Application of image processing in coastline investigation from Pattani to Narathiwat
การประยุกต์การประมวลผลภาพสำรวจแนวชายฝั่งจังหวัดปัตตานีถึงจังหวัดนราธิวาส

Danupon Tonnayopas, Asst. Prof., D. of Mining and Materials Eng., F. of Eng., PSU.
Chakkrit Kasisuwan, F. of Environmental Management, PSU.
Chao Yongchalermchai, D. of Earth Sci., F. of Natural Resources, PSU.
Corresponding e-mail : tdanupon@ratree.psu.ac.th

Grant : Government Budget and PSU.
Published : Songklanakarin J Sci Technol 2000, 22(3) : 378-390
Key words : coastline, image processing, Landsat-5, Narathiwat, Pattani

The investigation of coastline change from Laem Pho, Pattani to Pak Nam Tak Bai, Narathiwat was performed by using techniques of image processing based on measurement systems. The data were digital Landsat-5 TM imageries (1988 and 1997-1998). The procedures on image processing were the image color composite, exponential stretching, unsupervised and supervised classifications and low pass filtering. These images were transformed from raster data to vector data and registrated them to calculate the changing areas.

This technique revealed that total changing areas covered approximately 4.64 km² (eroded area 1.82 km2 and deposited area 2.82 km²). Particularly, Laem Pho sand spit moved seaward approxi-mately 500 m. Consequently, Pattani bay will be enclosed in 46 years, if the sedimentation process continues without any disturbance to the ecosystem.

---

BACK