• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2009년도 춘계학술대회 논문집
• /
• pp.22-25
• /
• 2009

본 논문은 기 구축된 환경부의 중분류 토지피복도를 올해 KOMPSAT-2 화상으로 갱신하기 위한 예비연구에서 분류결과의 정확도 평가를 중점적으로 나타낸다. KOMPSAT-2 화상기반의 중분류 토지피복도는 객체지향의 분류기법을 이용하였고, 경계선 수정의 경우 반자동 기법에 의해 제작되었다. 계통표집과 임의표집에 의한 Kappa 분석에서 계통 표집의 KHAT값은 0.81, 임의표집의 KHAT값은 0.89를 각각 가지므로 거의 완벽의 일치성을 표시한다. 따라서 전술한 지도화 방법을 통해 제작된 KOMPSAT-2 화상의 중분류 토지피복도는 이용자에게 토지피복정보의 신뢰성도 함께 제공한다.

• 한국농공학회논문집
• /
• 제51권4호
• /
• pp.37-42
• /
• 2009

This study extracted Near Infrared (NIR) band using Image Processing Technology (IPT), and calculated Normalized Difference Vegetation Index (NDVI). Aerial photography from Daum portal in combination with high resolution satellite image was employed to improve vegetation sensitivity by extracting NIR band and calculating NDVI with comparison to QuickBird result. The extracted NIR band and NDVI through IPT presented similar distribution pattern. In addition, a regression analysis by land cover character showed high correlation paddy and forest Therefore, this approach could be acceptable to acquire vegetation environment information.

• Spatial Information Research
• /
• 제10권4호
• /
• pp.533-550
• /
• 2002

Soil organic matter (SOM) content and other physical soil properties were extracted from a digital soil database, the Soil Survey Geographic (SSURGO) database, to map the amount of SOM and determine its relationship with topographic positions in floodplain areas along a river basin in Douglas County, Kansas. In the floodplains, results showed that slope and SOM content had a significant negative relationship. Soils near river channels were deep and nearly level, and they had the greatest SOM content in the floodplain areas. For the whole county, SOM content was influenced primarily by soil depth and percent SOM by weight. Among different slope areas, soils on mid-range slopes (10-15%) and ridgetops had the highest SOM content because they had relatively high percent SOM content by weight and very deep soils, respectively. SOM content was also significantly variable among different land cover types. Forest/woodland had significantly higher SOM content than others, followed by cropland, grassland, and urban areas.

• 한국환경과학회지
• /
• 제2권2호
• /
• pp.115-121
• /
• 1993

At the close of the year 1990, tombs in south Korea will cover the area of 940 km2, which is 0.9% of the entire landspace. Annual increase of 200,000 tombs is encroaching on landspace by 10 $km^2$. It4 is estimated that the decrease in the forest area caused by tombs results a decrease both in the production of $0_2$ by 912,000 tons and in the absorption of $CO_2$ by 1,2454,800tons per year. As a result, there will be an increase in the amount of $CO_2$, which is one of the factors that cause the greenhouse effect.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
• /
• pp.702-707
• /
• 2002

Three periods of land-use maps of the Suomo Basin were drawn from topographic maps (1970a) and Landsat TM/ETM images (1986a and 1999a). The area of each kind of land use was calculated from the three maps. From 1970 to 1999, the area of forestland decreased 17%, the area of sparse forestland increased 8%, and the area of grassland increased 10%. The transferring trend of the land-use is that forestland turned into sparse forestland and brush land, and the brush land degenerated into grassland based on the transferring matrixes from 1970 to 1986, and from 1986 to 1999. According to the local government record and statistical data, forest cover rate had been increasing from 1970 to 1998, but the amount of growing stock had been declining. From 1957 to 1998, the amount of growing stock declined from 423m$^3$/ha to 177m$^3$/ha.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
• /
• pp.1134-1136
• /
• 2003

In this research, GIS based evaluation methods were applied to habitats of Japanese black bear (Ursus thibetanus japonicus Schlegel) in northern Honshu. The study area was divided into 828 small watershed units , and five GIS indexes, Vegetation Type（V.T.）, Extent of Forest Cover (E.F.C.) Slope Incline (S.I), Average Altitude (A.A.) and Road Density(R.D.), were used to evaluate each watershed unit in terms of suitability as black bear habitat. In addition, Interspersion and Juxtaposition spatial indices were calculated for each watershed unit. The results clearly identified the regions with the most suitable habitats, indicating that this methodology is suitable for application to various environmental planning efforts, such as regional development master plans, project-specific environmental impact assessments, species management plans and biodiversity conservation plans.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
• /
• pp.257-259
• /
• 2003

Landuse maps are prepared from satellite imagery and field observations were conducted at various locations in the study area. Compared to the field data and NDVI and RVI thematic maps, NDVI is better than RVI, because it compensates for changing illumination conditions, surface slope, aspect and other factors. Clouds, water and snow have negative values for RVI and NDVI. Rock and bare soils have similar reflectance in both NIR and visible band, so RVI and NDVI are near zero. In forest areas with good vegetation cover, NDVI is high and landslide occurrence is less. But if annual and biennial vegetations are present and if cultivation practices are changed frequently, NDVI is medium and landslide occurrence is moderate. In areas where deforestation and settlement is in progress, NDVI is less and landslide occurrence is more. The NDVI FCC thematic map may be used as an important layer in GIS application for landslide studies. Analyzing other layers such as slope, rainfall, soil, geology, drainage, lineament, etc with NDVI FCC layer will give a better idea about the identity of landslide prone areas.

