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I have a WMTS layer "EMAP15" http://wmts.nlsc.gov.tw/wmts providing footprints as raster layer.

I am trying to create 3D LOD1 buildings in Sketchup, but I have to trace each building as vector lines which takes a lot of time (Showed in image purple lines.)

I tried SaveAs GeoTiff first, then use Polygon (Raster to Vector), which does not get clear result of lines or polygon I wanted.

Any ideas?

Manual Trace building Footprints

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