sorry, didn't see the original attachment. when I looked at it, the ends of the curve you where patching to weren't actually coincident to the edges of the surface/projected lines. which is why you couldn't patch, you didn't have a closed loop. may still be the pr...
After importing the previously downloaded .stl file into Fusion 360, I moved the mesh to the location I wanted by first clicking on "move to ground" button in the pop-up. This aligns the bottom surface of the mesh with the base plane that the map boundary is on. Next, use the arrows...