I'm using LiDAR in QT Modeler to create contour lines and my goal is to use a polygon buffer of roads I created to only select the DEM area in the buffer. I tried configuring the buffer a few different ways to no avail. The closest I have come was through using the buffer so it was dissolved to create a single polygon but a perimeter boundary was created. The first image shows the perimeter created using the outermost roads. The second image shows what the road buffer looks like (and ideally what I would like the selection area in QT Modeler to look like). Any help would be greatly appreciated.
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