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3DMC Reference Guide
Surface File Types
Flat Plane Surface/Sloping Plane Surface:
A planar (flat) surface with a 0% crossslope
and mainfall. This surface is primarily used for
A sloping surface with cross slopes and
mainfall based on a reference elevation.
Crown Surface File
A crown surface file allows the user to define a
centerline and to add a simple cross section
including width and cross slope.
TIN Surface From Topo Survey File:
A TIN surface represents a surface as a
network of non-overlapping triangles. Within
each triangle the surface is represented by a
plane. The triangles are made from a set of
points called mass points.
As-built Surface file:
A color map of the graded surface.