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Digital Data

The digital data used in the exercise comes from two sources. First, the topography is real digital topography clipped from airborne LiDAR data sets and interpolated on to a grid of the desired size.  Second the structures are idealized shapes in which each point in the 3D rectangular volume is assigned a number corresponding to rock type. All points in the volume that have the same number are assigned the same color from a color palette file, and so these appear as layers or blocks. Finally in order to show how the structure would be exposed on the topographic surface, we calculate a volume of “height” above/below the topographic surface. This volume is the same size and has the same mesh spacing as the structure volumes. Using 3Dvisualizer we can then choose an iso-surface of topographic height and color that surface using the value of the structure volume on that surface and the color palette.

  Archives
  Structure Volume (SV) Anticline Syncline Fold Dipping
Anticline
Dipping
Syncline
Dipping
Fold
SV-ALL
  Structure Volume (SV)
  rotated-90°
      Dipping
Anticline
Dipping
Syncline
Dipping
Fold
Matlab Scripts
  Original DEM A B C       DEMs
  Topography Height Volume A B C       Volume Data
  Topography Height Volume             Matlab Scripts
  Rule of Vs             ALL
  Rule of Vs             Matlab Scripts

All of the volume data was made using Matlab and exported to a format that 3DVisualizer uses. In matlab the data is held as 3D volumetric grids that can be accessed by the index in each direction (i,j,k). For 3DVisualizer we output two files for each volume: the grid coordinates and the value at each grid point. The data in both of these files starts in the bottom, front, left side of the box. It then increases in the left-to-right direction (X), then the front-to-back direction (Y) and then the top-to-bottom direction (Z).

Grid size
Important Note: in order to view the topography and the structure together in 3DVisualizer they must be on a grid of the same size (same number of mesh points in all three directions).

Volumes (Structures and Topographic Height)

Original Topography Surface (2D)