Step 1:  Select pointnode for start of path.
 

Step 2: With right mouse button, select Shortest Path.
 

Step 3: Click Go.
 

Step 4: Select pointnode for end of path.
 

    Note that the length of the path is displayed in the bottom status box.

    If you want to find the shortest path between the same starting pointnode and another ending pointnode, there is no need to repeat all the steps.  Just repeat step 4.

    Although the example above uses the Roads & Trails theme, since that is where this mode is most useful, Shortest Path mode is supported for all themes.  The starting pointnode determines the theme; the ending pointnode must be in the same theme, and all lines followed by the path will likewise be in that theme.  (Thus, if you start in the Roads & Trails theme, it will not be suggested that you take a shortcut along a stream, power transmission line, or town boundary.)
 
 

Handling underpasses and overpasses

    Shortest path mode recognizes underpasses and overpasses.  If the pointnode you select for the start of path has an underpass and/or overpass, you may choose it in Step 3 by holding the appropriate Shift key when you press Go.  For underpasses use the left Shift key; for overpasses use the right Shift key.

    Similarly, if the pointnode you desire for the end of path has an underpass and/or overpass, you may choose either in Step 4 by holding the appropriate Shift key as you move the mouse to select the pointnode.  Again, for underpasses use the left Shift key; for overpasses use the right Shift key.

A Reminder

    Shortest Path mode finds the shortest path along the lines in the map.  While it is hoped that this line will represent the shortest path along the real world objects that those lines represent, that will not always be the case.  For instance, although underpasses and overpasses are recognized (and so following the real world path should not require jumping off any bridges), other information such as one-way streets are not stored in SDTS files.  Remember that the shortest path suggested is just that: a suggestion.  Naturally, you will need to add your own knowledge of the real world before heading out on the trail.

Limitations

    Currently, Shortest Path mode will only seek out the shortest path along lines in a single surface.  The pointnodes for the start of path and the end of path must be on the same surface.  Also, the shortest path shown will always stay within that surface, even though a better path might exist by following a path that strays into an adjoining surface.

Copyright © 2002 by Dapper Mapper