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CHAPTER 3

FUNDAMENTALS. CHAPTER 3. Satellites, Sensors and Data Forms. A. Dermanis. SATELLITES & SENSORS. LANDSAT 7 SATELLITE. SPOT 4 SATELLITE. 2 HRVIR High Resolution Visible Infrrared 4 bands. ETM+ Enhanced Thematic Mapper 7 bands. A. Dermanis. A. Dermanis. A. Dermanis. A. Dermanis.

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CHAPTER 3

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  1. FUNDAMENTALS CHAPTER 3 Satellites, Sensors and Data Forms A. Dermanis

  2. SATELLITES & SENSORS LANDSAT 7 SATELLITE SPOT 4 SATELLITE 2 HRVIR High Resolution Visible Infrrared 4 bands ETM+ Enhanced Thematic Mapper 7 bands A. Dermanis

  3. A. Dermanis

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  6. HYPERSPECTRAL SENSORS A. Dermanis

  7. Spatial Resolution: no of pixels per ground area Increases when pixels become smaller Spectral Resolution: no of bands per wavelength Overall: increases with number of bands Locally: increases when wavelength difference between successive bands becomes smaller Temporal al Resolution: no of imaging repetitions per time Increases when days between revisiting an area become fewer Radiometric Resolution: no of values for grey tone variation = 2p p = number of bits per single (integer) value Increases with number of bits p DATA RESOLUTION A. Dermanis

  8. one image for each band covering the same ground area Field Of View no of bands Instantaneous Field Of View THE DATA for each band: image = matrix of pixels with R rows & C columns pixel xij A. Dermanis

  9. BSQ: Band Sequential BIL: Band Interleaved by Pixel BIL: Band Interleaved by Line DATA FORMATS A. Dermanis

  10. DATA PRESENTATION Each band in Black & White black pixel value 1 (0 reserves as “no data” code) white  pixel value max (2p) 3 bands in a color composite red  pixel value of 1st band green  pixel value of 2nd band blue  pixel value of 3rd band 1st, 2nd, 3rd band = = any 3 bands in any order The RGB Color System A. Dermanis

  11. Landsat Thematic Mapper 7 bands Band 1 Band 2 Band 3 Band 4 Band 5 Band 7 Band 6 Color composites 321 432 742 754 574 A. Dermanis

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