• Journal of Korean Society of Forest Science
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• v.79 no.4
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• pp.388-397
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• 1990

This study was conducted to investigate the changes of land use and stand volume around Mt. Kuem-O by B/W aerial photographs in 1979 and B/W Infrared aerial photographs in 1988. The results obtained in this study were as follow : 1. In classification of forest type on aerial photographs, coniferous stand was dark tone and hardwood stand was light tone and irregularly rounded crowns. 2. In classification of coniferous stand, Pinus densiflora was narraw cone and rounded tip of crowns and rough texture, Pinus rigida was irregulary rounded and broadly conical crowns. 3. To refer to changes of forest land area, mixed forest was changed into P. desiflora (687ha), P. rigida (130ha) and hardwood stand (219ha). 4. The regression equations between crown diameter and DBH were significant at 1% level by F-test in all stands. So the equation, D=a+bCD was used to estimate DBH. 5. The tree height curve equations were significant at 1% level by F-test in all stands. To estimate tree height the equation, logH=loga+blogD was adopted in P. densiflora and L. leptolepis and $H=a-bD+cD^2$ was adopted in P. rigida, hardwood stand and mixed forest. 6. The highest volume per hectare was observed in L. leptolepis and mixed forest showed the greatest growth percentage, while the lowest volume per hectare and growth percentage were observed in hardwood stand.

• Journal of the Optical Society of Korea
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• v.20 no.3
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• pp.413-426
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• 2016

There has been much advancement in the field of aerial cameras for geographical features with the help of drones, image processing power and computer aided optical programs. In this study, we propose a new optical lens design technique which minimizes the amount of ‘the third order Seidel aberration’ for enhancing MTF. In addition, we suggest a new optical lens design which stabilizes the mass-production yield through R.S.M and has robustness secure through the Taguchi method. Eventually, the image processing algorithm of stereo matching is implemented in order to evaluate whether the proposed lens design result meets adequate specifications for the use of dual aerial photographs or not. This paper provides good guidance for the optical design by development of experiments.

• Journal of Korea Water Resources Association
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• v.53 no.6
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• pp.463-467
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• 2020

The main feature of this study is to automatically synthesize square images by sending aerial photographs and images from unmanned aerial vehicles (drons). It may be applicable to the cloud server, and to apply analytical algorithms for the suitable purpose of image processing. Drone imaging analysis is a process that can be used in various fields such as finding contaminated area of green algae, monitoring forest fire, and managing crop cultivation.

• The Korean Journal of Ecology
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• v.21 no.6
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• pp.791-797
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• 1998

An attempt to clarify the landscape structure of urban areas was carried out on Mt. Hwangryung located in the center of Pusan, southern Korea. By means of aerial photographs and field survey, a vegetation map including land-use pattern was made. Landscape structure was described by analyzing the vegetation map. Landscape element types were classified into secondary forest, introduced plantation, and other elements including urbanized area. almus firma and Pinus thunbergii communities, introduced plantation elements, formed matrix and some secondary forest elements and the other artificial plantations of small scale tended to distribute as small patches in such matrix. The number of patches per unit area in secondary forest elements was more than that in introduced plantation element. The result on patech size was vice versa. As the results of landscape ecological analyses, it was estimated that differentiation of patches recognized in community level would be related to artificial interference and those in sub-communities levels to natural process such as progression of succession. On the other hand, restoration plans in viewpoints of restoration and landscape ecology were suggested to improve ecological quality of Mt. hwangryung.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2004.11a
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• pp.137-142
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• 2004

There has been considerable controversy over the change of coastal topography and shoreline by coastal erosion in Gohyun Bay, Geojedo. In this study, we analyzed aerial photographs and surveyed coastal topography and shoreline. Changes between years were identified using a GIS overlay analysis and field surveys with DGPS, Total Station and Echo Sounder. As a result, we were able to identify changes by coastal erosion in the area of Gohyun Bay, Geojedo.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.441-443
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• 2003

The Bamboo stands, which had been planted for agricultural uses, have been spreading from fields to hills and mountains beyond farmers’ expectation over the last 50 years. Bamboo stands yield bamboo shoots to be served as a vegetable dish (‘takenoko in Japanese’) every spring, and supply materials for bamboo crafts in various ways. Now, as bamboo products have lost their social demand, bamboo stands has been gradually abandoned. This has resulted in the wild and unfavorable spread of bamboo stands in many regions over the western half of Japan. This paper illustrates the unfavorable spread of bamboo stands regionally in the southern Kyoto from 1985 to 1999 and the Yamashiro area from 1948 to 2000 through the observation of satellite images and aerial photographs.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.100-102
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• 2003

This system is capable of obtaining quantitative information from images using natural features on the ortho-image maps that correspond with those from topographical maps. However, the qualitative information can also be obtained because because of the excellent visibility of ortho-image maps. There are plenty of promise for the use of ortho-image maps in the next generation topographic technology because of its wider applicability within the field. In keeping with the cutting edge, we produced ortho-image maps by scanning a specified area in narrow sections using the PKNU 2: a multispectral digital aerial photographing system made by ourselves. We evaluated the precision of the ortho-image maps, and performed an evaluation of the PKNU 2 system's capacity to improve the equipment of the PKNU 2. Ortho-image maps were made using Ground Control Points (GCPs) which were obtained from digital maps and aerial photographs of the PKNU 2. Thus, we demonstrated that it was possible to produce the ortho-image maps, which has a good constant level rate of less than 1m. The PKNU 2 system needs to be improving in the sensitivity of level maintenance equipment in the evaluation in terms of performance. It is thus required to survey the GCPs precisely for an accurate study.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.295-299
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• 2010

The vertical photographs of the existing production role of aerial photogrammetry was sufficient for the purpose. The current variety of purposes, such as image maps are used. However, a 3-D stereoscopic mapping, three-dimensional modeling and obtaining the side information of objects are difficult with limitations. In this study, aerial polyhedral oblique imagery are used for obtaining the a vertical and the side information of buildings at the same time to get used to the urban information. The results of this study, various urban information was available, the existing vertical photos can overcome the limitations of the techniques.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.25-27
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• 2004

Han River water landscape changes between 1966 and 2002 were detected by interpreting IKONOS images, aerial photographs. Digital photogrammetry technique was used in this process. Most of water landscape change are disappearance of sandbars and meandering streams in 1966. It is mainly due to the stream straightening for housing site development.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.2010-2014
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• 2008

본 연구에서는 구하도 및 폐천 형성에 따른 시 공간적 하도 지형 변화를 정량적으로 파악하 기 위해 과거와 현재의 항공사진을 분석하였다. 항공사진은 청미천을 대상으로 하여 단기간의 인위적인 하천정비사업으로 인해 형성된 구하도의 형태 및 규모를 우선적으로 검토하였다. 그리고 하천의 종단 길이변화, 미지형 변화 등을 정량적으로 분석함으로서 인위적인 직강화 영향 후 하도 형태 변화를 예측할 수 있는 주요 요소들을 파악하였다.