例如，我们需要在地图图像的顶部构建一条带图像标识符和文本的路线。

For example, we want to build a key at the top of the map image with image identifiers and text.

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本文提供的工具和代码展示了如何使用反转的副本替换现有的地图图像，反转后的图像的南端位于顶部。

This article presents tools and code that show how to replace the map image with an inverted copy, where south is at the top.

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这个技术也许被比作对安置地图叠盖在彼此顶部在一张轻的表格。

This technique may be likened to placing map overlays on top of each other on a light table.

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