• Title/Summary/Keyword: Landcover Change Detection

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LANDCOVER CHANGE DETECTION USING MODIS TEMPORAL PROFILE DATA SUPPORED BY ASTER NDVI

  • Yoon, Jong-Suk;Kang, Sung-Jin;Lee, Kyu-Sung
    • Proceedings of the KSRS Conference
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    • 2008.10a
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    • pp.382-385
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    • 2008
  • MODIS images have a great advantage of high temporal resolution to monitor land cover changes in a large area. The moderate and low spatial resolution satellite images are incomparably economic than high resolution satellite images. As diverse satellite images are provided recently, strategies using satellite images are necessary for continuous, effective and long-term land monitoring. This research purposed to use MODIS images to monitor land cover in Korean peninsula for long-term and continuous change detection. To maximize the advantages of high temporal resolution, the change detection was based on the MODIS temporal profiles of the surface reflectance for one year. In this study as the reflectance patterns of year 2005 were compared with the reflectance patterns of year 2007, the changed pixels could be detected during two years. To set up the threshold value for the decision of change, ASTER images with the higher spatial resolution, 15m, were used for this study. The test area covered the suburban area of metropolitan city, Seoul, where the landcover changes have been frequently happened.

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Change Detection of a Small Town Area from Multi-Temporal Aerial Photos using Image Differencing and Image Ratio Techniques (다시기 항공사진으로부터 영상대차법과 영상대비법을 이용한 소도읍 지역의 변화 검출)

  • Lee, Jin-Duk;Yeon, Sang-Ho;Lee, Dong-Ho
    • Journal of the Korean Association of Geographic Information Studies
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    • v.11 no.1
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    • pp.116-124
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    • 2008
  • This study presents the application of multi-temporal and multi-scale panchromatic aerial photos for change detection in a small urban area. For aerial photos of the scale of 1:20,000 taken in 1987 and 1996 and the scale of 1:37,500 taken in 2000. Pre-processing that make the same conditions to all of the aerial photos was carried out through geometric correction, registration, contrasting, resamplimg, and mosaicking and then change detection were carried out respectively by image differencing and image ratio techniques. As a result, the change of urban features and landcover were able to be detected from panchromatic aerial photos that is single-band images and then the detected change results were compared between both techniques.

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AN ADAPTED METHOD FOR REDUCING CHANGE DETECTION ERRORS DUE TO POINTING DIRECTION SHIFTS OF A SATELLITE SENSOR

  • Jeong, Jong-Hyeok;Takagi, Masataka
    • Proceedings of the KSRS Conference
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    • 2005.10a
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    • pp.126-129
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    • 2005
  • Change detections is carried out under the assumption that pixel boundaries of geometrically corrected time series satellite images cover the same location. However that assumption can be wrong when shifts in the pointing direction of a satellite sensor occurs. Currently, although the influence of misregistration on landcover change detection has been investigated, there has been little research on the influence of pointing direction shifts of a satellite sensor. In this study, a simple method for reducing the effects of pointing direction shifts of a satellite sensor is proposed: the classification of two ASTER images was carried out using the linear spectral mixture analysis, the two classification results were resampled into a geometrically fixed grid, and then the change detection of the two ASTER images was carried out by comparing the resampled classification results of the two images. The proposed method showed high performance in discriminating between changed areas and unchanged areas by removing the pointing direction shifts of a satellite sensor.

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A Study on Applying SDSS to Landcover Change Detection for Enhanced Performance (토지피복 변화탐지력 제고를 위한 의사결정방법 도입에 관한 연구)

  • Kim, Sun-Soo;Heo, Yong;Yu, Ki-Yun;Kim, Yong-Il
    • Journal of Korean Society for Geospatial Information Science
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    • v.13 no.2 s.32
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    • pp.3-12
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    • 2005
  • Change detections are widely used for its usefulness. During the process two factors are important; one is which method is to be adopted and the other is what should be the appropriate critical value. Until far, these factors are mostly decided by users based upon their knowledge from past experiences. In this paper we propose a set of methodologies that allow users maintaining optimal decisions on which change detection method is the desirable one, what might be the suitable critical value, and what does the introducing SDSSs(Spatial Decision Support Systems) to change detections means.

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An Analysis of Landcover Change and Temporal Landscape Structure in the Main Ridge Area of the Baekdu Daegan Mountain System (백두대간 마루금 지역의 시계열적 토지피복 변화 및 경관구조 분석)

  • Oh, Jeong-Hak;Kim, Young-Kul;Kwon, Jino
    • Journal of the Korean Association of Geographic Information Studies
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    • v.10 no.3
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    • pp.49-57
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    • 2007
  • The purpose of this study is to analyze contemporary changes of landcover patterns and landscape structure in order to provide basic data and methods for sustainable management and conservation in Baekdu Daegan region using GIS and landscape indices. According to the results based on the pattern analysis of landcover changes using the change detection matrix between 1975 and 2000, addition on $3.6km^2$ became urbanized areas. Otherwise, $85.7km^2$ of forest area shift into agriculture($72.2km^2$) and grass area($10.1km^2$) for the vegetables in highland condition and stock farm. According to the landscape structure analysis using landscape indices, forest areas were unstable forest structures because of fragmentation. Thus, to improve forest ecosystem, significant amount of forest through a new forest management policy considering local environmental conditions are needed. And, the connectivity of forests in local regions should be considered as well.

