Last page of mapping notes

MAP LEGENDS A map legend explains what the symbols on a map represent

MAP SCALE The ratio between distances on a map and actual distances on the surface of Earth

Fractional Scale: Expresses distance as a ratio Verbal Scale: Expresses distance as a statement Graphic Scale: A line that represents a certain distance

Process of collecting data about Earth from far above the Earth’s surface Satellites detect different wavelengths of energy reflected or emitted from Earth’s surface Energy has both magnetic and electric properties REMOTE SENSING

ELECTROMAGNETIC SPECTRUM The range of electromagnetic radiation waves

Plants reflections IR range

Types of Remote Sensing Landsat: Receives reflected wavelengths of energy emitted by Earth’s surface Used to identify features on Earth’s surface and to study the movements of Earth’s plates, rivers, earthquakes and pollution

Types of Remote Sensing Topex/Poseidon Satellite: Use radar to map features on the ocean floor

Types of Remote Sensing GPS (Global Positioning System): Radio-navigation system of at least 24 satellites that allow users to determine their exact position on Earth. Calculates your latitude/longitude/speed/etc.

Types of Remote Sensing Sea Beam: Used to map the ocean floor Located on an ocean ship Uses sonar (sound waves)