应用长宽系数法测定苎麻叶面积时，需要求出相应的换算系数。
Leaf area measure, as a physiology index, is important for shoot diagnose in field, so the suitable conversion coefficient should be determined for the leaf area measure.
但在低磁纬度地区，作大面积化极换算并进行地质解释的工作仍处于探索阶段。
In area of low magnetic latitude, however, reduction calculation over large data area and geologic interpretation of the resulted data are still in its infancy.
在总结现有的矢量数据向栅格数据转换算法的基础上，提出一种面积误差最小约束下的优化算法。
Based on summarizing the existing algorithms of transferring vector data to raster data, an optimization algorithm is proposed.
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