A two-dimensional position fix that includes only horizontal coordinates. It requires a minimum of three visible satellites.
二维定位模式，只有平面的座标。必需至少取得三个卫星的资料。
The baseline vectors are solved with software GAMIT and the space coordinates determined with 3-d adjustment model. Horizontal coordinates are adjusted under different conditions.
基线由GAMIT软件解算，利用空间平差模型进行了三维坐标平差，平面平差则在不同的条件下进行。
X coordinates: The X coordinate is a point's horizontal distance from the origin.
X 坐标：X 坐标是某一个点距离原点的水平距离。
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