2011

data field or a field in a linked external database. You then set the Link Direct
Resistance property to an expression that uses this speed limit data, for
example:
(/ .length (* :speed@street_data 5280))
which divides the length of each link by the average speed per foot (where
5280 is the number of feet in a mile).
The resulting analysis shows the best route, in terms of time, not distance.
Object Data Stored for a Best Route Topology
If you save the results of a best route analysis to a new topology, AutoCAD
Map 3D adds topology information, stored as object data, on each element
that makes up the best route topology. The object data table contains
information about the order of the links visited and the resistance used to
calculate the best route. The object data table added is like the one shown in
the following table.
Object Data FieldObject Data TableTopology Name
Path Link Visit OrderBR_SAMPLESAMPLE
Evaluated Link Forward Resistance
Evaluated Link Reverse Resistance
Evaluated Start Node Resistance
Evaluated End Node Resistance
Evaluated Link Direction
Displaying Visit Order Using Annotation
To display the order in which to visit points, you use AutoCAD Map 3D's
annotation feature to label the best route with the object data described above.
Editing a Best Route Topology
If you change the direction or resistance of an object in a best route topology,
the best route shown may no longer be the optimal route, and you should
recalculate the best route. For example, if you change the direction of a link
from bi-directional to forward or reverse, it may change the best route.
Performing a Best Route Analysis | 1329