Warm-UpWarm-Up

List the possible ways that satellites can List the possible ways that satellites can be used to map the earth. be used to map the earth.

What are the advantages and What are the advantages and disadvantages of using satellites to image disadvantages of using satellites to image earth?earth?

Remote SensingRemote Sensing

the process of collecting the process of collecting data about earth’s surface data about earth’s surface from space from space

based on the based on the electromagnetic spectrum electromagnetic spectrum or charged and or or charged and or magnetic waves given off magnetic waves given off or reflected from earth.or reflected from earth.

http://ceosr.gmu.edu/http://ceosr.gmu.edu/SWC/SWC/hurricane_frances.htmlhurricane_frances.html

Electromagnetic SpectrumElectromagnetic Spectrum

Energy that has has Energy that has has both electric and both electric and magnetic propertiesmagnetic properties

ExamplesExamples Visible LightVisible Light Gamma RaysGamma Rays X-rays X-rays UV-RaysUV-Rays Infared RaysInfared Rays Raido WavesRaido Waves

Wave Characteristics Wave Characteristics

Electromagnetic spectrum is arranged by Electromagnetic spectrum is arranged by wavelength or energy wavelength or energy

All electromagnetic waves travel at the All electromagnetic waves travel at the speed of light- 300,000km/s speed of light- 300,000km/s

Each type of wave has its own frequencyEach type of wave has its own frequency Number of waves passing a particular point Number of waves passing a particular point

per second per second

Landsat SatelliteLandsat Satellite

Receives reflected Receives reflected wave lengths of wave lengths of energy emitted by energy emitted by Earth’s surfaceEarth’s surface

Features that can be Features that can be SeenSeen RiversRivers ForestsForests Radiate Temperature Radiate Temperature

DifferencesDifferences

Tsunami Tsunami

More ImagesMore Images

More PhotosMore Photos

Rainforest Destruction Rainforest Destruction

TodayToday

Topex/Posiedon SatelliteTopex/Posiedon Satellite

Uses radar to map Uses radar to map features of the ocean features of the ocean floorfloor

Global Positioning SystemGlobal Positioning System

SonarSonar