位置误差主要来源于直接测量的误差、地图数字化的误差遥感数据的误差、数据转换误差、数据输入与存储误差。

The data of GIS include space data and property data. Position errors are mainly from errors of direct measurement, digitalization of map, data input and store.

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光斑尺寸法是数字光盘信息存储中的典型聚焦误差探测方法。

Spot size detection method is representative method to obtain a focus error digital optical disk storage system.

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采用环形数据结构有效存储大规模数据点，通过计算点到平均平面的有限误差距离进行压缩点判别。

It used ring data structure to save massive data effectively. Bounded error-distances from vertices to average plane were computed to find prime vertices for removal.

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