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International  Mass Loading Service: loading type
   -  Total mass — the displacement is computed with respect 
        to the center of the total Earth's mass, including the mass of the 
        fluid (atmosphere or water).
        
   
-  Solid mass — the displacement is computed with respect 
        to the center of the solid Earth's mass, excluding the mass of the 
        fluid (atmosphere or water).
        
   
-  Degree 1 term only — incomplete loading displacement
        that accounts only for the contribution of the degree-1 spherical 
        harmonics to loading displacement: the difference in displacements 
        with respect to the center of the solid Earth mass and the center 
        of the total Earth mass. This displacement is equivalent to the 
        displacement of the center of the solid Earth with respect to the
        center of the total Earth with the opposite sign.
        When this displacement is added to the displacement computed with 
        respect to the center of mass of the total Earth including the 
        mass of the atmosphere, the sum becomes the displacement with 
        respect to the center of mass of the solid Earth, excluding 
        the atmosphere.
        
  It should be noted that the difference in displacements with respect to
different origins is not small.
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Responsible NASA official:  Leonid Petrov 
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Responsible NASA official:  Leonid Petrov 
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 Privacy Policy and 
important notices
Last update: 2024.06.07_10:46:02