A cartographer's product is a MAP. A MAP is a two-dimensional representation of the Earth's surface, or of a portion of it, showing features such as countries, cities, rivers, mountains, and other geographical features. Maps are typically drawn to scale, meaning that the size of the features on the MAP correspond to their actual size in the real world. Cartographers use a variety of methods to create maps, including satellite imagery, aerial photography, and field surveys. Maps are used for a variety of purposes, including navigation, planning, and research.