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Spheroid Degenerated-Octree Grid(SDOG) is a kind of spheroid Global Spatial Grid(GSG),which has nice characteristics in longitude-latitude consistency,orthogonality,quasi-uniform,non-overlapping,multi-hierarchy and multi-resolution,and has potentiality to act as the basic spatial reference framework of Earth System Science(ESS),Global GIS and Digital Earth.However,a huge difference in grid resolution may exist between the radial size and spherical size,which are not easy to be treated by SDOG.This paper developed an adaptable SDOG which can solve that problem well by making a refine subdivision along SDOG's radial direction or spherical direction,respectively.A special space filling curve,named Couple Degenerated Z-curve(CDZ-curve),was designed to fill adaptable SDOG and to realize the grid coding of adaptable SDOG.With global atmospheric temperature provided by NCEP being an example,the adaptable SDOG was experimentally applied for the global 3D spatial modeling of great resolution difference between radial and surface directions.The experiment shows that the adaptable SDOG has better adaptability for Earth System Science,and makes SDOG be qualified to be the basic spatial reference framework of planet Earth.
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