field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField not applying

HarrySmiles — Mon, 23 May 2022 02:45:38 GMT

I am trying to generate a number of service profiles using the arcpy nax network analyst library. The idea is to create a profile for each of the models (impedance values) we use, and also some standard cut off times that we use.

The script appears to work but does not apply either the Additional Time mapped field name, or the default value. In the output facilities layer the value for all locations is 0.

I've made sure that the value in the turnout field is a double.

Any ideas what the issue could be.

Thanks

import arcpy arcpy.CheckOutExtension("network") roadNetwork = r"C:\aaa\rnm\2022_04.gdb\Core_VG2020\RoutingApplication_ND" nd_layer_name = "Routing_ND" #inFacilities = r"J:\projects\netmodels\04 Data\Turnout Times\FY2122_Q3\data.gdb\FY2022_Q3_Brigades_w_TOT" inFacilities = r"C:\aaa\rnm\Statewide_Profiles\Resp_Profiles_2022_04.gdb\inside" turnoutTimeField = "turnout" additional_fields = ['turnout_id', 'short_name', 'brig_name', 'brig_no', 'distrct_no', 'turnout_mins', turnoutTimeField] toolOutput = r"C:\aaa\rnm\Statewide_Profiles\Resp_Profiles_2022_04.gdb" outputName = "Resp_Profiles_2022_041" models = ['ARRB_Min', 'ARRB_Mean', 'ARRB_Max', 'EmergencyServicesTime', 'GLM_Pumper_Off_Peak', 'GLM_Pumper_Peak', 'GLM_Tanker_Off_Peak', 'GLM_Tanker_Peak'] breakValues = [8, 10, 20] travel_mode_name = "CFA" # Create a network dataset layer and get the desired travel mode for analysis arcpy.nax.MakeNetworkDatasetLayer(roadNetwork, nd_layer_name) nd_travel_modes = arcpy.nax.GetTravelModes(nd_layer_name) travel_mode = nd_travel_modes["CFA"] service_area = arcpy.nax.ServiceArea(nd_layer_name) # Set properties service_area.outputType = arcpy.nax.ServiceAreaOutputType.Polygons service_area.geometryAtOverlap = arcpy.nax.ServiceAreaOverlapGeometry.Overlap service_area.polygonDetail = arcpy.nax.ServiceAreaPolygonDetail.Standard additional_fields_objects = [f for f in arcpy.ListFields(inFacilities) if f.name in additional_fields] field_mappings = service_area.fieldMappings(arcpy.nax.ServiceAreaInputDataType.Facilities, list_candidate_fields=additional_fields_objects) field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField field_mappings["AdditionalTime"] = 6.0 service_area.load(arcpy.nax.ServiceAreaInputDataType.Facilities, inFacilities, field_mappings) for model in models: travel_mode.impedance = model travel_mode.timeAttributeName = model service_area.travelMode = travel_mode for cutoff in breakValues: service_area.defaultImpedanceCutoffs = cutoff result = service_area.solve() if result.solveSucceeded: output_fc = f"{toolOutput}\\{outputName}_{model}_{cutoff}" result.export(arcpy.nax.ServiceAreaOutputDataType.Polygons, output_fc) result.export(arcpy.nax.ServiceAreaOutputDataType.Facilities, output_fc + "_fac") else: print("Solve failed") print(result.solverMessages(arcpy.nax.MessageSeverity.All))

Re: field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField not applying

Anonymous User — Sat, 28 May 2022 03:46:46 GMT

Just guessing here for now, but I don’t think it likes the .notation. There’s no error, but no change either. I’ve found that field mappings work better if the whole fieldmap object is pulled out, modified, then reassigned.

field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField

Assign the field_mappings[‘AdditionalTime’] to a variable, change the ‘mappedFieldName’ property there, and reassign it back to field_mappings[‘AdditionalTime’]

tmp = field_mappings[‘AdditionalTime’]
tmp[‘MappedFld…’] = turnoutTimeField
field_mappings[‘AddititonalTime’] = tmp

topic field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField not applying in Python Questions

field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField not applying

Re: field_mappings["AdditionalTime"].mappedFieldName = turnoutTimeField not applying