Because most designs and topographic maps are prepared using
computer-aided drafting techniques, we use several
software packages to rapidly extract and evaluate the
data. Details of the process are as follows.
- base maps provided or developed in AutoCad.
- files imported to MapInfo using in-house code.
- vertices added using another in-house routine.
- x, y, and z extracted using VerticalMapper.
- data gridded using VerticalMapper.
- new grid files of the differences between the surfaces
generated using VerticalMapper.
- difference grids contoured & the volume represented by the area
of the contour region determined using an in-house developed code.
Examples of the kinds of volumes that can be calculated are:
- final cover to base of excavation (total site capacity);
- current topography to base of excavation (volume consumed
- current topography to last year's topography (volume consumed
during the period); and
- final cover to current topography (volume remaining).
If the limits are carefully chosen, sub-areas of these grids can be used to
estimate the volume of soil remaining to be excavated or the
volume available in existing stockpiles.