2.0

Table Of Contents

Calculating Volume Data for a Grading Object

NOTE

After you create the breaklines, you must build the surface to incorporate

the breakline data into that surface.

Calculating Volume Data for a Grading Object

You can use the Calculate Volume command to calculate the cut, fill, and net

volumes of a grading object. The composite volume method is used to calculate

the volume results. This method compares the grading object with the grading

target(s) to determine the volumes.

When you calculate volumes for the grading object, the program creates a

temporary DTM of the grading object in memory, and compares it with the

target surface. The comparison method used is similar to the composite

volume calculation method. The target is treated as existing ground and the

grading object is treated as finished ground for the purposes of calculating

volumes. In order to calculate volumes for a grading object, the grading

target(s) of the grading object must be an existing terrain model surface or an

absolute elevation.

If the grading object you created does not meet certain requirements, then the

Calculate Volume command and the Statistics property page cannot generate

volumes. In this instance, or if you want to verify volume calculations, you can

create a surface from the grading object (and add surface information to the

interior of the footprint, such as points, contours, or 3D polylines if needed),

and then use the Volume commands on the Terrain menu to calculate volumes.

Volumes are only calculated under the following conditions:

If the target is a surface and the grading direction is to the outside of a closed

footprint (volumes will be calculated between the object and the surface).

If the target is an absolute elevation (volumes will be calculated between the

object and the elevation).

Volumes are not calculated under the following conditions:

If the grading object has multiple targets.

If the grading object has a single relative elevation target.

If the footprint is closed and graded to the inside using a surface target.

If the daylight line(s) cross and the condition is detected by the program.

NOTE

Calculating statistics may require a moderate amount of processing time.

NOTE

Volumes may not be accurate if a daylight line(s) cross within the object.

In most circumstances, the program will detect this condition, and no

volumes will be calculated.