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Discrepancy Between ASTER- and MODIS- Derived Land Surface Temperatures: Terrain Effects.

Yuanbo Liu1, Yousuke Noumi, Yasushi Yamaguchi

  • 1Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China.

Sensors (Basel, Switzerland)
|March 9, 2012
PubMed
Summary

Terrain effects on land surface temperature (LST) retrievals from MODIS and ASTER satellites were examined. While not major, terrain significantly impacts LST discrepancies, with radiance angle being more critical than slope.

Keywords:
ASTERLand surface temperatureMODISsurface emissivityterrain effects

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Area of Science:

  • Earth Observation
  • Remote Sensing
  • Geophysics

Background:

  • MODerate resolution Imaging Spectroradiometer (MODIS) and Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) provide global land surface temperature (LST) data.
  • Mountainous regions present challenges for LST retrieval due to elevation, slope, and aspect variations.
  • Terrain-induced biases are often overlooked in satellite LST products, potentially causing discrepancies between sensors like MODIS and ASTER.

Purpose of the Study:

  • To investigate the impact of terrain effects on land surface temperature (LST) discrepancies between MODIS and ASTER.
  • To analyze the influence of elevation, slope, and aspect on LST retrieval biases in mountainous areas.
  • To evaluate the suitability of conventional terrain corrections for LST products.

Main Methods:

  • Comparative analysis of MODIS and ASTER LST products over a relief area in China's Loess Plateau.
  • Examination of terrain parameters (elevation, slope, aspect) and their correlation with LST differences.
  • Assessment of emissivity variations between ASTER and MODIS to infer terrain correction methods.

Main Results:

  • Terrain-induced effects were found to be important, though not the primary driver, of LST discrepancies between MODIS and ASTER.
  • The angle of emitted radiance played a more significant role in LST discrepancy than the local slope angle.
  • Conventional terrain corrections may be inadequate for densely vegetated areas, as suggested by emissivity distribution analysis.

Conclusions:

  • Terrain influences satellite-derived LST, necessitating careful consideration in complex topography.
  • The angle of emitted radiance is a critical factor in understanding LST discrepancies.
  • Further research on classification-induced emissivity uncertainty is crucial for accurate LST retrieval in relief areas.