To close open line geometries into polygonal areas, which transformer would you use?

• A. LineBuilder
• B. AreaBuilder
• C. Bufferer
• D. Clipper

Answer: (B)

Closing open line work into polygonal areas is about turning line boundaries into filled surfaces. AreaBuilder is designed for this exact task: it takes line features and constructs polygonal areas by closing gaps and forming the interior of the lines, producing polygons from the input linework.

LineBuilder, by contrast, builds lines from coordinates and doesn’t create polygons from existing line networks. Bufferer creates polygons by buffering geometry at a specified distance, not by closing lines into areas. Clipper performs clipping, cutting one geometry by another, rather than converting open lines into enclosed polygons.