多边形叠加 meaning in English

polygon overlay

Results showed that , attribute data obtained by this way avoided deficiency of polygon overlap way , as a result , the logistical consistency between map data and attribute data reached over 90 % on average . database pivot precision was 0 . 18mm , data quantity during manipulation was decreased greatly , data treatment was more convenient , computation velocity was boosted greatly . workload of map and table pretreatment and edition was mitigated on large scale , spatial data precision was increase
研究表明：用该方法获得的属性数据，避免了多边形叠加方法的不足之处，能使图形数据和属性数据逻辑一致性平均达到90以上，数据库点位精度达到0 . 18mm ，且操作中图层数据量大大减小，数据处理更为方便，运算速度大为提高；减轻了图表预处理和编辑的工作量，使空间数据精度提高。