ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations

PhilipOrlando — Mon, 31 Oct 2022 22:44:43 GMT

I am trying to run an ODCM using arcpy.nax and I'm seeing this "Solve did not find a solution" error when running the example code below.

# Solving OD Cost Matrix... # OD Cost Matrix solve failed. # [[-2147200956, 'No "Destinations" found for "Location 1" in "Origins".'], [30212, 'Solve did not find a solution.'], [-2147200971, 'No solution found.']]

import arcpy import os # Check out the NA license or alert error class LicenseError(Exception): pass if arcpy.CheckExtension("Network") == "Available": arcpy.CheckOutExtension("Network") else: raise LicenseError("You need the ArcGIS Network Analyst extension license. Please contact your KP administrator.") try: arcpy.env.overwriteOutput = True # Set environment variables nds = r"path/to/StreetMapPremium/FGDB/StreetMap_Data/NorthAmerica.gdb/Routing/Routing_ND" # <path to your network dataset> gdb = r"path/to/scratch.gdb" # <path to your working geodatabase> in_origins = os.path.join(gdb, "in_org") # nw block group weighted centroids in_destinations = os.path.join(gdb,"in_dest") # nw pc mob locations out_lines = os.path.join(gdb,"od_cost_matrix_lines") nd_travel_modes = arcpy.nax.GetTravelModes(nds) travel_mode = nd_travel_modes["Driving Time"] # Instantiate a solver object odcm = arcpy.nax.OriginDestinationCostMatrix(nds) # Set object properties odcm.travelMode = travel_mode odcm.timeUnits = arcpy.nax.TimeUnits.Minutes # odcm.defaultImpedanceCutoff = 20 # odcm.defaultDestinationCount = 2 odcm.lineShapeType = arcpy.nax.LineShapeType.StraightLine # Load inputs odcm.load( arcpy.nax.OriginDestinationCostMatrixInputDataType.Origins, in_origins) odcm.load( arcpy.nax.OriginDestinationCostMatrixInputDataType.Destinations, in_destinations) # Solve the analysis print("Solving OD Cost Matrix...") result = odcm.solve() # Export the results to a feature class if result.solveSucceeded: print("OD Cost Matrix solve succeeded.") else: print("OD Cost Matrix solve failed.") print(result.solverMessages(arcpy.nax.MessageSeverity.All)) except Exception as e: import sys tb = sys.exc_info()[2] print(f"An error occured on line {tb.tb_lineno}") print(str(e)) # Solving OD Cost Matrix... # OD Cost Matrix solve failed. # [[-2147200956, 'No "Destinations" found for "Location 1" in "Origins".'], [30212, 'Solve did not find a solution.'], [-2147200971, 'No solution found.']]

The origin in question has the following coordinates: 33.492278, -117.247194

The destination in question has the following coordinates: 33.90478, -117.4693

The ODCM solve succeeds when running by hand within ArcGIS Pro, however, this approach is calling arcpy.na methods behind the scenes, instead of arcpy.nax.

arcpy.na.MakeODCostMatrixAnalysisLayer(r"/path/to/StreetMapPremium/FGDB/StreetMap_Data/NorthAmerica.gdb/Routing/Routing_ND", "OD Cost Matrix", "Driving Time", None, None, None, "LOCAL_TIME_AT_LOCATIONS", "STRAIGHT_LINES", None) arcpy.na.AddLocations("OD Cost Matrix", "Origins", "in_org", "Name # #;TargetDestinationCount # #;CurbApproach # 0;Cutoff_Minutes # #;Cutoff_TravelTime # #;Cutoff_Miles # #;Cutoff_Kilometers # #;Cutoff_TimeAt1KPH # #;Cutoff_WalkTime # #;Cutoff_TruckMinutes # #;Cutoff_TruckTravelTime # #", "5000 Meters", None, "Routing_Streets SHAPE;Routing_Streets_Override NONE;Routing_ND_Junctions NONE", "MATCH_TO_CLOSEST", "APPEND", "NO_SNAP", "5 Meters", "EXCLUDE", None) arcpy.na.AddLocations("OD Cost Matrix", "Destinations", "in_dest", "Name # #;CurbApproach # 0", "5000 Meters", None, "Routing_Streets SHAPE;Routing_Streets_Override NONE;Routing_ND_Junctions NONE", "MATCH_TO_CLOSEST", "CLEAR", "NO_SNAP", "5 Meters", "EXCLUDE", None) arcpy.na.Solve("OD Cost Matrix", "SKIP", "TERMINATE", None, '') # Start Time: Monday, October 31, 2022 9:54:53 AM # Succeeded at Monday, October 31, 2022 9:54:54 AM (Elapsed Time: 0.81 seconds)

Can someone from Esri help me understand why the same origins/destinations are returning different results depending on whether arcpy.na or arcpy.nax methods are used? Any insight is appreciated!

Re: ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations

AmlanR — Mon, 31 Oct 2022 23:50:05 GMT

Hi Philip!

Could you provide me with a little more detail on what version of Pro you are using and the SMP data?

I did try it an in-house version of Pro 3.1 and it failed within Pro as well. Upon further inspection, I found that the street on which the origin is located does not allow automobile. Unchecking 'Driving an automobile' in the travel settings resolved the issue.

I would still like to reproduce the issue in-house by replicating your settings and software version.

Re: ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations

PhilipOrlando — Thu, 03 Nov 2022 17:56:40 GMT

@AmlanR, thanks for the info! I'm using ArcGIS Pro 2.7.3 and SMP 2021.3.

I did some more digging yesterday and discovered that the Rounting_ND data that comes with Business Analyst was being selected from within the GUI (instead of SMP). Pointing my ArcPy script to this Routing_ND resulted in a successful ODCM solve.

Is there any other way to handle these points besides unchecking the "Driving an automobile" setting? Ideally, I would like this point to snap to the nearest edge where this is allowed instead of having to alter the travel mode.

topic ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations in ArcGIS Network Analyst Questions

ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations

Re: ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations

Re: ODCM "solve did not find a solution" error with arcpy.nax.solve on valid origins/destinations