Geographic information of field, which consists of geographical position, shape and area, is one of the most basic information in precision agriculture. Fine fertilizer, irrigation and yield estimation of crops are determined by one of those information.
the shape and area of the field, which is also the main basis of the charge of agriculture machinery working. The conventional measurement for field is using tape manually which is suitable for small and regular field. ฺBut it will be time-consuming and complex when measuring large or irregular field. GPS can provides location and navigation information such as real-time longitude, latitude, elevation and so on. It is one of core technology that support precision agriculture