• Journal of Korea Spatial Information System Society
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• v.1 no.2 s.2
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• pp.115-125
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• 1999

Much efforts are being process at many ways for digitization cadastral maps that will be the base map of Parceled Based Land Information Systems. But, current digitizing systems need too much time and cost digitizing about 720,000 cadastral maps. That's way we develop new digitization system for cadastral maps by using scanning and vectorizing methods. In this paper, we treat scanner test and vectorizing program that are the most important parts of new digitization system for cadastral maps. we analyze needs of Korean Cadastral Survey Corporation, and discuss algorithms and functions of developed programs. Using newly developed scanner test program, user could test various scanners, and use inexpensive scanner if it satisfy the accuracy needed. And vectorizing program will reduce much time and cost, because it is designed and customized practically to he adequate to cadastral maps and to improve work speed, accuracy and usage.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.9 no.4
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• pp.113-124
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• 1989

In this study, we tried to extract the land-use change information of Seoul city using the multiple date images of the same geographic area. Multiple date image set is MSS('72, '79, '81, '93) and TM('85), and we carried out geometric correction, digitizing(due to the administrative boundary) in pre-processing process. In addition, we performed land-use classification with MLC(Maximum Likelihood Classifier) after improving the predictive accuracy of classification by filtering technique. At the stage of classification, ground truth data, topographic maps, aerial photographs were used to select the training field and statistical data of that time were compared with the classification result to prove the accuracy. As a result, urban area in Seoul has been increased('72 : 25.8 %${\rightarrow}$'81 : 43.0 %${\rightarrow}$'85 : 51.9 %) and Forest area decreased ('72 : 39.0 %${\rightarrow}$'85 : 28.4 %) as we estimated. Finally, it is concluded that the utilzation of satellite imagery is very effective, economical and helpful in the urban land-use/land-cover monitoring.

• Proceedings of the KSRS Conference
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• 2009.03a
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• pp.31-34
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• 2009

본 연구에서는 KOMPSAT-3급 고해상도 위성영상을 이용하여 전처리 후 정밀 농업 주제정보를 추출하는 방법론을 제시하고자 하였다. 분석에 사용한 KOMPSAT-3급 고해상도 위성영상은 IKONOS (2001/5/25, 2001/12/25, 2003/10/23) 3개의 영상, QuickBird (2006/5/1, 2004/11/17) 2개의 영상, KOMPSAT-2 (2007/9/17) 1개의 영상 등 모두 6개의 영상을 확보 및 각각에 대한 현장 GCP자료 및 RPC, RPB 자료를 수집하여 정사보정을 실시하였다. RMSE는 약 $0.12\sim3.18$의 값으로 분포되었다. KOMPSAT근 급 영상자료로 부터 정밀농업물재배지도를 작성하기 위해 각 벤드별 Scatter기법을 이용하여 각 밴드간의 상간관계를 살펴보고, 3개의 최적의 밴드를 선정하였다. 또한 작물별 최적의 밴드 결정을 위해 각 밴드별 픽셀 값을 사용하여 Texture 분석을 실시하였다. 그 결과 논의 경우 모든 밴드에서 분석이 용이 한 것으로 분석되었으며, 4밴드의 경우 3개의 작물(고추, 옥수수, 벼)의 분석시 매우 적합한 밴드인 것으로 분석되었다. 각 영상별 필터링 기법과, ISODATA 방법을 이용한 정밀농업 토지이용도 작성하여 기존 스크린 디지타이징 기법으로 작성한 정밀토지이용도와 비교하였다. 다양한 식생정보를 추출하는 위하여 확보된 영상자료로부터 RVI, NDVI, ARVI, SAVI 식생지수 를 추출하였으며, 그 결과를 현장자료로부터 추출한 식생지수간의 결과 값과 비교분석하였다.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.2
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• pp.61-69
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• 2009

In mid-July, 2006 the torrential rainfall across Gangwon-do region caused 48 casualties and 1,248 houses submerged, resulting in damages with the restoration costs of 3 trillion and 512.5 billion won. This was because the topographic characteristics of Gangwon-do region for which mountainous areas mostly account increased the effects of landslide. In this study, the landslide region was shot using the PKNU No.4 system immediately after the occurrence of landslide in order to analyze it as objectively, exactly, and rapidly as possible. 1,054 areas with landslide occurrence were extracted by digitizing the shot images through visual reading after orthometric correction using ERDAS 9.1. Using the Arc GIS 9.2, a GIS program, hydrologic, topographic, clinical, geologic, pedologic aspects and characteristics of the landslide region were established in database through overlay analysis of digital map, vegetation map, geologic map, and soil map, and the status and characteristics of the occurrence of the landslide were analyzed.

