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I have 20,000 polylines in a .gdb that represent about 5,000 building footprints. Some of the building footprints have pretty substantial gaps (image below). I would like to snap the polylines closed into polygons so that I can extrude the buildings.

Can this be done in GRASS?

building footprints

I am hoping that there is something in the open source community with a "Clean" or some such functionality.

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In GRASS GIS, you can use v.edit's snap tool.

snap: Snap vector features in given threshold

There are options to snap to a node or a vertex.

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