The algorithm of transferring vector polygon to raster data is one of the basic algorithms of GIS.
矢量多边形的栅格化算法是地理信息系统的基础算法之一。
For the sake of realizing some special functions in spatial analysis of GIS, it is necessary to covert irregular vector polygon into regular grid.
在实际的GIS空间分析过程中，为了更加简便快捷的实现某些特定的空间分析功能，常常需要将不规则的矢量多边形区域转化为规则的格网区域。
At the same time the author points out that the polygon vertexes can be sorted clockwise or anticlockwise by judging the sign of the vector polygon area.
同时指出可以通过判断矢量多边形面积的正负值将多边形的顶点按照顺时针或逆时针方向排序。
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