使用克里金插值法进行CGCS2000到海南地方坐标系的转换

在工程施工中,通常使用的是地方独立坐标系,各类工程施工图、成果图都要求使用地方平面坐标。如何实现GPS测量坐标到地方坐标的转换,一直是工程施工中的热点问题。本文介绍了从GPS定位坐标至平面坐标的两种转换模型,其中坐标网格法采用格网内插,算法设计简单,计算复杂度低,但精度会受内插网点的影响。在海南岛范围内精度较高,但沿海区域因无差值节点,需将格网外推。克里金内插法计算复杂度较高,但利用变形区域附近的点内插出畸变趋势,转换效果较好。通过对全岛范围约200个静态GPS点位、水准点位的转换结果进行比较,克里金转换算法可以满足一般工程测量的要求。

The Conversion of CGCS2000 Coordinate System to Hainan Local Coordinate System Using Kriging Method

A local independent coordinate system is usually used in the various types of engineering construction plans. The results also require local coordinate system. The Conversion of GPS coordinates to local coordinates has been a hot issue in the measuring project construction. This article describes the two conversion model of GPS coordinates to location coordinates. One is the grid method using grid interpolation algorithm and the other is the Kriging method. The grid method has low computational complexity, and its accuracy is affected by interpolation outlets influence in the range of accuracy in Hainan; Kriging interpolation has higher computational complexity, but the result is better when use of the deformation zone near points interpolated distortion trend. Through the island range of about 200 static GPS points, leveling point conversion results were compared, Kriging conversion algorithm to meet the general requirements of engineering survey.