Proceedings, XXth congress: Proceedings, XXth congress

Altan, M. Orhan

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Persistent identifier:: 1663674213

Title:: Proceedings, XXth congress

Sub title:: Istanbul, 12 - 23 July 2004

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1663674213

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.; Auch bezeichnet als XXth International Congress for Photogrammetry and Remote Sensing

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Document type:: Multivolume work

Volume

Persistent identifier:: 166368779X

Title:: Proceedings, XXth congress

Scope:: IV, 226 Seiten

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 166368779X

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(35,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: QUALITY ASSESSMENT OF GLOBAL MODIS LAI PRODUCT FOR THE REGIONAL SCALE APPLICATIONS Sun-Hwa Kim and Kyu-Sung Lee

Document type:: Multivolume work

Structure type:: Chapter

bul 2004 further above, are. jp. 66- Vesley, -April, 3) 2003) - 14772 r. Volker for the hout the partment ary data, /e would titute for ware and ially Mr. QUALITY ASSESSMENT OF GLOBAL MODIS LAI PRODUCT FOR THE REGIONAL SCALE APPLICATIONS Sun-Hwa Kim' and Kyu-Sung Lee Department of Geoinformatic Engineering, Inha University, Incheon, S. KOREA 22032128 @inhavision.inha.ac.kr KEY WORDS: Remote Sensing, Ecology, Forestry, Accuracy, Quality, Algorithm ABSTRACT: MODIS LAI product has been increasingly important for analyzing the process and productivity of terrestrial ecosystems at global scale. This study was aimed to assess the quality of global MODIS LAI product for applications in regional and even in local scales. To examine the quality of MODIS LAI data, we produced a reference LAI map that was derived by relating the ground-measured LAI to Landsat ETM+ reflectance over the forest of the Kyongan watershed in central Korean peninsula. After the reference LAI map was rescaled at 1 km spatial resolution, it was compared with the MODIS LAI product that was generated about the same time with the reference data. From the comparison between the MODIS LAI and the reference LAI, it was found that MODIS LAI values were slightly higher at the forestland than the reference map and they were generally lower in grasslands and croplands. Specially, MODIS LAI pixels estimated by the backup algorithm by using NDVI were obviously under-estimated comparing with the reference LAI value. The MODIS LAI pixels that were attenuated by cloud cover also showed large difference from the reference LAI value. The discrepancy between the MODIS LAI and the reference LAI can be also caused by the misclassification of MODIS land cover product that is one of the input variable to create MODIS LAI The quality of MODIS LAI product was largely dependent on the estimation algorithm, cloud cover, and the accuracy of MODIS land cover product. e INTRODUCTION Although it has been relatively new since we are able to get MODIS LAI product, the estimation algorithm development started since the early 1990's. After launching the EOS terra satellite in 1999, the Moderate Resolution Imaging Spectrometer (MODIS) has begun to deliver 1km global scale LAI products. EOS program progressed the validation of MODIS products with production of MODIS data. After 2003, the papers about validation of provisional MODIS products were began to introduce. Main products of validation were MODIS land cover and LAI products. The cases of validation of MODIS LAI product have two parts, which are the validation of LAI Radiative Transfer algorithm itself and the accuracy of LAI product by using empirical methods (Tian et al., 2002; Cohen et al., 2003). Since MODIS LAI product was primarily designed at global and continental scales, the validation of various geographic areas must be continued in local or global scale. The validity of MODIS global LAI product is being analyzed at several sites over the world, but it is rare to find any studies of analyzing at temperate forest in northeast Asia. Leaf Area Index (LAI) has been an important parameter that is directly related to the photosynthesis, evapotranspiration, and the productivity of plant ecosystem (Bonan, 1993). Measurement of LAI in the field is very difficult, and requires a great amount of time and efforts (Gower et al., 1999). The mapping of LAI in large geographic area may be impossible when we rely on the field measurement. To solve this problem, there have been continuing efforts to develop methodologies to estimate LAI using remote sensor data (Turner et al., 1999). The normalized difference vegetation index (NDVI) was the most commonly used, however, showed the saturation phenomenon in high LAI value (Chen and Cihlar, 1996; Carlson and Reley, 1997). Although empirical modeling is relatively easy and useful method for relating field measured % Corresponding author 27 LAI to remote sensor data, several factors have certain influence empirical model (Cohen et al., 2003). The vegetation type, canopy structure, background, atmospheric conditions, and topographic conditions were affects the empirical model (Tian et al., 2000; Panferov et al., 2001). In this study, we are attempted to determine the validity of MODIS global LAI product at temperate forest in northeast Asia. Terrestrial ecosystem in this region is vulnerable to several factors of environmental perturbations. MODIS LAI product can be an invaluable source of information for analyzing the status and activity of vegetation at regional and local scale. METHODS Study area The study area, the Kyongan Watershed, is located near the Seoul metropolitan area in central Korean peninsula. The study area covered about 1,070km? area and 6796 of them is forest. Two third of the forest is natural forest of mixed deciduous species, in which the dominant species are oaks (Quercus mongolica) mixed with natural pine species. The remaining one third of the forest is coniferous plantation stands of Korea pine (Pinus karaiensis), Pitch pine (Pinus rigida), and Larch (Larix leptolepis). Except for a few plantation forest stands, most forests have very dense canopy closure over 80% and average tree age ranges from 20 to 50 years. The study area has been an experimental watershed for many years to study local-scale runoff and water quality monitoring, in which site-specific LAI estimate can be a variable of interest for the hydrological studies (Lee et al., 2003).

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