Vocabulary Remote Sensing Electromagnetic Spectrum Frequency Landsat Satellite Topex/Poseidon Satellite Global Positioning System Sonar 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World Warm Up Why is it more difficult to know your position on the open ocean than on land? How might satellites be useful in providing information about the positions of objects on Earth? On the open ocean, there are no landmarks to serve as reference points. Possible response: Satellites are high above Earth’s surface, so they can take images of large areas that can be used in locating positions. 4/27/2017 Chapter 2: Mapping Our World

Section 3: Remote Sensing Chapter 2 Section 3: Remote Sensing

Chapter 2: Mapping Our World Remote Sensing Using satellites to collect data about Earth’s surface 4/27/2017 Chapter 2: Mapping Our World

The Electromagnetic Spectrum Satellites detect different wavelengths of energy that come from or are reflected by Earth This energy has electric and magnetic properties Forms: Gamma Rays X-rays Ultraviolet Visible Light Infrared Microwaves Radio Waves 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World Wave Characteristics Travel 300,000 km/s in a vacuum Also known as the speed on light 4/27/2017 Chapter 2: Mapping Our World

Electromagnetic Spectrum EM waves have distinctive wavelengths and frequencies Wavelengths The distance from peak to peak in a wave Frequencies Number of waves that pass through a point in a second f 4/27/2017 Chapter 2: Mapping Our World

Electromagnetic Spectrum Spectrum arranged from shortest wavelength to longest wavelength Gamma rays X-rays Ultraviolet Visible light Infrared Microwaves Radio waves 4/27/2017 Chapter 2: Mapping Our World

Electromagnetic Spectrum Spectrum arranged from lowest energy to highest energy Radio waves Microwaves Infrared Visible light Ultraviolet X-rays Gamma rays 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World LANDSAT Satellites Receives reflected wavelengths of energy from Earth’s surface Rivers and forests are warmer, so they radiate at slightly different frequencies Show up as different colors on images Shows Earth in great detail Used to study movements of Earth’s plates, rivers, earthquakes and pollution 4/27/2017 Chapter 2: Mapping Our World

TOPEX POSEIDON Satellite Uses radar to map features on the ocean floor Bounces high frequency signals off oceans surface Time it takes for signal to bounce back reveals underwater topography 4/27/2017 Chapter 2: Mapping Our World

The Global Positioning System GPS radio wave navigation system Uses at least 24 satellites Allows users to determine position Determines precise longitude and latitude Used for navigation, detecting earthquakes, create maps and tracking wildlife 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World Sea Beam Used to map ocean floor Not located in space, but on a ship Uses sonar (sound waves) to detect and measure underwater objects Used by: Fishing fleets Deep sea drilling operations scientists 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World Section Assessment What is the electromagnetic spectrum? Sequence the forms of electromagnetic spectrum from longest wavelength to shortest wavelength. How do LANDSAT satellites collect and analyze data to map Earth’s surface? What features are mapped by the TOPEX/Poseidon satellite? Describe the mapping process. Describe the Global Positioning Satellite. Explain why electromagnetic waves with short wavelengths have higher frequencies than electromagnetic waves with long wavelengths. Use the following words and phrases to complete a concept map about remote sensing. GPS remote sensing Landsat satellite Topex/Poseidon satellite uses radar to map ocean floor uses visible light and infrared radiation to map Earth’s surface uses microwaves to determine location of user 4/27/2017 Chapter 2: Mapping Our World

Chapter 2: Mapping Our World Homework Section Assessment 2.3, pg 41 Chapter 2 Assessment, pgs 46 + 47 Test Practice, pg 47 Unit 1 Study Guide 4/27/2017 Chapter 2: Mapping Our World