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Change Detection of a Small Town Area from Multi-Temporal Aerial Photographs (다시기 항공사진으로부터 소도읍 지역의 변화탐지)

  • Lee, Jin-Duk;Yeon, Sang-Ho;Lee, Dong-Ho
    • Proceedings of the Korea Contents Association Conference
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    • 2004.11a
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    • pp.131-137
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    • 2004
  • This study presents the application of multi-temporal aerial photographs in detecting change in a small urban area. For the panchromatic aerial images of the scale of 1/20000 and 1/37500 photographed in 1987, 1996 and 2000, image geometric correction and registration were carried out before performing change detection in a common reference system and then image mosaicking. The image differencing technigue was employed to detect urban features and landcover change and then the results were compared to those of image ratioing techniques. Also threshold values were suggested in applying image differencing for change detection.

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The Reflectance Patterns of land cover During Five Years ($2004{\sim}2008$) Based on MODIS Reflectance Temporal Profiles (시계열 MODIS를 이용한 토지피복의 반사율 패턴: 2004년$\sim$2008년)

  • Yoon, Jong-Suk;Kang, Sung-Jin;Lee, Kyu-Sung
    • Korean Journal of Remote Sensing
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    • v.25 no.2
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    • pp.113-126
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    • 2009
  • With high temporal resolution, four times receiving during a day, MODIS images from Terra and Aqua satellites provide several advantages for monitoring spacious land. Especially, diverse MODIS products related to land, atmosphere, and ocean have been provided with radiance MODIS images. The products such as surface reflectance, NDVI, cloud mask, aerosol etc. are based on theoretical algorithms developed in academic areas. Comparing with other change detection studies mainly using the vegetation index, this study investigated temporal surface reflectance of landcovers for five years from 2004 to 2008. The near infrared (NIR) reflectance in urbanized and burned areas showed considerable difference before and after events. The specific characteristics of surface reflectance temporal profiles are possibly useful for the detection of landcover changes and classification.

Change Detection Using Multispectral Satellite Imagery and Panchromatic Satellite Imagery (다중분광 위성영상과 팬크로매틱 위성영상에 의한 변화 검출)

  • Lee, jin-duk;Han, seung-hee;Cho, hyun-go
    • Proceedings of the Korea Contents Association Conference
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    • 2008.05a
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    • pp.897-901
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    • 2008
  • The objective of this study is to conduct land cover classification respectively using Landsat TM data collected on Oct., 1985 and KOMPSAT-1 EOC data collected on Jan., 2000 covering Gumi city, Gyeongbuk Province and to detect urban change by comparing between both land cover maps. Multispectral images of Landsat TM have spatial resolution of 30m are well known as useful data for extracting information related to landcover, vegetation classification, urban growth analysis and so forth. In contrast, as KOMPSAT-1 EOC collects panchromatic images with relatively high spatial resolution of 6.6m. We try to analyze how accurate landcover classification result is able to be derived from the panchromatic images. As the results of the study, the KOMPSAT EOC data with high resolution greater than 4 times showed higher classification degree than Landsat TM data. It was ascertained that the built-up region was extended by three to four times in the last 15 years between 1985 and 2000. In the contrast, it was shown that the forest region was decreased by 15% to 27% and the grass region including agricultural region was decreased by 28% to 45%.

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A Study on the Priority Area Selection for Updating FDB Attributes using MODIS Product (MODIS Product를 활용한 FDB 속성 갱신 대상지역 선정 연구)

  • Park, Wan-Yong;Eo, Yang-Dam;Kim, Yong-Min;Kim, Chang-Jae
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.1
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    • pp.65-73
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    • 2013
  • FDB(Feature DataBase) attributes have been produced by using the resource data prior to the year 2002. Due to this reason, the attributes need to be updated to the up-to-date ones. In this regards, this study focuses on the way of finding areas whose attributes need to be updated. Forest and crop classes were chosen as target classes among FDB features. MODIS Landcover data and FDB are, first, compared to detect the changed forest and crop areas from 2001 to 2008. Then, vegetation vitality changes are analyzed using MODIS annual NDVI data. Based on the change detection and the vegetation vitality analysis, the index of area selection for updating FDB attributes is proposed in this study.

Landcover Change Detection in Korean Peninsula using MODIS Data (MODIS 영상을 이용한 한반도 토지변화 탐지)

  • Yoon, Jong-Suk;Kang, Sung-Jin;Yoon, Yoe-Sang;Lee, Kyu-Sung
    • Proceedings of the KSRS Conference
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    • 2008.03a
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    • pp.131-136
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    • 2008
  • 중저해상도 영상으로서 공급되고 있는 MODIS영상은 높은 temporal resolution 특성을 가짐으로써 넓은 면적에 대한 토지 이용이나 토지 피복의 변화 탐지에 대한 장점을 제공한다. 또한, 고해상도 영상 자료 또는 관측 자료는 중저해상도 영상과는 비교할 수 없는 경제적인 비용이 필요하게 됨으로써 중저해상도에서 변화를 탐지하여 고해상도 관측 자료를 이용하여 갱신이나 변화의 속성에 대한 구체적인 정보를 추출하는 전략적인 토지 피복에 대한 모니터링 방법이 요구된다. 그러므로 중저해상도 영상 자료는 고해상도 관측 자료를 획득 할 수 있는 일종의 alarm system으로써의 역할을 수행 할 수 있다. 이 연구는 주기적으로 촬영된 MODIS의 영상 자료를 이용하여 한반도에서 일어나는 토지 피복의 변화에 대한 패턴을 알아보고자 한다. 즉, 한반도에서 일어나는 일 년 간의 토지 피복의 변화로 생각할 수 있는 예로는 계절이나 경작에 의한 식생의 변화가 영상에 나타나는 주기적인 패턴을 살펴봄으로써 인간의 개발이나 재해와 같은 영향으로 일어나는 지표면의 이상적인 변화를 탐지하고자 한다. 사용된 영상은 MODIS Lnad product 중 Surface reflectance 8day composite 영상이며, NIR과 RED 밴드에서 나타나는 광학적 특성을 살펴보았다.

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