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

2. 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

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

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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

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

15. 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

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