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Remote Sensing

Remote Sensing. CRSC 6 – Intro to Precision Ag Fall 2004 October 1, 2004. What is Remote Sensing?. “The acquisition of information about an object without being in physical contact with it." (Charles Elachi) Value is the Ability to Acquire a lot of information In a very short time

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Remote Sensing

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  1. Remote Sensing CRSC 6 – Intro to Precision Ag Fall 2004 October 1, 2004 CRSC 6 October 1, 2004

  2. What is Remote Sensing? • “The acquisition of information about an object without being in physical contact with it." (Charles Elachi) • Value is the Ability to • Acquire a lot of information • In a very short time • With minimal labor input CRSC 6 October 1, 2004

  3. Platforms • Done with many different platforms • Satellites • Aircraft • Mobile Platform CRSC 6 October 1, 2004

  4. Interaction CRSC 6 October 1, 2004

  5. Electromagnetic Energy • Involves the measurement of electromagnetic energy CRSC 6 October 1, 2004

  6. Electromagnetic Spectrum CRSC 6 October 1, 2004

  7. Normalized Difference Vegetation Index (NDVI) (NIR - VIS)/(NIR + VIS) Calibrated Vegetation Map Enhanced Vegetation Index (EVI) Vegetation Change Map Greenness Index Soil Color Map Indices CRSC 6 October 1, 2004

  8. Indices CRSC 6 October 1, 2004

  9. Measures of Performance • Spatial Resolution • Spectral Response • Spectral Resolution • Frequency of Coverage CRSC 6 October 1, 2004

  10. Spatial Resolution • The size of the smallest object that can be distinguished in an image. CRSC 6 October 1, 2004

  11. Spectral Response • The ability to respond to radiation measurements within a spectral band. CRSC 6 October 1, 2004

  12. Spectral Resolution • The ability to differentiate between electromagnetic radiation of different wavelengths. Landsat TM image (bands 6-4-2) Alto Image (comparable bands CRSC 6 October 1, 2004

  13. Frequency of Coverage • How often a sensing system is available to collect data. CRSC 6 October 1, 2004

  14. Other Considerations • Timeliness of Provider • Cost of Service • Projection and Coordinate System Used • Ground Truthing CRSC 6 October 1, 2004

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