Fig.1 Location of teak plantation in Lampang Province annual rainfall was 1,098 mm. Teak plantation is widely distributed in Lampang. Based on topography, precipitation and temperature, Lampang is the geographic representation of Thai provenances for field trials of teak genetics 14, therefore it was selected for this study. B. Data Used MODIS Data: Surface Reflectance MOD09Q1 of MODIS product providing Bands 1 (Red) and Band 2 (NIR) at 250-meter resolution and MOD09A1 at 500 meter resolution in an 8-day period were used in this study. Cloud cover is present in MOD09Q1 images, which limits the potential of images for ground information extraction. Removing cloud and replacing cloud contaminated pixels is necessary in phenology data extraction. All series of 184 images was applied with cloud removal method, developed by Hoan and Tateishi 15 to provide free cloud data sets for further analysis on teak plantation phenology. 2) Meteorological Records: Climate data used in this study was obtained for the period of 2009-2012 from Thai Meteorological Department. The 4-year variation (2009-2012) of the following climatic factors was analyzed: - Maximum and minimum temperature: the daily maximum and minimum temperatures was averaged and aggregated for an 8-day period. - Accumulated precipitation: the total precipitation was computed for each 8-day period. In general the growing season of teak plantation starts in March or April and ends in January or February of following year 16, therefore whole year meteorological data was used in this study. The nearest meteorological station to study site of teak plantation in Lampang province was used for analyzing correlation between NDVI and climate variables (air temperature and precipitation). 3) Observation Data: The observation data for validation of the NDVI pattern in this study were collected from teak plantation in Mae Mo, Lampang province, Northern Thailand (18°25’N, 99°43’E, 380 meter above sea level) by Yoshifuji et al. 16. Observation data were collected from previous research including the negative logarithm of the ratio of daily downward solar radiation on the forest floor to that above the canopy (NLR) and Leaf Area Index (LAI, m2m−2) 17, 18. The collected data are daily data and in this study, they were aggrerated to 8 days temporal resolution for comparing to teak plantation NDVI (Fig.5). C. Methodology 1) Time Series Analysis for Phenological Metrics of Teak Plantation: At a pixel scale (250 x 250 meter), 46 points NDVI time series revealed seasonal growth of teak plantation in each year. Savitsky-Golay as discussed by 276 Proceedings of the International Conference on Climate Change, Biodiversity and Ecosystem Services for the Sustainable Development Goals (SDGs): Policy and Practice 27-29 June 2016, Cha-am, Phetchaburi, Thailand
Proceedings of International Conference on Climate Change, Biodiversity and Ecosystem Services for the Sustainable Development Goals : Policy and Practice 27-29 June 2016 at the Sirindhorn International Environmental Park, Cha-am, Phetchaburi, Thailand
To see the actual publication please follow the link above