Application of Remote Sensing for Monitoring Land Use Change in Songkhla Lake at Songkhla province, Thailand

摘要

Songkhla Lake is a large water reservoir which has a diverse ecological system. The area consists of Mangrove forest, aquaculture, and aquatic creatures. It is natural resource in the economical value added to the local people of agriculture and eco- tourism. At present, inadequate awareness on using of natural resources causes tremendous land use change and decreases of aquatic bio-diversity. This study was aimed to monitor land use change in Songkhla Lake during 1999 to 2009 using LANDSAT- 5 TM satellite images. The study was performed in 3 interval periods: 1999-2004, 2004-2009 and 1999-2009. Land use was classified base on object- based concept, visual interpretation and field survey. Land use of the 3 periods was then overlaid to determine their changes. By using visual interpretation of Landsat-5 TM image in the period of 1999-2009 land use categories were classified including, (1) Shrimp Farm, (2) Paddy Field, (3) Oil Palm plantation, (4) Mangrove forest, (5) Rain forest, (6) Crop area, (7) Rubber Plantation, (8) Orchard, (9) Other (10) Urban (1 l)Water Sources. Majority of the land use is rubber plantation covering 2,916.33 sq.km. in 1999, 2,931.51 sq.km in 2004, and 2,980. sq.km in 2009. When the land use change during 1999-2004 was analyzed, it was found that the Rubber Plantation showed the highest exansion. Para rubber plantation increased 0.58 sq.km. in 3 periods and change from Rain forest can see in One -Way change, shows a high percentage of change from Rain forest area into Para rubber plantation and Two-way change, Mangrove forest in 1999 had changed to other area in 2004 and changed back to Mangrove forest area in 2009. The area of Mangrove forest changed most, accounted for 29.50 sq.km.