• Journal of Environmental Impact Assessment
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• v.6 no.1
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• pp.47-54
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• 1997

Vegetation Index(VI) derived from remote sensing data is used to assess ecosystem factor in Environmental Impact Assessment(EIA) process. Ecosystem factor has been prepared by Degree of Green Naturality(DGN) mainly in Environmental Impact Statements. But DGN has room for improvement of assessing actual ecosystem situation. The objectives of this study are to define the relationship between field measure DGN and VI, and to develop methodologies to use VI for assessing the status and conditions of natural ecosystem. For verification of DGN and VI, 35 sites using global positioning system are selected and reviewed. Correlation coefficients of DGN and VI shows highly as 0.69. Also VI in EIA found it can be applied to assess ecosystem. It concluded that VI as well as DGN can be applied to assess ecosystem newly and largescale.

• Journal of Korean Society of Forest Science
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• v.64 no.1
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• pp.64-73
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• 1984

As data basic to policy in nature conservation, the Degree of Green Naturality (DGN) survey was usually carried out. This also explains the impact of human interference to natural environment. Gongju gun and Yeongi gun were surveyed in the summer of 1983 to determine the DGN of these districts. Then, the surveyed DGN was compared to the existing standard. The results obtained appeared that the average DGN of these districts ranged about 5.1 to 5.9 and especially the ratio of DGN 7-graded area was high. Because of difficulties in applying the existing standard directly to middle part of Korea, further improvement on the existing standard for ranking or surveying the DGN should be reconsidered.

• Journal of Environmental Impact Assessment
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• v.6 no.2
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• pp.181-188
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• 1997

Vegetation is an important factor in EIA(Environmental Impact Assessment) and it is assessed according to DGN(Degree of Green Naturality) in EIS(Environmental Impact Statement) preparation. But DGN has room for improvement of assessing vegetation Status. This study introduced NDVI(Normalized Difference Vegetation Index) for improving status assessment method that subjects to DGN. For the application of NDVI, Landsat TM data of Chunchon on May 2, 1989 and June 1, 1994, and data of Ulsan on November 5, 1984, November 2, 1992 and May 9, 1994 were used. It compared NDVI with DGN according to season and location. The correlation coefficient value for the spring image (1994, 0.7, p=0.01) was proved to be higher than that of autumn (1984, 0.5, p=0.01).

• Journal of Environmental Impact Assessment
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• v.11 no.3
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• pp.129-143
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• 2002

This study was executed environmental assessment to determine whether or not the national landuse planning change on the reserved area for a rope way in the ice valley(Eoreurngol) of Miryang. The selected survery area is $1,633,442m^2$ and assessed with flora, actual vegetation, degree of green naturality(DGN), sere stage and wild birds. The flora was summarized as 132 taxa which is 90 genera, 117 species, 12 varieties and 3 forms. The actual vegetation was classified 24 types and nature forests like Quercus and deciduous-broad leaf community was distrubuted broadly. Especially Quercus and deciduous-broadleaf communities were assessed high rarity value in Miryang. From the analysis of DGN, it were found out that DGN 8 is 72.5% and DGN 9 is 3.9%. At the analysis of sere stage, the communities were divided 4 with Quercus mongolica, Pinus densiflora, Carpinus laxiflora and deciduous-broadleaf community. Wildbirds was observated as 30 species and 161 ea and Aix galericulata (natural monument no. 327) especially inhabited there. From the above nature ecosystem assessment, the survey area has high quality naturalness, so it was turned out that a rope way construction might be not suitable in survery area.

• Journal of Environmental Impact Assessment
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• v.8 no.3
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• pp.77-90
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• 1999

The degree of green naturality (DGN) has played a key role for maintaining the environmental quality from inappropriate developments, although the quality and effectiveness of the mapping of DGN has been under debate. In this study, spatial distribution of degree of green naturality was initially estimated from forest stand maps that were produced from the aerial photo interpretation and extensive field survey. Once the boundary of initial classes of DGN were defined, it were overlaid with normalized difference vegetation index (NDVI) data that were derived from the recently obtained Landsat Thematic Mapper data. NDVI was calculated for each pixel from the radiometrically corrected satellite image. There were no significant differences in mean values of vegetation index among the initial DGN classes. However, the satellite derived vegetation index was very effective to delineate the developed and damaged forest lands and to adjust the initial value of DGN according to the distribution of NDVI within each class.

