This command can be used to calculate the surface area of a surface in different elevation zone ranges. The program requires 3D Face entities that can be generated by the Plot 3D Grid File or 3D Slice commands. The Draw Triangulation Faces option in Triangulate & Contour can also be used to create triangular 3D Faces. For each elevation zone, the 3D Faces can be hatched with an AutoCAD hatching pattern, solid filled with the SOLID pattern, or left empty with the NONE pattern. The 3D Faces are also placed in a layer for each zone.
There are also options to specify inclusion and exclusion areas.
When inclusion areas are
specified, only the area within the inclusion polyline is calculated.
Areas within an exclusion polyline are
not included in the calculations. Inclusion and exclusion areas are
represented by closed polylines
and must be drawn prior to calling this routine. Without inclusion and
exclusion polylines, all the
area of each selected 3D Face is used.
Name of property represented by Z value <Elevation>: press
Enter
Plot average elevation text in each grid cell (Yes/<No>):
Y
Select 3D Faces to Analyze...
Select objects: pick the
3D Faces to process
Define Ranges (Lowest to Highest) Dialog
Specify the
elevation ranges, colors and patterns.
Select the Inclusion perimeter polylines or ENTER for none:
Select objects: pick a closed polyline for the limits of
disturbed area
Select objects: press Enter
Select the Exclusion perimeter polylines or ENTER for none:
Select objects: press Enter
Select point for color legend
(Enter for none): pick a point
If a point is picked, a legend showing the color of each range is
drawn. The legend is drawn
aligned to the current view UCS. For this reason it is best to
have the mesh at the
Vpoint at which it will be plotted before executing the analysis
program.
A report is also generated in the standard report viewer.
 |
| Result of Elevation Zone Analysis viewed in 3D and shaded |
Pulldown Menu Location: Surface
Keyboard Command: elvzone
Prerequisite: 3D Face entities plotted usually created by the
Make 3D Grid File command.
File Names: \lsp\elanal.lsp, \lsp\contour4.arx