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Gis120 lec1 slide_share_practice

  1. 1. Introduction to Remote Sensing GISG120 Michelle KinzelSan Diego Mesa College GIS
  2. 2. What is ‘remote sensing’?
  3. 3. What is ‘remote sensing’?"The use of electronic sensors (or photography) toacquire data related to the electromagneticspectrum in formats that can be analyzednumerically and/or that result in images (pictures)of objects/scenes located in the field of view, all ofwhich can then be applied to the study of theland, sea, air and biotic communities that compriseEarths environments, as well as the principal meansfor obtaining a deep understanding of the vital roleremote sensing plays in exploring the planets andobserving the stars and galaxies well out into theCosmos."
  4. 4. Shorter definition• Remote sensing is the collection of information about an object or system without coming into direct physical contact with it• Art or science???
  5. 5. Syllabus and Course Expectations
  6. 6. By the end of the term you will be able to:• 1. Define and describe remote sensing and explain its applications and history.• 2. Define and describe basics of electromagnetic spectrum and interactions with various types of media.• 3. Describe sensors and image acquisition methods.• 4. Analyze and explain remote sensing purposes, advantages, and limitations.• 5. Describe basic characteristics of remote sensing imagery.• 6. Describe industry-specific image sources, acquire images and apply digital imaging techniques appropriate for an industry-specific project.
  7. 7. How will your earn your grade?• Lab exercises• Midterm• Student Project
  8. 8. Student ProjectRemote sensing application relevant to your areaof interestPart I: Submit a short, 1-page proposalPart II: Present a Powerpoint Presentation of your project We will have a conference style presentation of student projects ALL ARE REQUIRED TO ATTEND (THIS IS PART OF YOUR FINAL EXAM GRADE)
  9. 9. Topics we will cover:Physical principlesHow satellites and sensors workTypes of sensors: Optical Thermal Passive microwave Active microwave Lidar and altimetryApplications: Vegetation mapping and assessment Land cover/land use change Water (oceans, lakes, rivers, snow/ice) Soils, minerals, and geomorphology Urban and societal applications
  10. 10. A Brief Introduction to RemoteSensing and Some Examples
  11. 11. What is ‘remote sensing’?Remote sensing involves the use of instrumentsor sensors to "capture" the spectral and spatialrelations of objects and materials observable ata distance - typically from above them.
  12. 12. What is ‘remote sensing’?Remote sensing is the process of acquiringdata/information about objects/substances notin direct contact with the sensor, by gathering itsinputs using electromagneticradiation, acoustical waves, or force fields thatemanate from the targets of interest.
  13. 13. What is ‘remote sensing’?An aerial photograph is a common example of aremotely sensed (by camera and film, or nowdigital product.
  14. 14. Why do we do remote sensing?• Unobtrusive• Automated• Useful for extreme conditions• Offers excellent spatial and temporal coverage• Provides real time or near-real time observations• Often cost-effective• Extends our senses
  15. 15. How are measurements made?• Ground-based• Airborne• Satellite
  16. 16. Remote Sensing Systems• Active Sensor - illuminates the subject from an artificial energy source• Passive Sensor - uses natural radiation from the Sun or other emitted signal• Imaging Sensor - creates a “picture” by scanning across a linear array of detectors while the array moves through space• Non-imaging Sensor - measures along a transect or at a point
  17. 17. REMOTE SENSING DATA TYPESVisible, infrared, thermal, and microwave are most common
  18. 18. The Remote Sensing Cycle Development Sensor Assessment DataInformation Processing Data Interpretation Analysis
  19. 19. The Remote Sensing Cycle Development Sensor Assessment DataInformation Processing Data Interpretation Analysis
  20. 20. Some examples…
  21. 21. Sea Surface Height
  22. 22. Potential Flood Danger
  23. 23. Mapping Flooding in New Orleans Lidar-derived water depths superimposed over a high resolution SPOT image
  24. 24. Fire Mapping Thermal channels are used to map the location and strength of active fires, and burned area extent. Vegetation maps provide information about fire dynamicsMagpie Fire Burn Smoke plumes areScar Yellowstone tracked for healthNP, August 2006 monitoring
  25. 25. Breakup of the Larsen B Ice Shelf MODIS imagery fro January 31, March 6, 20 Courtesy of Ted Scambos, NSIDC
  26. 26. Mining Wastein Leadville, CO AVIRIS image showing distribution and types of acid- generating minerals
  27. 27. Wetlands ofthe Gulf Coast Multispectral and multiangular views of coastal wetlands off the Gulf Coast MISR