• Korean Journal of Environment and Ecology
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• v.18 no.2
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• pp.167-174
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• 2004

This study was carried out to investigate the actual vegetation and the DGN(Degree of Green Naturality) from Namdeogyusan of the Deogyusan National Park to Sosagogae in the Baekdudaegan in 2003. The actual vegetation of the surveyed site were classified into 14 plant communities and cropland, etc.; Natural forest were classified into 9 plant communities; Quercus mongolica communities, mixed forest, deciduous broadleaf plant communities, Pinus densiflora communities, etc. And afforested lands were classified into 4 forest types; Larix leptolepis communities, Pinus rigida communities, etc. The DGN 9 was appeared the widest area as 57.97% and the DGN 8 was 26.80%. The DGN 1 and 2 were appeared as 5.18% at Sosagogae and Paejae district in outside of the Deogyusan National Park.

• Aerospace Engineering and Technology
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• v.10 no.2
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• pp.1-10
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• 2011

This is a comparative study of three inertia navigation units and focuses on the verification of reliability about GPS/INS for the SmartUAV(DGNS). Those GPS/INS have been tested using a manned aircraft and an automobile. The comparative aspect of units include details about the GPS positions and the inertia sensor performance. With the flight scenario, the DGNS guarantees the reliability of the navigation operation and performs the flight test for the development of the SmartUAV.

• Korean Journal of Environment and Ecology
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• v.17 no.2
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• pp.153-168
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• 2003

Wangpicheon, which is located in Uljin-Gun, Korea, is threatened with various developments plan recently. To investigate the forest structure, actual vegetation and degree of green naturality(DGN) in Wangpicheon, survey was carried out within about 1km width from the stream. In the analysis of actual vegetation, the forest type around Wangpicheon is differentiated into 26 vegetation ones. In these, six Pinus densiflora - dominated vegetation types are appeared a great many of them. In DGN analysis, 70.8% of total area is covered by DGN 8 and 0.3% of total area is covered by DGN 9. According to the analysis of classification by TWINSPAN, the community was divided by three types of Pinus densiflora community and two types of Quercus spp. community i.e. Quercus mongolica and Q. vuliabitis community. The structure of communities were analyzed using importance percentage, and species and individuals, DBH distribution and similarity analysis were executed.

• Korean Journal of Environment and Ecology
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• v.15 no.1
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• pp.39-56
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• 2001

본 연구는 국토의 친환경적 개발을 위한 제도적 장치 중 하나인 환경성검토의 강화방안을 마련하고자 경기도 남양주시 오남면 팔현리 일대의 골프장개발예정자를 대상으로 한 환경성검토서를 분석하였으며, 또한 대상지의 정확한 평가를 위해 현존식생도, 녹지자연도, 군집의 발달기원, 천이단계, 군집의 희소성, 식물의 희소성 판단의 6개 항목을 선정, 적용한 결과 본 대상지는 개발계획읜 축소. 조정항목으로 판단되었다. 친환경적인 개발을 위한 환경성검토 강화방안을 계획적인 측면에서는 적정대상지의 선정과 이식수목의 산정을 제도적인 측면에서 표토보존 및 이용에 관한 법률과 자연훼손보상제도를 제안하였다. 추가조상대상지역(면적: 1.436, DGN 7이 254, 587$\m^2$. DGN7(8)이 207,235$\m^2$ DGN 5가 163,259$\m^2$, DGN 2는 184,129$\m^2$로 나타나 대상지와 추가조사지역 일부를 포함한 적정대상지를 선정하였다. 이식수종은 성상별로 소나무 1종, 낙엽활엽교목 19종, 낙엽활엽아교목 11종, 낙엽관목 30종, 만경목 11종이었고, 이식가능면적은 639,310$\m^2$이었으나, 보존지역을 제외한 실제 이식가능한 지역은 275, 366$\m^2$으로 나타났다. 대상지의 내 이용가능한 표토량은 137.681㎥이었으며, 보존지역 중 불가피한 훼손면적은 43,938$\m^2$로 나타나 이에 상응하는 가치의 습지나 소생물권 등을 조성하여야 할 것이다.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2007.04a
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• pp.341-344
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• 2007

National Geospatial-Intelligence Agency(NGA) developed VPF in mid 1980 to digitalize military geospatial information. However, because VPF is very complicated system and was severly inefficient in producing, maintaining, and managing the data, VPF was required to be replaced by more efficient data format. These requests resulted in an integrated schema, and eventually VPF. The main idea of using FDB in the production of digital map of non-accessible area is to increase the accuracy. This research focuses on the production of high accuracy digital map by utilizing the FDB. The accuracy of digital map by FDB and by DGN was individually compared with 1m CIB imagery of the Korean peninsula. By analyzing 38 check points based on CIB, DGN showed RMSE of 52m X axis and 49m Y axis. FDB showed 15m in X axis and 13m in Y axis. These results show that the digital map produced using FDB has much higher accuracy than DGN based digital map.