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차연산과 분광미분을 이용한 항공 초분광영상의 식생지수 산출 적절밴드 선택
김태우 ( Tae Woo Kim ),위광재 ( Gwang Jae We ),서용철 ( Yong Cheol Suh ) 한국지리정보학회 2013 한국지리정보학회지 Vol.16 No.4
Recently the various applications and spectral indices development of airborne hyperspectral imagery(A-HSI) has been increased. Especially the vegetation indices (VIs) were used to verify stress and vigor of vegetation. The VIs needs two or more spectral bands selectively to calculate as NIR(near infrared) and red wavelength. The A-HIS has specific band characteristics as narrow, continues and many. The A-HIS has narrow, continues and many specific band characteristics. That could be make it confuse which of bands could be explained for appropriate vegetation characteristics. If the A-HIS bands is not the same the wavelength with VIs`development band setting, then it need a selection adequate for spectral characteristics of target vegetation. Therefore we set 4 substitute bands for NIR and red wavelength respectively and calculated two VIs combined with substitute bands such as NDVI(normalized difference vegetation index) and MSRI(modified simple ratio index). To consider the variation of each VIs, we adapted the image differencing method of change detection technique. Also, we used spectral derivative to identify appropriate bands for spectral characteristics of digital forest cover type map. The result of adequate bands for two VIs selected red #3 as 680.2nm and NIR #2 as 801.7nm. This wavelength was good for any forest type in low variations.
항공수심측량 촬영설계 소프트웨어 개발을 위한 요구사항 분석
김동욱(Kim, Dong Wook),고아라(Goh Ara),김은영(Kim, Eun Young),위광재(We Gwang Jae) 한국측량학회 2016 한국측량학회 학술대회자료집 Vol.2016 No.4
항공수심측량 장비를 이용하여 수심정보를 획득하기 위해서는 비행코스에 대한 설계가 필요하다. 비행코스를 설계하기 위해서는 촬영 센서 및 비행체의 운용 환경 등에 대한 정보가 입력되어야 하며 특히 수심측량의 경우에는 연안 지역에 대한 조석 정보도 필요하다. 본 논문에서는 이러한 정보들을 반영하여 비행코스를 설계할 수 있는 소프트웨어의 개발 과정에 대해서 설명하고자 한다. 소프트웨어 분석 시에는 해외 소프트웨어의 조사 및 요구 사항의 분석을 통해 소프트웨어에 대한 전체 구현요소를 정의하였다. Designing flight course is necessary in order to acquire depth information using bathymetry equipment. To design a flight course, we must enter information about sensor and operating environment of the vehicle. In particular, tide information is needed for the bathymetry of the coastal area. In this paper, we described software development process that reflects these information. In case of software analysis, we define overall requirement of software through investigation of common use software, analysis of usecase.
다중시기 영상자료를 이용한 을숙도 습지 지역의 정성적 변화분석
이재원 ( Jae One Lee ),김용석 ( Yong Suk Kim ),위광재 ( Gwang Jae We ) 한국지리정보학회 2010 한국지리정보학회지 Vol.13 No.2
This research collected some multi-image information of Nakdong River Estuary Eulsukdo area in last 30 years, which are used as the basis information in running the qualitative analysis of the topography relief`s deformation. First, to obtain the data, this research carried out a field survey and GCP measurement, then classified and collected the image information by analog and digital image. The acquired images which have passed a high-precise scan process and geometric correction is manufactured by Ortho Mosaic image, then divided them into 9 sections time period classification before we run a qualitative analysis. In late of 1980`s there are many changes of environmental topography deformation of the Eulsukdo area which caused by large scale building constructions, appeared to be known through this research. And then in late of 1990`s, we organized the wild cultivated lands, started the wetland restoration of the artificial ecology, in 2000`s we are able to know the existence of topograph relief change which caused by big scale of bridge construction. Hereafter, in this quick process of the environmental and topographical change of this area caused by the 4 major rivers restoration project, the analysis results of this experiment are expected to be something applicable as important basic data.
분광각매퍼 기법을 적용한 항공기 탑재 초분광영상의 소규모 녹지공간 탐지
김태우 ( Tae Woo Kim ),최돈정 ( Don Jeong Choi ),위광재 ( Gwang Jae We ),서용철 ( Yong Cheol Suh ) 한국지리정보학회 2013 한국지리정보학회지 Vol.16 No.2
Urban green space is one of most important aspects of urban infrastructure for improving the quality of life of city dwellers as it reduces the heat island effect and is used for recreation and relaxation. However, no systematic management of urban green space has been introduced in Korea as past practices focused on efficient development. A way to calculate the amount of green space needed to complement an urban area must be developed to preserve urban green space and to determine ``regulations determining the total amount of greenery``. In recent years, various studies have quantified urban green space and infrastructure using remotely sensed data. However, it is difficult to detect a myriad small green spaces in a city effectively when considering the spatial resolution of the data used in existing research. In this paper, we quantified small urban green spaces using CASI-1500 hyperspectral imagery. We calculated MCARI, a vegetation index for hyperspectral imagery, to evaluate the greenness of small green spaces. In addition, we applied image-classification methods, including the ISODATA algorithm and Spectral Angle Mapper, to detect small green spaces using supervised and unsupervised classifications. This could be used to categorize land-cover into four classes: unclassified, impervious, suspected green, and vegetation green.