当比例尺条和文本信息叠加置于地图上(比如雪白的图和白色的比例尺文本)时，这个问题尤其突出。
This is particularly a problem with scale bars and textual information overlaid on a map (such as light white snow imagery and white scale text).
绘图员用铅笔、丁字尺、三角板和比例尺在绘图板上绘图。
Draughtsmen make drawing on a drawing board using a pencil and at-square set square and scale.
可以利用已有的基于单一比例尺的GIS数据库中的基础地理数据，通过自动制图综合生成多比例尺数据。
Can utilize the geographical data of foundation in existing GIS database based on single scale, produce mult-scale data synthetically through automatic cartographic generalization.
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