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Under the Surface: Creating Accurate Surfaces in Civil 3D

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Understand how to make a surface in Civil 3D. Understand the theory behind making a surface in ... Look for Flat Areas, or where Triangles edges need to be Swapped ... – PowerPoint PPT presentation

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Title: Under the Surface: Creating Accurate Surfaces in Civil 3D


1
Under the Surface Creating Accurate Surfaces in
Civil 3D
Scott Wagner, P.E. Business Development Manager
2
Introduction
  • Who am I?
  • Why this is important to me?
  • Poll
  • Handouts/Questions
  • Objectives

3
Objectives
  • Understand how to make a surface in Civil 3D
  • Understand the theory behind making a surface in
    Civil 3D
  • Understand how to perform surface edits
  • Understand how to apply surface masks
  • Understand an overall strategy on how to create
    an accurate surface.

4
Agenda
  • Differences between Land Desktop Surfaces and
    Civil 3D Surfaces
  • Create a Surface from Point Group
  • Types of Surfaces
  • Create a Surface from Contours, Point Files DEM
  • Surface Evaluation Process

5
Under the Surface Land Desktop vs. Civil 3D
  • Ill Race You.And Ill Win!

6
Under the Surface Land Desktop vs. Civil 3D
  • Land Desktop 2007 Demonstration

7
Under the Surface Create a Surface from Point
Groups
  • Creating and Viewing Surfaces in Civil 3D

8
Under the Surface Create a Surface from Point
Groups
  • Civil 3D 2007 Demonstration

9
Under the Surface Types of Surfaces
  • Tin Surface, Grid Surface and Volume Surfaces

10
TIN Surface The Most Common Surface Type
  • TIN surfaces provide an accurate surface model
    that is widely used.
  • TIN Surface-
  • Triangular Irregular Network. A TIN surface is
    the most common method of interpolating elevation
    data. The points are connected into triangles
    that are used to interpolate for contours, and to
    generate profiles and cross-sections. The lines
    that make up the surface triangulation are called
    TIN lines. (Civil 3D Help)

543.5
543.5
542.0
542.5
11
Grid Surface The Other Method
  • Grid surfaces provide an accurate surface model
    that is largely used with DEM files.
  • Grid Surface-
  • A type of surface created from a DEM or SDTS
    file, or imported from a LandXML file. A grid
    surface consists of a sampled array of elevations
    for a number of ground positions at regularly
    spaced intervals. (Civil 3D Help)
  • It is a grid spaced surface in which each
    regularly spaced cell is assigned a single
    elevation. (Autodesk Education Curriculum for
    Civil 3D 2006)

12
Volume Surface The Surface needed to do Volume
Calculations
  • Volume Surfaces can either be TIN or Grid.
  • TIN Volume Surface-
  • A differential surface created from a composite
    of points based on base and comparison surface.
    (Civil 3D Help)
  • Grid Volume Surface-
  • A differential grid surface based on
    user-specified base and comparison surfaces. The
    grid method of volume calculation measures the
    difference in elevation between two surfaces at
    each intersection in a user-defined grid.
  • (Civil 3D Help)

13
Under the Surface Create a Surface from
Contours, Point Files, and DEM Files
  • Time to go Deeper

14
Under the Surface Create a Surface from
Contours
  • Civil 3D 2007 Demonstration

15
Under the Surface Create a Surface from a
Point File
  • Civil 3D 2007 Demonstration

16
Under the Surface Create a Surface from a
DEM File
  • Civil 3D 2007 Demonstration

17
Under the Surface Surface Evaluation Process
  • A good process yields good results.

18
Surface Evaluation Process
  • Create the Surface
  • With TIN lines on, View the Surface in 3D to look
    for Spikes
  • Use Contours, Flow Arrows and Gradients to Verify
    Slopes
  • Look at Boundary Conditions Add boundaries
    where Needed
  • Look for Areas where Breaklines can be Added

19
Surface Evaluation Process (cont.)
  • Look for Flat Areas, or where Triangles edges
    need to be Swapped
  • Apply Masks for Better Performance
  • Peer Review
  • Export to Land XML for Archive of Finished, Ready
    to use Surface

20
Conclusion
  • Differences between Land Desktop Surfaces and
    Civil 3D Surfaces
  • Create a Surface from Point Group
  • Types of Surfaces
  • Create a Surface from Contours, Point Files DEM
  • Surface Evaluation Process

21
Contact Information Scott Wagner, P.E.
  • E-mail Address
  • scott.wagner_at_ideateinc.com
  • Ideate Website Address
  • www.ideateinc.com
  • Additional Civil 3D Webcasts
  • www.ideateinc.com/ideas/webcasts.html

22
(No Transcript)
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