Ms. Soo-Jae Park Profile

Soo-Jae Park

at Pukyong National Univ

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Publications (2)

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Proceedings Article | 22 October 2010 Paper

Inter-annual variation of NDVI over Korea Peninsula using harmonic analysis

In-hwan Kim, Kyung-Soo Han, Kyoung-Jin Pi, Soo-Jae Park, Sang-Il Kim

Proceedings Volume 7824, 78240B (2010) https://doi.org/10.1117/12.868555

KEYWORDS: Vegetation, Climate change, Analytical research, Climatology, Ecosystems, Composites, Remote sensing, Environmental sensing, Satellites, Negative feedback

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Global warming and climatic changes due to human activities impact on marine and terrestrial ecosystems, which feedbacks to climate system. These negative feedbacks amplify or accelerate again global climate change. In particular, life cycle of vegetation sensitively vary according to global climate change. This study attempts to analyze quantitatively vegetation change in Korea peninsula using harmonic analysis. Satellite data was extracted from SPOT/VEGETATION S10 MVC (Maximum Value Composite) NDVI (Normalized Difference Vegetation Index) products during 10 years (1999 to 2008) around Korea peninsula. This NDVI data set was pre-processed to correct noise pixels cause by cloud and ground wetness. Variation of vegetation life cycle was analyzed through amplitudes and phases of annual harmonic components (first harmonic components) per year for two land cover types (cropland and forest). The results clearly show that the peak of vegetation life cycle in Korea peninsula is brought forward to early. Especially, it represents that the phases over low latitudes area between 32.8°N and 38°N steadily decrease every year both forest and cropland. The study estimated that phase values moved up approximately 0.5 day per year in cropland and 0.8 day per year in forest.

Proceedings Article | 10 October 2009 Paper

Water stress monitoring using NDWI around deserts of China and Mongolia

Ga-Lam Lee, Kyung-Soo Han, Jong-Min Yeom, Kyoung-Jin Pi, Soo-Jae Park

Proceedings Volume 7478, 74780Z (2009) https://doi.org/10.1117/12.830260

KEYWORDS: Vegetation, Satellites, Liquids, Climatology, Reflectivity, Absorption, Sensors, Scattering, Temporal resolution, Environmental sensing

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The fluctuation of vegetation water condition around desert area is one of most important parameters to interpret the desertification expansion. United Nations reported that about 35 million square kilometers of land are subject to desertification. Historically, many parts of China have been suffered from severe desertification. This paper attempts an analysis for spatio-temporal variation characteristics of vegetation drought status around China and Mongolia desert with remotely sensed data. Time series images (1 January, 1999 - 31 December 2006) obtained from SPOT/VEGETATION were used to monitor inter-annual variability of water condition. SPOT/VEGETATION satellite, which has a fine temporal resolution and sensitive to vegetation growth, could be very useful to detect large scale dynamics of environmental changes and desertification progress. The main objective of the study is analyzing water status around China and Mongolia desert and predicting a risk area of desertification. In this study, NDWI (Normalized Difference Water Index) is used to monitor vegetation water condition (drought status) over the study area. To interpret the relationship between vegetation drought status and vigor, NDVI (Normalized Difference Vegetation Index) was employed in ensemble with NDWI. Annual total precipitation from NCEP/NCAR reanalysis data is used as subsidiary data. The study area from 73°36´E to 120°41´E longitude and from 30°81´N to 52°13´N longitude in northern China and whole Mongolia. NDWI value around desert has a range from -0.05 to -0.35 and NDWI values are decreased during the study period. Each year precipitation patterns are similar to yearly mean NDWI value. The study detected several areas where NDWI is dramatically decreased for 8 years, especially northeast part of Mongolian Gobi desert and southeast part of China Taklamakan desert.

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