清单5将输出最终图像并计算每个图层颜色值的平均值。
Listing 5 writes out the final image and averages the color values for each layer.
对于给定的大比例尺地图多边形图层数据,该算法可以高效率地完成多边形选取与合并的综合操作,输出小比例尺地图图层数据。
The algorithm based on C Tree can complete the polygon selection and combination operation in high efficiency for given large scale polygon map layer and small output scale.
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