Elevate Lot Edges by Grade Rules

Elevating lot edges is useful to establish final grading for subdivisions or selected lot boundaries, and is also used in the Road Network routines by linking to the grade rule file. Once this final grade is established (by executing Triangulate and Contour selecting the elevated 3D lot lines as source objects), there are options to balance cut and fill by adjusting the lot lines' elevations based on the settings established in the grade rules (.grr) file. The initial elevation of lot lines will apply the normal slope, and the balancing routines will only adjust within the limits established by the minimum and maximum slope settings in the .grr file.

Consider the following example: you have a small subdivision with lot lines established using LotNET or other routine, and wish to elevate them with respect to the edge of the proposed roadway. Initially, the lot lines are at zero elevation. In this example, you will use the back edge of the sidewalk that is established as part of the roadway cross section template that creates all linework, at proposed grade based on the design profile of the roadway, and you wish to maintain this edge of walk at its design elevations.

Small Subdivision Design with Roads and Lots
Detail of roadway and lot edges

Execute the routine, and you will be prompted for some initial information:

Specify the distance away from the reference grade line to seek the front lot lines to elevate and establish the layer to place the elevated lot lines on. This retains the original 2D zero-elevation lot lines to use in annotation, etc. on their original layers.

Prompts

Select reference elevation polylines.
Select objects: select reference 3D polyline with elevations
Select lot linework to elevate.
Select objects: select lot lines to elevate, including side lines and rear lines
Loading edges...
Loaded 826 points and 2250 edges
Created 1425 triangles
Elevated 18 lot edges.
Front, side and back lot lines elevated

Pulldown Menu Location: 3D Data >> Elevate By Grade Rules
Keyboard Command: elevate_lots
Prerequisite: 3D reference grade line, lot lines to elevate