How to access Route sublayer properties with ArcPy?

FernandoSanchez2 — Tue, 02 Jul 2013 15:37:03 GMT

After solving a route I need to read the properties of the Route class. Concretely the Total_[Impedance] field as I want to compare different routes with regard to this attribute. Is there any way to do this with ArcPy?

My code until this step is typical:

route_lyr = arcpy.na.MakeRouteLayer(nwork,"BestRoute", "Length", output_path_shape="TRUE_LINES_WITH_MEASURES")
route_lyr = route_lyr.getOutput(0)
sub_layers = arcpy.na.GetNAClassNames(route_lyr)
arcpy.na.AddLocations("BestRoute",sub_layers["Stops"],"stops.shp")
arcpy.na.Solve(route_lyr)

Then I thought about the following to get the Total_Length value of the solve result:

for lyr in arcpy.mapping.ListLayers(route_lyr):
[INDENT]if lyr.name == "Routes":[/INDENT]
[INDENT][INDENT]print lyr.longName ### Printed just for demonstration purposes[/INDENT][/INDENT]
[INDENT][INDENT]with arcpy.da.SearchCursor(lyr.longName, ['Total_Length']) as cursor: [/INDENT][/INDENT]
[INDENT][INDENT][INDENT][INDENT]### "BestRoute\Routes" is passed. [/INDENT]
[/INDENT][/INDENT][/INDENT]
[INDENT][INDENT][INDENT][INDENT]### The error is thrown here[/INDENT][/INDENT][/INDENT][/INDENT]
[INDENT][INDENT][INDENT]for row in cursor:[/INDENT][/INDENT][/INDENT]
[INDENT][INDENT][INDENT][INDENT]cost = row[0][/INDENT][/INDENT][/INDENT][/INDENT]
[INDENT][INDENT][INDENT][INDENT]print cost[/INDENT][/INDENT][/INDENT][/INDENT]

Which prints to standard output:

BestRoute\Routes
An error occurred on line XXX
cannot open 'BestRoute\Routes'

So "BestRoute\Routes" is the long name of the Routes layer but (apparently) not the input that arcpy.da.SearchCursor expects. Generic layer properties (longName, isBroken...) can be accessed with my code, but not those network-related.

I guess I'm missing the mechanism to access the network properties of the sublayer Routes that is stored in the composite layer...

Any help would be much appreciated.

[NOTE: Mistakenly, I posted this question in the Beta Programs forum before. Apologies]

Re: How to access Route sublayer properties with ArcPy?

nicogis — Tue, 02 Jul 2013 17:59:12 GMT

I have tried and I haven't problem (see attach)[ATTACH=CONFIG]25663[/ATTACH]

Re: How to access Route sublayer properties with ArcPy?

FernandoSanchez2 — Thu, 04 Jul 2013 19:31:36 GMT

Thank you ciava.at.

I eventually came up with the following way (changes underlined):

for lyr in arcpy.mapping.ListLayers(route_lyr):
            [INDENT]if lyr.name == "Routes":[/INDENT]
                [INDENT][INDENT]with arcpy.da.SearchCursor(lyr, ['Total_Length']) as cursor:[/INDENT][/INDENT]
                    [INDENT][INDENT][INDENT]for row in cursor:[/INDENT][/INDENT][/INDENT]
                       [INDENT][INDENT][INDENT][INDENT]print row[0][/INDENT][/INDENT][/INDENT][/INDENT]

Which way performs faster, I can't say.

topic How to access Route sublayer properties with ArcPy? in ArcGIS Network Analyst Questions

How to access Route sublayer properties with ArcPy?

Re: How to access Route sublayer properties with ArcPy?

Re: How to access Route sublayer properties with ArcPy?