屋瓦相互叠盖。
本发明的优点是：可满足复数个印章重叠盖印出全色的图案或文字，而且构造简单。
The present invention has the advantages of capacity of sealing panchromatic pattern and text with several seals and simple structure.
几何图形叠盖是包含几何图形的第一主题图层被叠加形成新主题图层以新的几何图形的空间操作。
Polygon overlay is spatial operation in which a first thematic layer containing polygons is superimposed onto another to form a new thematic layer with new polygons.
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