Check list

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Sometimes a calculation returns a different result (route) compared to what you expected or you get no route at all (error code -33 / -38). Both situations are due to issues somewhere in the network and these can be hard to locate.

This is a list of things to check:

·	Look inside network_report.txt (generated when calling NWcreate):

1.	Are you using the latest version of RW Net?

2.	Is the coordinate unit correct?

3.	Should Z-level information have been applied?

4.	Do some of the objects have errors?

5.	Is the average object length reasonable?

·	Check for network errors. See also data sources.

·	Do you create and load your network in the correct order? See flowchart.

·	Do you check the return code from all function calls?

·	Reduce the setup as much as possible:

1.	Call Attributeload(false) (removes oneway restrictions) or

2.	Skip calling Attributeload (removes oneway restrictions and mode restrictions)

3.	Set Turnmode = false

4.	Set Hierarchy = false

5.	Skip Limits

6.	Use SetShortest instead of SetFastest

7.	Set Alpha = 0

If this solved the problem, enable these again one by one, until it fails. Then you know where to look.

·	Create maps in your GIS identifying the problem:

1.	Look at basic map for no physical connection (missing bridge / ferry etc)

2.	Create a thematic map of one-way directions and closed links

3.	Create a thematic map of attribute field

4.	Create a thematic map of hierarchy attributes etc.

5.	Call TurnExport2_GIS to view turn restrictions

6.	Call FindCloseNodes from RW Net Pro

7.	Call NodeLinkCheck from RW Net Pro.

8.	Call SubNet from RW Net Pro

9.	If you don't have RW Net Pro version, try Isolink2 with a large stepsadd() value

If you have multiple points (TSP functions or RouteList with >2 points), it can be tricky to locate which point makes the trouble. One way is to calculate with 2 points first. If that works OK, try with 3 points, then 4 points etc, until the problem pops up. Now the problem is usually somewhere near the last point being added.