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Discussion on

Discussion on. Prata et al. 1995: Thermal Remote Sensing of Land Surface Temperature from Satellite: Current Status and Future Prospects. . Which range of wavelength of this paper discuss?. Shortwave? Near Infrared? Thermal Infrared? What two channels of AVHRR used in LST retrieval?

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Discussion on

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  1. Discussion on Prata et al. 1995: Thermal Remote Sensing of Land Surface Temperature from Satellite: Current Status and Future Prospects.

  2. Which range of wavelength of this paper discuss? • Shortwave? Near Infrared? Thermal Infrared? • What two channels of AVHRR used in LST retrieval? two different wavebands, 10.5-11.5μm and 11.5-12.5 μm (channels 4 and 5 in AVHRR) • Why this range? (p187)

  3. The important effects of____________, ___________and ___________________ are considered and the current practice for removing these effects is specified.

  4. The important effects of the atmosphere, surface emissivity and instrument noise are considered and the current practice for removing these effects is specified.

  5. What can LST be used for? • Calculating SEB (what is 2-way) • In model (what is initialization) • Regional EP estimation • Frost detection • Monitor water-stress in crops • Thermal inertia studies

  6. When LST retrieval started?

  7. retrieval accuracy? • What is LST retrieval accracy? • What is SST retrieval accracy? • What is the logic relation etwee SST retrieval and LST retrieval? • Why LST retrieval is ____ than SST retrieval?

  8. Discuss: “The land surface presented particular problems for temperature determination not evident over the sea” • Surface Emissivity • Making a representative measurement of LST • The validation of satellite LST (Definition and meaning of LST)

  9. Section 2: Definition of Surface Temperature • The ____ channels of AVHH measure the _______ over an area of approximately _______ km2 What is its field of view?, what is its pixel size?

  10. Section 2: Definition of Surface Temperature • After correcting for _____ and _____, the surface temperature inferred is a _______ Representative of the area corresponding to the ____________ of instrument?

  11. Section 2: Definition of Surface Temperature • What is flux definition? • What is the assumption and basis for such a definition? • Why it says “when the surface is not a blackbody, the definition of the radiative surface temperature will depend on the ____, and on the ____”?

  12. Section 2: Definition of Surface Temperature • What is the definition based on planck function?

  13. Section 2: Definition of Surface Temperature • What is the thermodynamic measure of the surface temperature? • What is numerical model used surface temperature?

  14. Section 3 Simple and COmples Land Surface

  15. MODIS Land Cover Classification(M. A. Friedl, A. H. Strahler et al. – Boston University) 0 Water 6 Closed Shrublands 12Croplands 1 Evergreen Needleleaf Forest 7 Open Shrublands 13 Urbanand Built-Up 2 Evergreen BroadleafForest 8 Woody Savannas 14 Cropland/NaturalVeg. Mosaic 3 Deciduous Needleleaf Forest 9 Savannas 15 Snowand Ice 4 Deciduous Broadleaf Forest 10 Grasslands 16 Barren or Sparsely Vegetated 5 Mixed Forests 11 Permanent Wetlands 17 Tundra

  16. (Jin and Dickinson 2010, ERL)

  17. Sec. 4What is Split-window Algorithm? • The general form of the algorithm is Eq. (5) Sobrino et al. notes that in order to gain an LST accracy of ____, the spectral emissivity mst be known to an accuracy of _________

  18. Sec. 4What is Split-window Algorithm? Prate (1994a) was able to show that LST accuracies of _________ is possible. Sobrino et al. notes that in order to gain an LST accracy of ____, the spectral emissivity mst be known to an accuracy of _________ Is this LST accuracy practical?

  19. Section 4:aerosol effect • The aerosol effect in the _____ is ____, and often ____, if compared with the effect in the visible and near infrared regions.

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