• Journal of The Korean Society of Agricultural Engineers
• /
• v.53 no.1
• /
• pp.71-81
• /
• 2011

Due to increased human activities and intensive rainfall events in a watershed, soil erosion and sediment transport have been hot issues in many areas of the world. To evaluate soil erosion problems spatially and temporarily, many computer models have been developed and evaluated over the years. However, it would not be reasonable to apply the model to a watershed if topography and environment are different to some degrees. Also, source codes of these models are not always public for modification. The ArcGIS model builder provides ease-of-use interface to develop model by linking several processes and input/output data together. In addition, it would be much easier to modify/enhance the model developed by others. Thus, simple model was developed to decide soil erosion hot spot areas using ArcGIS model builder tool in this study. This tool was applied to a watershed to evaluate model performance. It was found that sediment yield was estimated to be 13.7 ton/ha/yr at the most severe soil erosion hot spot area in the study watershed. As shown in this study, the ArcGIS model builder is an efficient tool to develop simple models without professional programming abilities. The model, developed in this study, is available at http://www.EnvSys.co.kr/~sateec/toolbox for free download. This tool can be easily modified for further enhancement with simple operations within ArcGIS model builder interface. Although very simple soil erosion and sediment yield were developed using model builder and applied to study watershed for soil erosion hot spot area in this study. The approaches shown in this study provides insights for model development and code sharing for the researchers in the related areas.

• Journal of the Korean GEO-environmental Society
• /
• v.14 no.2
• /
• pp.19-29
• /
• 2013

The objective of this study is to develop a new GIS Model for calculating the hydrological geographic parameters efficiently using ArcGIS ModelBuilder. To evaluate the applicability of the new GIS Model, hydrological geographic parameters calculated by WMS and HEC-GeoHMS were compared with 5 geographic parameters from the new GIS Model. 18 reservoirs in Chungdo-gun were selected for this study. Hydrological geographic parameters used in this study are watershed area, stream length, watershed slope, stream slope and curve number. As the results of this study, the average relative error of 5 geographic parameters from all watersheds is shown more than 10.00%. In the results by the new GIS Model, hydrological geographic parameters are better efficiently and accurately to evaluate than those existing models.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.16 no.2
• /
• pp.30-46
• /
• 2013

Using ArcGIS Model Builder, with emphasis on the importance of ecology and user friendliness, a model for site selecting tool is developed. This tool is developed by establishing standardized method for data selection and analysis with evaluation criteria using GIS. For this task, our first action was to objectively define and establish 18 elements to evaluate the potentiality of the site based on extensive literature reviews. These 18 elements reflect environmental, social/cultural and legal aspects that may influence the decision process to select the desired site. Secondly, using ArcGIS Model Builder, 18 analytical elements were made into thematic mapping which represent systematically organized graphic input to the model with automatic double check system and overlay analysis capability. Thirdly, to validate the effectiveness of the developed model, site location analysis was performed using the actual site, Buk-ku, Pohang.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2015.05a
• /
• pp.518-518
• /
• 2015

이 연구에서는 ESRI사의 ArcGIS 프로그램을 이용하여, 한반도 남한지역 중 기후변화시나리오에 의한 강수량이 제공되지 않는 해안선지역에 대해 기후변화시나리오를 이용하여 장래 강수량을 생성할 수 있는 모형을 개발하였다. 기상청에서 제공하는 기후변화 시나리오에 의한 장래강수데이터의 경우 복잡한 해안선지역에 대해 장래 강수데이터를 제공하고 있지 않기 때문에 최근의 지형도를 적용하여 기상청에서 제공하지 않는 지역에 대해 보완격자를 생성하고, 공간보간 기법을 이용하여 이를 해결할 수 있다. 1km 격자단위의 강수데이터를 생성하기 위하여 GIS내에 여러 툴(tools)의 기능을 단계적으로 모형화하여 순서화된 작업을 자동적으로 수행할 수 있는 model builder를 사용하였다. 데이터 변환작업을 위한 전처리, 데이터 보간 추출 기능과 공간보간기법을 적용하여 기후변화 시나리오가 적용된 데이터누락지역에서의 장래 강수예측데이터를 생성할 수 있도록 하였다. 기상청에서 제공하는 RCP 8.5 시나리오를 이용하였고, 일부 해안선과 섬 지역에 대해 장래강수량을 생성할 수 있는 보간기법이 적용된 모형으로 한반도 남한지역 중 강수자료가 제공되지 않는 총 4,186개의 격자에 대해 적합한 공간보간기법을 선택하여, 일단위 및 월단위 강수자료를 생산할 수 있도록 하였다. 기상청에서 제공하는 강수데이터의 경우 'ASCII' 파일 형식으로 기후변화 데이터를 제공하기 때문에 사용자가 별도의 프로그램을 이용하여 강수예측자료를 얻어야 하는 문제가 있다. 강수예측자료를 텍스트파일 형태로 사용자가 원하는 좌표를 선택 한 후 데이터를 추출할 수 있도록 격자화하여 저장되도록 하였다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.5
• /
• pp.3213-3219
• /
• 2014

Currently, increase of greenhouse gas has had a signigicant impact on climate change in urbanization. As a result, the government has been looking for ways to take advantage of the trees that generate oxygen and reduce carbon dioxide for the prevention of climate change. It is essential to extract individual tree for calculating the amount of carbon dioxide reduction of trees. Aerial LIDAR data have three-dimensional information of building as well as trees as form of point clouds. In this study, automated model was developed to extract individual tree using aerial LIDAR data. For this purpose, we established a methodology for extracting trees and then proceeded the process of developing it as an automated model based on model builder of ArcGIS Software. In order to evaluate the applicability of the developed model, the model was compared with commercial software in study area located in Yongin City. Through the experimental result, the proposed model was extract trees 9.91% higher than commercial software. From this results, it was found that the model effectively extracted trees.

• Journal of Korea Water Resources Association
• /
• v.52 no.8
• /
• pp.515-529
• /
• 2019

Geospatial information for river network and watershed boundary have played a fundamental roles in terms of river management, planning and design, hydrological and hydraulic analysis. Irrespective of their importance, the lack of punctual update and improper maintenance in currently available river-related geospatial information systems has revealed inconsistency issues between individual systems and spatial inaccuracy with regard to reflecting dynamically transferring riverine geography. Given that digital elevation models (DEMs) of high spatial resolution enabling to reproduce precise river network are only available adjacent to national rivers, DEMs with poor spatial resolution lead to generate unreliable river network information and thereby reduce their extensible applicabilities. This study first of all evaluated published spatial information available in Korea with respect to their spatial accuracy and consistency, and also provides a methodology and tool to modify existing low resolution of DEMs by means of striation of conventional or digitized river network to replicate input river network in various degree of further delineation. The tool named FSND was designed to be operated in ArcGIS ModelBuilder which ensures to automatically simulate river network striation to DEMs and delineation with different flow accumulation threshold. The FNSD was successfully validated in Seom River basin to identify its replication of given river network manually digitized based on recent aerial photograph in conjunction with a DEM with 30 meter spatial resolution. With the derived accuracy of reproducibility, substantiation of a various order of river network and watershed boundary from the striated DEM posed tangible possibility for highly extending DEMs with low resolution to be capable of producing reliable riverine spatial information subsequently.