Based on common raster display, some key techniques for the software simulation method, such as afterglow model and meta-graph switch model, are discussed in detail.

以普通光栅显示器为基础，研究了余辉模型、图形元变换模型等软模拟的关键实现技术。

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The paper proposes a method of measuring wave length of light wave by using minimum deviation angle based on raster.

本文通过光栅衍射给出了用最小偏向角测光波波长的方法。

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Putting forward the change statistic method based on acreage, and counting the varieties of vector map data by using polygon intersection of vector data and changed pixel of raster data.

提出基于面积的变化统计方法，分别利用矢量数据的多边形交集和栅格数据的变化像素来统计地图矢量数据的变化。

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