• Title/Summary/Keyword: landuse map

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Runoff Characteristics of Rapid Urban Expansion Area according to The Type of Land Use (급속한 도시확장지역의 토지이용도 종류에 따른 유출특성 비교)

  • Park, Ki-Bum
    • Journal of Environmental Science International
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    • v.22 no.9
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    • pp.1079-1088
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    • 2013
  • The objective of this paper is compare to landuse type for calculating peak flood and soil loss in rapidly expansion urban area. This study compares two landuse maps, including numerical landuse map and aerial photograph landuse map, for calculating the ratio of urban and agriculural area, curve number, time of concentration, peak flood discharge, and soil loss. It is found that flood discharge calculated using aerial photograph landuse map are larger than that calculated using numerical landuse map, and soil loss calculated using aerial photograph landuse map are smaller than that calculated using numerical landuse map. Results also indicate that landuse chage in rapidly expansion urban area significantly influences flood discharge and soil loss.

A Study of Land Suitability Analysis by Integrating GSIS with Artificial Neural Networks (GSIS와 인공신경망의 결합에 의한 토지적합성분석에 관한 연구)

  • 양옥진;정영동
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.18 no.2
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    • pp.179-189
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    • 2000
  • This study is tried to organic combination in implementing the suitability analysis of urban landuse between GSIS and ANN(Artificial Neural Network). ANN has merit that can decide rationally connectivity weights among neural network nodes through procedure of learning. It is estimated to be possible that replacing the weight among factors needed in spatial analysis of the connectivity weight on neural network. This study is composed of two kinds of neural networks to be executed. First neural network was used in the suitability analysis of landuse and second one was oriented to analyze of optimum landuse pattern. These neural networks were learned with back-propagation algorithm using the steepest gradient which is embodied by C++ program and used sigmoid function as a active function. Analysis results show landuse suitability map and optimum landuse pattern of study area consisted of residental, commercial. industrial and green zone in present zoning system. Each result map was written by the Grid format of Arc/Info. Also, suitability area presented in the suitability map and optimum landuse pattern show distribution pattern consistent with theroretical concept or urban landuse plan in aspect of location and space structure.

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Application of GIS for Runoff Simulation in Ungaged Basin(I): Selection of Soil Map and Landuse Map (미계측 유역의 유출모의를 위한 지리정보시스템의 응용(I) : 토양도 및 토지이용도의 선정)

  • Kim, Gyeong-Tak;Sim, Myeong-Pil
    • Journal of Korea Water Resources Association
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    • v.32 no.2
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    • pp.163-176
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    • 1999
  • Hydrology-based topographical informations generated by GIS techniques could be changed according to the selection of base map, algorithm of extraction, and so on. The purpose of this paper is to investigate the variation of SCS CN extracted by GIS technique and to propose the effective strategy for applying GIS to the rainfall-runoff simulation in ungaged basin. For experimental implementation, GIS spatial data, such as reconnaissance soil map, detailed interpretative soil map, landuse planning map and remotely sensed data(Landsat TM), were collected and generated to calculate the amount of effective rainfall in Pyungchang river basin. In applying SCS Runoff Curve Number to the test basin, the hydrological attribute data were analyzed. In addition, the characteristics of runoff responses according to the selection of GIS spatial data for SCS CN were reviewed. This study shows the applicability of GIS techniques to runoff simulation in ungaged basin by comparing with the measured flood hydrograph. It has been found that the detained interpretative soil map and remote sensing data are appropriate for calculating of SCS CN.

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A Study to Extract Landuse Information from Digital Topographic Map in Urban Area (수치지형도를 이용한 도시지역 토지이용정보 추출기법에 관한 연구)

  • Min, Sook-Joo;Kim, Kye-Hyun;Kim, Kyoung-Soon
    • Journal of Korean Society for Geospatial Information Science
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    • v.12 no.3 s.30
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    • pp.13-21
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    • 2004
  • Landuse information is used to plan land use, urban and environmental management as base data. And, demand for landuse information is rising due to ecological consideration. But existing method to extract landuse information from aerial photographs or field survey is consume a lot of time and cost. In urban area where the pattern of landuse is densely aggregated, a landuse information needs to be classified in detail for urban planning and management. Therefore this study aims to examine the method to extract landuse information in detail from 1:1,000 digital topographic data. For the purpose, the method was applied to a part of metropolitan Seoul. The results of study shows that extraction of landuse information except forest area is possible. Forest area is needed to describe smaller spatial unit. For the future, the method of describing forest area is improved it will be effectively applicable for the city maintenance.

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Development of PRe-processor for Hydrologic Geographic Information System (지리정보시스템을 이용한 수문모형의 전처리시스템 개발)

  • 전종안;박승우;강문성;김상민
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 1999.10c
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    • pp.493-498
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    • 1999
  • To extract hydrologic information more easily , the pre-processor for hydrologic model using Geographic Information System was developed . This model was applied to the Balan-reservoir watershed which is located at the southwest of Suwon. For estimation SCS curve number, landuse map and hydrologic soil group map were collected from digital map and reconnaissance soil map respectively. The estimated curve number from the GIS technique was 73.

