We take a point on the geometry — the centroid — compute the value for that point on the space filling curve, and store the result in an additional column.
我们在几何图形上取一个点，即形心点，计算那个点在空间填充曲线上的值，并将结果存储在一个附加的列中。
Centroid algorithm is a high accuracy method to locate the point on CCD image. But the large amount of data makes it respond slowly and unsuitable for the real-time digital photogrammetrical system.
重心法是一种高精度的CCD像点位置提取算法，但由于数据量大，响应速度较慢，不适于要求实时响应的数字摄影测量系统。
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