A Study of Change in Forest Area during 2013-2022 in the Sri Lanna National Park, Chiang Mai Province

Main Article Content

Alongkot Pakat
Bhupichit Chouibumroong
Siriluk Janekarnwanit

Abstract

The objective of this study was to apply remote sensing techniques to examine the changes in the forested area around the Sri Lanna National Park during a period of 10 years from 2013–2022, using computer-based classification of Landsat 8 OLI satellite data. Supervised classification techniques were used in conjunction with visual interpretation, which included the use of GIS (geographic information system) to assist in data management. At least 500 inspection points were used around the Sri Lanna National Park to determine the accuracy of the classification by using an error matrix or confusion matrix table and Kappa statistics.


Using the classification, it was observed that the forested area decreased by 4,439 rai (710.24 ha) between 2013–2022, with the most decrease experienced during the past 10 years. Specifically, between 2014–2015, the area decreased by 1,308 rai (209.28 ha), 2015–2016 decreased by 605 rai (96.80 ha), 2016–2017 decreased by 1,988 rai (318.08 ha), 2017–2018 decreased by 863 rai (138.08 ha), 2018–2019 decreased by 297 rai (47.52 ha), in 2019–2020 decreased by 353 rai (57.28 ha), in 2020–2021 decreased by 386 rai (61.76 ha), and in 2021–2022 decreased by 153 rai (24.48 ha), was the least decrease during the 10 years analyzed. The classification accuracy for each year indicated to an average overall accuracy of about 85.54 percent and a Kappa statistic of 77.74 percent. The trend of change in the forested areas was a polynomial of the 3rd order as described by the equation y = -0.0322x3 + 195.19x2 - 394313x + 3E+08 (R² = 0.9789), where x is the year of interest.

Article Details

How to Cite
Pakat, A., Chouibumroong, B. ., & Janekarnwanit, S. . (2023). A Study of Change in Forest Area during 2013-2022 in the Sri Lanna National Park, Chiang Mai Province. Thai Journal of Forestry, 42(2), 50–62. Retrieved from https://li01.tci-thaijo.org/index.php/tjf/article/view/258586
Section
Original Articles

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