discussion on
DESCRIPTION
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? - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/1.jpg)
Discussion on
Prata et al. 1995: Thermal Remote Sensing of Land Surface Temperature
from Satellite: Current Status and Future Prospects.
![Page 2: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/2.jpg)
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)
![Page 3: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/3.jpg)
The important effects of____________, ___________and___________________ are considered and the current practice for removing these effects is specified.
![Page 4: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/4.jpg)
The important effects of the atmosphere, surface emissivity and instrument noise are considered and the current practice for removing these effects is specified.
![Page 5: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/5.jpg)
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
![Page 6: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/6.jpg)
When LST retrieval started?
![Page 7: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/7.jpg)
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?
![Page 8: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/8.jpg)
• 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)
![Page 9: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/9.jpg)
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?
![Page 10: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/10.jpg)
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?
![Page 11: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/11.jpg)
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 ____”?
![Page 12: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/12.jpg)
Section 2: Definition of Surface Temperature
• What is the definition based on planck function?
![Page 13: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/13.jpg)
Section 2: Definition of Surface Temperature
• What is the thermodynamic measure of the surface temperature?
• What is numerical model used surface temperature?
![Page 14: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/14.jpg)
Section 3 Simple and COmples Land Surface
![Page 15: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/15.jpg)
MODIS Land Cover Classification(M. A. Friedl, A. H. Strahler et al. – Boston University)
0 Water
1 Evergreen Needleleaf Forest
2 Evergreen Broadleaf Forest3 Deciduous Needleleaf Forest
4 Deciduous Broadleaf Forest
5 Mixed Forests
6 Closed Shrublands7 Open Shrublands
8 Woody Savannas
9 Savannas
10 Grasslands
11 Permanent Wetlands
12 Croplands
13 Urban and Built-Up
14 Cropland/Natural Veg. Mosaic
15 Snow and Ice16 Barren or Sparsely Vegetated
17 Tundra
![Page 16: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/16.jpg)
(Jin and Dickinson 2010, ERL)
![Page 17: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/17.jpg)
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 _________
![Page 18: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/18.jpg)
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?
![Page 19: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/19.jpg)
![Page 20: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/20.jpg)
Section 4:aerosol effect
• The aerosol effect in the _____ is ____, and often ____, if compared with the effect in the visible and near infrared regions.
![Page 21: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/21.jpg)
![Page 22: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/22.jpg)
![Page 23: Discussion on](https://reader035.vdocument.in/reader035/viewer/2022070423/568167f7550346895ddd7366/html5/thumbnails/23.jpg)