Volumes By Layer

Function

This is the easiest yet still equally accurate method for calculating volumes. For this command, volumes are calculated in one step by a simple window of the area, selecting the items, and calculate.

First you must specify the grid location and resolution. The grid location should enclose the area for volume calculations. Next the program asks for the layer names of the entities for the base and final surfaces. These entities, for use in modeling the surfaces, can be points, lines (such as triangulation lines), 2D polylines (such as contours), and 3D polylines (such as breaklines). Inclusion and exclusion perimeters may optionally be specified to limit the volume calculation area on the grid. An inclusion perimeter should be used if there is a closed polyline for the limit of the disturbed area. Then the program internally generates grids of the surfaces from the entities on the corresponding layers and then calculates and reports the volume. The main disadvantage to this routine is that it doesn't have the special output options of Two Surface Volumes such as Depth Contours.

Prompts

Pick Lower Left limit of surface area: pick a point
Pick Upper Right limit of surface area: pick a point to window the entire area
Make Grid File Dialog Choose a grid resolution.
Volumes by Layer Dialog Specify layer names. Click Select Layers to get layers of picked entities on screen.
Select surface entities on corresponding layers.
Select objects: select all the objects on both the EXISTING and FINAL layer sets for the site. In this example, select all entities on the perimeter, ctr, and pnt layers.
Choose Predefined Boundary Dialog Choose none.
Select the Inclusion perimeter polylines or ENTER for none:
Select objects: press Enter
Select the Exclusion perimeter polylines or ENTER for none:
Select objects: press Enter
Reading cell 2500
Extrapolate grid to full grid size [Yes/<No>]? press Enter twice
Volume Report Choose viewing option.

Pulldown Menu Location: Grading
Keyboard Command: layervol
Prerequisite: Entities that define both the base and final surfaces.
File Names: \lsp\layervol.lsp, \lsp\makegrid.arx