Draw Outcrops generates polylines that represent the outcrops of
strata from the selected drillholes. An outcrop is where a strata
comes up to the surface. An option from the Outcrop Settings dialog
allows the outcrop line to be calculated from where the top of the
strata hits the surface or from where the bottom hits. The Draw
Outcrop Polyline At Elevation will draw the outcrops as 3D
polylines on the surface topography. For example, on a slope, the
top of strata outcrop will be higher than the bottom, and on the
inside when viewed in plan view. When coming from drillholes, Draw
Outcrops calculates the outcrop by creating a grid of the surface
and a grid for the strata and then finding the intersection of the
two grids. If the strata never breaks through the surface, no
outcrop line will be created. The Geologic Model option reads the
surface grid and strata grid from a Geologic Model file (.pre).
This option will show a dialog with a list to choose from of the
strata defined in the Geologic Model file. If the File option is
used, then a Sub-Crop line can be drawn that will prompt for a
thickness grid of the strata. The lines can be smoothed and
vertices reduced with the settings shown below.
The option to Label Outcrop Contours will label the strata name
in the contour line as contour text. The contour text settings
window appears for the desired settings to be entered.
Outcrop Settings
dialog
Select surface entities & at
least 3 drillholes
Select objects: Specify opposite
corner: 43 found
Use drillhole surface elevations
in surface model [Yes/<No>]? N
Reading points ...
3563
Ignored 5 duplicate
points.
Output grids for strata and
surface [Yes/<No>]? n
Choose modeling method
[<Triangulation>/Inversedist/Kriging/Polynomial/LeastSq/ABOS]?
i (or choose another method)
Use inverse distance to which
power [First/<Second>/Third/Other]?
Use elliptical inverse distance
[Yes/<No>]?
Calculating grid by inverse
distances 2601...
Contouring elevation
0.0
Inserted 136 contour
vertices.
Drop-Down Menu Location:
StrataCalc
Keyboard Command: outcrop