VTB: fix road-elevation flattening to ignore roads that are partly off the grid.
VTB: fix road-elevation flattening to ignore roads that are partly off the grid.
markraz/vtp,seanisom/vtp,markraz/vtp,markraz/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp,markraz/vtp,seanisom/vtp