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Path Explorer Dialog
Path Explorer
The Path Explorer tool is an efficient solution designed to dynamically search 3D space for cost-effective horizontal alignments connecting two locations. Using the TIN surface, Path Explorer considers elements such as grade, side slope, vertical offset, and more, ensuring a comprehensive search.
Target TIN surface
This option allows selection of an external terrain file or the current terrain TIN as a target surface.
Source/Destination Coordinate Selection
In this screen, a line feature can be selected whose endpoints will serve as the source and destination coordinates of the path to be computed. The intermediate points of the feature are not used. This defaults to the currently selected feature. Reversing the start and end points of a feature will persist for the lifetime of the application and be reset when opening the application again.
Control allowable approach directions:
This feature allows the configuration of cardinal directions by which the path can leave the source or approach the destination coordinate.
Resolution
Horizontal
Precision at which the search evaluates elements along the horizontal plane.
Vertical
Level of precision (high, medium, or low) used to evaluate elements along the vertical axis. Each option selects an appropriate precision based on other currently selected parameters.
Est. Problem Size
An approximation indicating how complex the problem is. A larger value represents a problem that will take longer to find an optimal solution.
In general:
0-2 small
2-5 medium
5-10 large
10+ very large
General
Number of paths
Desired number of paths. The search will attempt to generate a diverse set of potential paths, given the constraints.
Road width
The desired road width.
Min. Hz. Curvature
Minimum curvature radius allowed.
Construction parameters
These following parameters are related to road construction. For more information about construction zones and how to create custom construction parameters for different regions, as well as no-go zones, See Construction Zone Parameters..
Max. Cut
Maximum cut depth allowed, measured from ground (0 is ground; positive is below ground).
Max. Fill
Maximum fill height allowed, measured from ground (0 is ground; positive is above ground).
Min. Grade (%)
Minimum allowed grade (%), considering direction Source → Destination.
Max. Grade (%)
Maximum allowed grade (%), considering direction Source → Destination.
Cut Cost
Cost per cubic unit of cut material.
Fill Cost
Cost per cubic unit of fill material used.
Surfacing Cost
Cost per square unit of surfacing material.
Cut Slope (%)
The cut slope with which to model cross sections.
Fill Slope (%)
The fill slope with which to model cross sections.
Check feasibility
This runs a fast test to determine if the provided parameters are likely to reach a solution. This can be used as a preliminary validation tool to quickly assess a configuration's feasibility before allocating substantial time to optimize a potentially unsolvable problem.
Reset to defaults
This resets all parameters to their default values.
Remove existing features
If checked, all features with name starting with "EXPLORE_PATH" will be deleted prior to a search.
Warn when out of memory
If checked, warning messages will be displayed when memory conditions are low.
Cross Section
For a better performance, Path Explorer uses trapezoidal approximations of cross sections, as detailed in the figure below. In practice, this simplification represents a small compromise in solution quality in favour of allowing to consider a substantial number of possible paths, at a low computational overhead. The simplified cross sections can be configured in parameters "Road Width" and "Cut/Fill Slope".
