A good rule of thumb of the ground control points should be at a minimum of 30 to 50 points per land use/land cover class (Congalton and Green 1999). In this study, a total of 256 GPS points (122 points from Doykao and 134 points from Paklong) or around 30 points per land use class, were recorded during June to July, 2014 (approximately 4-5 months after acquisition date of Landsat image 2014).