What is the defining feature of a satellite map?

The defining feature of a satellite map is that it is created from satellite images of the Earth. Satellite maps utilize data captured by satellites orbiting the Earth, which allows for a comprehensive and detailed view of the Earth's surface. This method provides a unique perspective that can include features such as terrain, vegetation, urban development, and even the layout of various landscapes. By employing imagery taken from space, these maps can cover vast areas in a single image and are used for numerous applications, ranging from scientific research to urban planning.

The other options, while relevant to different types of maps or data, do not capture the essence of what a satellite map is. For example, while some maps may showcase political boundaries, this characteristic is not a defining feature of satellite maps specifically. Similarly, mapping historical changes in land use and displaying real-time weather data pertain to other mapping techniques or datasets, rather than being inherent to satellite imagery itself. Therefore, the uniqueness of satellite maps lies in their reliance on satellite imagery to illustrate geographic information.