... 大地基准变换 datum shift 基准球面 datum sphere 基准转换 datum transformation ...
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virtual sphere center datum 虚拟球心基准
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Both geographic and projected coordinate systems include a definition of the assumed shape of the earth (a flattened sphere); this is called the geodetic datum.
地理和投影坐标系都包含对地球形状的假设(一个略扁的球体)；这称为大地基准点。
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