New technology has allowed us to study the Earths surface more extensively and accurately, thanki to space surveys and satellites. This has helped us get a better understanding of the Earth. Thailand has its own satellite to observe natural resources named THEOS (Thailand Earthobservation System). The advantages of using satellite photographs are getting current and accurate information. It is also a more time and cost-efficient way of collecting data than hiring works to survey the land. Decoding satellite photographs We consider the colours, patterns, shapes, high-ow areas, and the relationship between features in a photo.