Graphics Programs Reference
In-Depth Information
result in a “smoother” profile with fewer
PVIs.
Required Drainage Grade
This is the
minimum grade allowed for the tangent
sections of the profile. Try to set this at
the minimum value possible because if it
is too high, it may prevent the
optimization from finding a solution.
PVI Frequency
This will affect the
“smoothness” as well but is a bit
different from Minimum PVI Spacing.
This is a more general setting that will
affect the distribution of PVIs across the
entire profile.
Anchored PVIs
In addition to the
profile constraints just mentioned, there
may be other considerations that require
the profile to maintain certain elevations
in a given area. This is your opportunity
to “lock down” those areas by choosing
PVIs that are to be preserved during the
optimization. This means that during the
optimization process they will not be
deleted and they will hold their current
station and elevation. For example, you
might lock down PVIs near an existing
road intersection or in front of a building
where you know that the current road
elevations must be preserved. The first
and last PVIs are always anchored and
cannot be changed.
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