• 한국물환경학회지
• /
• 제29권6호
• /
• pp.739-745
• /
• 2013

This paper investigated the runoff characteristics of different properties of suspended solids in streams according to the watershed characteristics and dry/rainy season. Suspended solids were divided into VSS and NVSS depending on volatilization. The main results of this study were as follows. TSS were more correlated with NVSS than VSS. Suspended solids were positively related with the proportion of urban > paddy > upland, negatively related with forest cover. VSS were positively correlated with POP and POC. VSS, measured in dry season, would partly result from autochthonous production and could be an indirect indicator of organic suspended solids.

• 한국지형학회지
• /
• 제27권4호
• /
• pp.1-11
• /
• 2020

Coastal dunes play an important role in coastal defense. The Moraeul dune in Daecheongdo Island is representative in this regard. However, there is little knowledge, concerning the morphology, grain size, and formation timing of the dune. This study investigated the geomorphological characteristics of the Moraeul dune using topographic surveys, grain size analyses, and OSL dating. The dune was classified as 'single accreted foredune', which was developed under dense vegetation cover and efficient sand trapping. The dune consisted of fine to medium sand with 1.6Φ of mean grain size, and was covered with pine trees (> 100 years old). The samples from the upper part of the dune yielded quartz OSL ages ranging 0.5 ~ 0.7 ka. Therefore, it is likely that the dune developed at least before the Little Ice Age and became what it is today about one century ago.

• Journal of Forest and Environmental Science
• /
• 제17권1호
• /
• pp.1-17
• /
• 2001

이 연구는 "국유림 경영 현대화 산학 협동 실연 연구"의 일환으로 강원도 평창군 가리왕산 일대 천연활엽수림을 대상으로, 주요 수종별 천연갱신 특성을 평가하여 연구대상 산림의 전반적인 천연갱신에 대한 종합적인 생태적 정보를 제공하고자 실시되었다. 수종별 천연갱신 특성을 요약하면 다음과 같다. 거제수나무 : 비산되는 종자이므로 종자 공급에는 문제가 없으나, 종자 발아를 위해서 노출된 광물질토양이 필요하며, 두꺼운 낙엽층은 종자 발아를 제한한다. 발아 후 갱신치수는 다량의 광선을 필요로 한다. 고로쇠나무 : 내음성은 강하나, 치수의 내건성이 약하므로 50% 이상의 피음을 요구하며, 우량 형질의 임목 조성을 위해 높은 초기 밀도를 유지하여야 한다. 맹아정신력은 높다. 난티나무 : 수분 요구도가 높고 내음성이 약하므로 60% 가량의 상층 울폐도를 유지하여 보습과 광선유입이 원활하여야 하며, 치수 활착을 위해서 관목류 및 기타 식생으로부터 경쟁 요인을 제거한다. 들메나무 : 종자 발아를 위해 광물질 토양의 노출이 필수적이며, 치수 활착을 위해서 다량의 수분과 광선이 요구되고, 지피식생에 의한 치수의 피압이 우려되므로 임지정리작업 도입이 필수적이다. 물푸레나무 : 종자 결실의 풍흉이 심하며, 두꺼운 낙엽층은 종자발아를 제한한다. 치수 활착시 지피식생에 의한 피압이 우려되므로 임지정리작업의 도입이 필수적이다. 신갈나무 : 종자공급의 문제(설치류에 의한 피해) 및 두꺼운 낙엽층 및 조릿대 밀생 지역에서는 종자발아가 제한되며, 치수 발생 후, 임관의 50% 이상을 열어줄 필요가 있고, 맹아갱신력이 높다. 음나무 : 두꺼운 낙엽층은 종자발아를 제한하며, 유령목 생육에 다량의 광선이 요구된다. 젓나무 : 내음성은 강하나, 유령목 단계에서 생육은 극히 저조하다. 층층나무 : 동물에 의해서 종자가 산포되지만 종자 피해는 불가피하며, 발아와 치수 활착을 위해서 다량의 광선이 요구된다. 피나무 : 종자 충실률이 낮고 이중 휴면성 때문에 종자 공급에 어려움이 있으며, 두꺼운 낙엽층은 종자발아의 걸림이 되므로 광물질 토양이 필요하고, 맹아갱신력이 매우 높다.