Digital mapping of surficial deposits in Si Mahosot Area, Changwat Prachinburi

Abstract

The study of the digital surficial mapping scales 1:50,000 is in Amphoe Si mahosot of Changwat Prachinburi and Amphoe Phanom Sarakham of Changwat Chachoengsao. The area comprises approximately 723 square kilometers. The extents of coordinates of the study area are approximately defined as 1540000 N, 736000 E northwestern edge and 1516000 N, 767000 E southeastern edge in Universal Transverse Mercator projection with 47 North zone (UTM 47N) in WGS 1984 ellipsoid. The objectives of the research is to study and generate digital surficial deposits map by using digital method which are visual classification and supervised classification from Landsat 8 OLI/TIRS image together with and digital elevation model (DEM) for analysis and interpretation. The result is shown that the surficial units in the study area can be classified into 8 units, namely; unit A, unit B, unit C, unit D, unit E, unit F, unit G and unit H. Each surficial unit has differences digitally characteristics, physical properties of sediments, elevation from MSL and spectral range which are related to geomorphology, depositional environments and land uses. The limitation of this study is the effect of urban disturbance that can be made the mistakes in analysis and interpretation. The mistakes can be corrected by field observation. Furthermore, the technique from this study may be used to further use to systematic map the surficial deposits in the other low land areas in the river floodplain basin with less time in the large area and should be very productive to update for the more accurate surficial deposits. Besides, the result from this study is hopefully to be further fruitful applied to be used for better land use management and mitigation of the natural disasters in the study area in the future.