of the dye wastewater and the tar wastewater were determined ; dye wastewater ; Vi = 7.75e {-0.00216(SVI) + 0.106)?? tar wastewater ; Vi = 7.75e {-0.00157(SVI) + 0.157)??

지형공간정보체계를 이용한 상수도 관로의 종합적인 운영관리에 관한 연구

박운용,신상철,김정동 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2

The urban expansion and the modernization of the urban infrastructure need a new technology to message water service. GSIS gears an efficient management of manpower, saving of time and cost for data accumulation, by processing and managing in the form of unified data. As various types of data accumulated in relation to the construction of the infrastructure facilities, which comes out after the rapid urbanization of the areas, we need a rational GSIS to avoid the duplication and confusion of data and data system. In this study, I intend to suggest a scheme for the efficient administration of the urban infrastructure facilities, based on GSIS for the efficiency of the acquisition and utilization of data. Also, I propose a program to manage the urban-related information more efficiently and to establish a more advanced system of database, by drawing up Digital Map using standard type to set up database.

고정밀 kinematic 측량을 위한 다중 수신기를 이용한 다중경로 오차의 검출과 소거

박운용,이기부,이인수,김진수 東亞大學校 1998 東亞論叢 Vol.35 No.-

The GPS to he designed for military flight as it has released for people since 1983, has been applied to most part of engineering. Above all, it had influence on Geodesy for accurate positioning. The reason is that it makes the concept and the method of established positioning for long time to be changed. 13est merits of GPS surveying are not to be cramp from weather condition and to have speed, accuracy and economical efficiency. In addition, newly various measurement methods are developed to adjust to any condition that makes its utility to be increasing. Highly accurate measurement method as like this GPS-aided aerial triangulation, car Navigation is demanded the accuracy of a few centimeter. This paper was determinated that the multipath generated at the mobile receiver when the reference receivers were fixed, the mobile was continuously moving. After generated multipath is reduced in the data processing, it is repeatly reduced to conjunction with network adjustment and kinematic. In this method, 3D RMS is reduced to 30% in the single difference code solution. This method can be used in conjunction network adjustment as well as another method and expected more than above results.

수치사진측량기법을 이용한 문화재의 3차원 모델링에 관한 연구

박운용,김진수,백기석 東亞大學校 建設技術硏究所 2004 硏究論文集 Vol.27 No.2

Digital high resolution cameras are widely available. and are increasingly use in digital close-range photogrammetry. And photogrammetry instruments are developing rapidly and the precision is improving continuously. The building of 3D terrains of high precision are possible and the calculation of the areas or the earthwork volumes have high precision due to the development of the technique of the spatial information system using computer. Using the digital camera which has capacity of keeping numerical value by itself and easy carrying. we analyze the positioning error according to various change of photographing condition. Also we try to find a effective method of acquiring basis data for 3D monitoring of high-accuracy in pixel degree through digital close-range photogrammetry with bundle adjustment for local terrain model generation and 3D embodiment of tumulus. In the study is about to efficient analysis of digital information data for conservation of cultural properties.

국지측량에서의 RTK-GPS 정확도 분석

박운용,김천영 東亞大學校 建設技術硏究所 2001 硏究論文集 Vol.25 No.2

Real-time Kinematic GPS enables high accuracy positioning by real time. If ambiguity use an integer solution, can obtain accuracy of several "mm", and can obtain accuracy of tens "cm" if use real solution. In this study, we accomplish surveying by existent traditional surveying techniques (Total Station), Static GPS techniques and new technology RTK –GPS techniques by Field Calibration about uniformity measuring point and then compared and analyzed each techniques positioning accuracy etc ., Result that achieve by Static-GPS in Plane area, about all measuring points, expressed error fewer than 3cm. Result that achieve RTK-GPS Surveying by Field Calibration in Plane area, could know that RTK-GPS techniques by Field Calibration is available in Plane area because expressing errors fewer than all 6cm, except case that do not get fixed solution of ambiguity. RTK-GPS by Field Calibration could know economically than existent conventional type measurement and existent GPS's measurement techniques that efficiency is very high.

RTK GPS 측량에 의한 토공량 산정과 DTM생성에 관한 연구

박운용,송연경,배경호 동아대학교 건설기술연구소 2003 硏究報告 Vol.27 No.1

This paper deals with the calculation of earth volume in combination with RTK GPS and TS in the development district of residential land. It is the interpolation methods, the height , and the formula of volume calculation that the earth volume is calculated to compare with RTK and TS. As a result of comparing RTK with TS in the horizontal and vertical positions, the differences is 0.02m, 0.032m, and 0.100m at X, Y, and h. Through this results, the accuracy of RTK was confirmed, and took the average cut minus fill. The result was that TS has a lot of cut volume, and RTK has a lot of fill volume. and The cut and fill volume with RTK is much similar to that with TS, so it is applicable to the calculation of earth-volume. It is expected that RTK is applicable to a job site in no time and is the basis on the construction of DTM(Digital Terrain Model), the geometric correction of satellite imagery, and the construction of GIS database.