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http://dx.doi.org/10.5532/KJAFM.2019.21.2.97

The use of MODIS atmospheric products to estimate cooling degree days at weather stations in South and North Korea  

Yoo, Byoung Hyun (Department of Plant Science, Seoul National University)
Kim, Kwang Soo (Department of Plant Science, Seoul National University)
Lee, Jihye (National Center for Agro-Meteorology)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.21, no.2, 2019 , pp. 97-109 More about this Journal
Abstract
Degree days have been determined using temperature data measured at nearby weather stations to a site of interest to produce information for supporting decision-making on agricultural production. Alternatively, the data products of Moderate Resolution Imaging Spectroradiometer (MODIS) can be used for estimation of degree days in a given region, e.g., Korean Peninsula. The objective of this study was to develop a simple tool for processing the MODIS product for estimating cooling degree days (CDD), which would help assessment of heat stress conditions for a crop as well as energy requirement for greenhouses. A set of scripts written in R was implemented to obtain temperature profile data for the region of interest. These scripts had functionalities for processing spatial data, which include reprojection, mosaicking, and cropping. A module to extract air temperature at the surface pressure level was also developed using R extension packages such as rgdal and RcppArmadillo. Random forest (RF) models, which estimate mean temperature and CDD with a different set of MODIS data, were trained at 34 sites in South Korea during 2009 - 2018. Then, the values of CDD were calculated over Korean peninsula during the same period using those RF models. It was found that the CDD estimates using the MODIS data explained >74% of the variation in the CDD measurements at the weather stations in North Korea as well as South Korea. These results indicate that temperature data derived from the MODIS atmospheric products would be useful for reliable estimation of CDD. Our results also suggest that the MODIS data can be used for preparation of weather input data for other temperature-based agro-ecological models such as growing degree days or chill units.
Keywords
GDAL; Satellite data; North Korea; Spatial assessment;
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Times Cited By KSCI : 4  (Citation Analysis)
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