Your assesement about the temp grading surface is correct. Good job.
Now to explain:
My intent was to control the grading of the parking by creating a baseline
alignment, profile it, create a feature line from the alignment and profile
and use it to create a grading for a drape surface for the pavement and pad.
By draping the pavement and pad edge onto this temp surface I can control
the grading entirely by the profile and temp grading object. Any changes to
the grading would simply entail re-draping the pavement and pad lines onto
the temp surface. To pick up the fine details of the profile such as high
and low points, I need to drape the feature lines with intermediate
vertices. If I omit the intermdiate vertices when draping, I will have to
manually apply the key grading points to the pavement and pad lines which in
effect negates the main advantage to using the temp surface. This technique
for grading can be very efficient. It is a shame that the software doesn't
handle it well.
Secondly, the reason the pavement lines are in several pieces is to
accomodate different types of curb. In some places high back/vertical curb
is required and ribbon curb in others. I felt it would be most efficient to
use seperate feature lines and rapidly apply the appropriate curb grading to
them. To try to model those variations from a single feature line would be
tedious. Again the software does not accomodate this scenario all that well.
Your suggestion to work from back of curb inward is a good one. It would
provide precise elevations at the key points for staking and minimize the
filleting effects of the gradings. However, to be manageable it would also
require breaking the feature line into pieces to accomodate the various curb
types. Still it may prevent some of the overlap issues as well since the
gradings would tend to contract rather than expand and encroach on each
other. I might give it a try.
Thank you for your assesment on this. It demonstrates the value of
experience over book knowlege.
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