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FEASIBILITY MAPPING OF GROUND WATER YIELD CHARACTERISTICS USING WEIGHT OF EVIDENCE TECHNIQUE: A CASE STUDY

  • Heo, Seon-Hee;Lee, Ki-Won
    • Proceedings of the KSRS Conference
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    • 2005.10a
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    • pp.430-433
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    • 2005
  • In this study, weight of evidence(WOE) technique based on the bayesian method was applied to estimate the groundwater yield characteristics in the Pocheon area in Kyungki-do. The ground water preservation depends on many hydrogeologic factors that include hydrologic data, landuse data, topographic data, geological map and other natural materials, even with man-made things. All these data can be digitally collected and managed by GIS database. In the applied technique of WOE, The prior probabilities were estimated as the factors that affect the yield on lineament, geology, drainage pattern or river system density, landuse and soil. We calculated the value of the Weight W+, W- of each factor and estimated the contrast value of it. Results by the ground water yield characteristic calculations were presented in the form of posterior probability map to the consideration of in-situ samples. It is concluded that this technique is regarded as one of the effective technique for the feasibility mapping related to detection of groundwater bearing zones and its spatial pattern.

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A Comparative Study on Estimation Methodologies of Carbon Sequestration Amount by Vegetation for Environmental Impact Assessment on Development Projects (개발사업 환경영향평가시 식생의 탄소저장 및 흡수량 산정법에 대한 비교)

  • Hwang, Sang Il;Park, Sun Hwan
    • Journal of Environmental Impact Assessment
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    • v.20 no.4
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    • pp.477-487
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    • 2011
  • In this study, we deduced the best estimation methodology for amount of carbon sequestration by vegetation, through the case study using the data obtainable from the environmental assessment procedure. Our results showed that the estimation methodology using the national vegetation map was the best for the strategic environmental assessment, whileas those using the vegetation growth equation were applicable for environmental impact assessment procedure. Furthermore, we found that the amount of carbon sequestration by farmland and/or grassland, not by vegetation, was not negligible. Therefore, we concluded that the area of farmland and/or grassland need to be taken into account during the landuse planning.

Assessment of Groundwater Contamination Vulnerability in Miryang City, Korea using Advanced DRASTIC and fuzzy Techniques on the GIS Platform (개선된 DRASTIC 기법과 퍼지기법을 이용한 밀양지역 지하수오염 취약성 평가)

  • Chung, Sang Yong;Elzain, Hussam Eldin;Senapathi, Venkatramanan;Park, Kye-Hun;Kwon, Hae-Woo;Yoo, In Kol;Oh, Hae Rim
    • Journal of Soil and Groundwater Environment
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    • v.23 no.4
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    • pp.26-41
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    • 2018
  • The purpose of this study is to improve the Original DRASTIC Model (ODM) for the assessment of groundwater contamination vulnerability on the GIS platform. Miryang City of urban and rural features was selected for the study area to accomplish the research purpose. Advanced DRASTIC Model (ADM) was developed adding two more DRASTIC factors of lineament density and landuse to ODM. The fuzzy logic was also applied to ODM and ADM to improve their ability in evaluating the groundwater contamination vulnerability. Although the vulnerability map of ADM was a little simpler than that of ODM, it increased the area of the low vulnerability sector. The groundwater vulnerability maps of ODM and ADM using DRASTIC Indices represented the more detailed descriptions than those from the overlap of thematic maps, and their qualities were improved by the application of fuzzy technique. The vulnerability maps of ODM, ADM and FDM was evaluated by NO3-N concentrations in the study area. It was proved that ADM including lineament density and landuse factors produced a more reliable groundwater vulnerability map, and fuzzy ADM (FDM) made the best detailed groundwater vulnerability map with the significant statistical results.

Calibration of HSPF Hydrology Parameters Using HSPEXP Model Performance Criteria (HSPEXP 모형평가지표 이용한 HSPF 모형의 수문매개변수 보정)

  • Kim, Sang-Min;Seong, Choung-Hyun;Park, Seung-Woo
    • Journal of The Korean Society of Agricultural Engineers
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    • v.51 no.4
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    • pp.15-20
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    • 2009
  • The purpose of this study was to test the applicability of the HSPEXP model performance criteria for calibrating hydrologic parameters of HSPF. Baran watershed, located at Whasung city, was selected as a study watershed in this study. Input data for the HSPF model were obtained from the digital elevation map, landuse map, soil map and others. Water flow data from 1996 to 2000 was used for calibration and from 2002 to 2007 was for validation. Using the HSPEXP decision-support software, hydrology parameters were adjusted based on total volume, then low flows, storm flows, and finally seasonal flows. Suggested criteria for each model performance variables were referenced from the previous research. For the calibration period, all the HSPEXP model performance criteria were satisfied while two criteria were slightly violated for the validation period.

Analysis of Susceptibility in Landslide Distribution Areas (산사태 발생지역에서의 민감성 분석에 관한 연구)

  • 양인태;유영걸;천기선;전우현
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2004.11a
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    • pp.381-384
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    • 2004
  • The goal of this study is to generate a landslide susceptibility map using GIS(geographic information system) based method. A simple and efficient algorithm is proposed to generate a landslide susceptibility map from DEM(digital elevation model) and existing maps. The categories of controlling factors for landslides, aspect of slope, soil, topographical index, landuse, vegetation are defined, because those factors are said to have relevance to landslide and are easy to obtain theirs sources. The weight value for landslide susceptibility is calculated from the density of the area of landslide blocks in each class. Finally, a map of susceptibility zones is produced using the weight value of all controlling factors, and then each susceptibility zone is evaluated by comparing with the distribution of each controlling factor class.

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