这里描述的KML仅为美国就使用了数以千计的多边形顶点，因此如果要在全球呈现或超越国家级的精确度，则可能需要速度更快的处理器。

The KML described herein USES tens of thousands of polygon vertices for the United States alone, so faster processors may be required for global rendering or precision beyond the state level.

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但它的速度太慢，使用它创建快速多边形填充物。

But it was too slow to create fast polygon fillers with it.

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采用矢量与栅格结合的技术进行更新，简化了矢量多边形叠交运算，实现了图斑内部的局部矢量化，提高了处理速度。

And the integrating raster with vector technology predigests the polygon overlaying operation, realizes inner span part vectorizing and speed up the process.

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