• Journal of Korean Society of Rural Planning
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• v.9 no.1 s.18
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• pp.85-93
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• 2003

Many features of the Single Field version have been enhanced to provide user friendly interface. The County/Watershed version of NAPRA WWW system was further enhanced. The newly developed Web GIS version is an ideal tool for novice users, such as farmers, to simulate the effects of agricultural management for their farms because of its easy-to-use Web GIS interface. The NAPRA WWW system provides an easy to use WWW interface and uses spatial and relational databases to simplify the process of preparing model files. Thus, the NAPRA WWW systems now can be effectively used for nutrient management as well as pesticide management to identify the least impact agricultural management practices.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.6
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• pp.687-695
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• 2011

Many internet portals provide maps with spatial information services. Recently, various images including aerial, satellite, street view, and photo-realistic 3D city models are provided as well as maps. This study suggested a method for geometric correction of the panoramic aerial images in the internet portal and 3D building modeling using information which is available in the internet. The key of this study is to obtain all necessary data easily from internet without restrictions. Practically, the ground control coordinates could be available from geo-referenced internet maps, and stereo pairs of the aerial images and close-range photographs for photo-realistic object modeling are provided by the internet service. However, the ground control points are not suitable for accurate mapping. RMSE of the plotting was about 9 meters and reduced upto 4 meters after coordinate transformation. The proposed methods would be applicable to various applications of photo-realistic object modeling which do not require high accuracy.

• Spatial Information Research
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• v.20 no.3
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• pp.57-66
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• 2012

Gangwon-do has been suffering extensive landslide dam age, because its geography consists mainly of mountains. Analyzing the related factors is crucial for landslide prediction. We digitized the landslide and non-landslide spots on an aerial photo obtained right after a disaster in Inje, Gangwon-do. Three landslide factors-topographic, forest type, and soil factors-w ere statistically analyzed through GIS overlap analysis between topographic map, forest type map, and soil map. The analysis showed that landslides occurred mainly between the inclination of $20^{\circ}$ and $35^{\circ}$, and needleleaf tree area is more vulnerable to a landslide. About soil properties, an area with shallow effective soil depth and parent material of acidic rock has a greater chance of landslide.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.20 no.3
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• pp.313-321
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• 2002

Supplying high-resolution satellite image, we take much interest in the update and the revision of digital map and thematic map based on the satellite image. This study presented the possibility of the update and the revision to the existing digital map on a scale of l/5,000 and 1/25,000 to take advantage of the IKONOS satellite image. We performed geometric correction to make use of the ground control points of the existing digital map in IKONOS mono-image and created ortho-image by extracting digital elevation model from three dimensional contour data and altitude on the existing digital map. We revised changed features in the method of screen digitizing by overlapping orthorectified satellite image and existing digital map and flawed features of the unchanged area on the satellite images for positional accuracy analysis. As a result, rectification error is calculated at $\pm$3.35m by RMSE. There is a good possibility of update of digital map under the scale of 1/10,000. It is possible to the update of the large scale digital map over the scale of l/5,000, as if we used the method of stereo image and ground control point surveying.

• Journal of the Korean Association of Geographic Information Studies
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• v.22 no.1
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• pp.114-128
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• 2019

This study is a spatial analysis of the boundaries related to the division of the Korean peninsula. The boundary space was extracted by extracting $38^{th}$ parallel and digitizing the map of the Armistice Agreement Annex. The purpose of this analysis was to extract more accurate scope based on the armistice agreement, the appendices, and the UNC regulations and to analyze the wrong information correctly. The range of demilitarized zones was determined by UNC 551-4(2014) and UNC 551-5(2015) to ensure that there is no change in the location of the Southern Limit Line. It also confirmed that the MACHA was excluded in the DMZ. As a result, the area of the DMZ was measured at $889.7km^2$. Also this study identified the interval and number of markers in the MDL and the Han River estuary. It could be confirmed that the interval of markers within the MDL depends on the subject of management. This study is more accurate from the start and can be used as basic data needed in the study and education of DMZ and border areas after verification by public organizations.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.407-407
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• 2011

강원도의 경우 대부분의 지형이 산지로 이루어져 있으며 2002년, 2003년과 2006년에 대규모 태풍 및 집중호우에 의해 많은 재산피해와 인명피해를 입었다. 특히 인제지역은 2006년 7월 태풍에 위니아와 빌리스로 인해 많은 산사태와 토사재해가 발생하였다. 피해원인을 분석해 보면 집중호우에 의해 산지 지역에 위치한 소하천으로 많은 양의 토사와 암설류등의 유입으로 인해 피해가 가중되었으며 이러한 토사재해의 특성과 요인을 분석하기 위해 최근 GIS 및 원격탐사를 이용하여 많은 연구들이 진행되고 있다. 본 연구에서는 토석류 발생유역의 특성을 조사하기 위하여 토석류 발생 전후 영상을 토대로 재해 발생지역을 추출하여 디지타이징하고, GIS를 이용하여 토석류 발생지역의 DEM 생성 및 대상 유역을 추출하고 공간자료를 수집하여 토석류 발생영역별 수문학적, 지형학적 분석을 실시하였다. 그 결과를 토대로 토석류 발생유역을 발생부, 유하부, 퇴적부로 분류하고 구간별 경사 분포와 토석류 및 산사태 발생지점과 하천의 거리, 면적 등을 고려한 상관관계 분석결과 유역의 경사와 하천과의 거리가 높은 상관성을 나타내었다.