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I am able to run Geometric Network Trace by using following ArcPy script but I also need to add Trace result into the map. Can you please let me know how I can add the result(graphic/geometry) to the map.

import arcpy

arcpy.env.workspace = r"E:/Utility/Sample/Montgomery.gdb"
# Local variables:
G_N = "E:/Utility/Sample/Montgomery.gdb/Water/Water_Net"
Flag = "E:/Utility/Sample/Flag.shp"
traceOut = "traceOut_Net"

# Process: Trace Geometric Network
arcpy.TraceGeometricNetwork_management(G_N, traceOut, Flag, "TRACE_UPSTREAM", "", "", "", "", "", "NO_TRACE_ENDS", "", "", "", "AS_IS", "", "", "", "AS_IS")
print "Trace Done"
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  • My recollection is that if you run the tool it outputs a group layer into your map. You may need to make your script run in foreground for it to work.
    – Midavalo
    May 18, 2017 at 18:06
  • I'm fairly sure this has been asked before, in the last few months. I'll see if I can find a duplicate
    – Midavalo
    May 18, 2017 at 18:09
  • Thanks Midavalo but that code just add the futures into the gdb . It is not adding them into the map!
    – Suffii
    May 18, 2017 at 19:09
  • Are you running the script from ArcMap with background-geoprocessing disabled for the script?
    – Midavalo
    May 20, 2017 at 2:52

2 Answers 2

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If running the script in foreground doesn't automatically add the output layer to your MXD, try using arcpy.mapping.AddLayer() to insert the layer into ArcMap:

import arcpy

arcpy.env.workspace = r"E:/Utility/Sample/Montgomery.gdb"
mxd = arcpy.mapping.MapDocument(r"CURRENT")
df = mxd.activeDataFrame

# Local variables:
G_N = "E:/Utility/Sample/Montgomery.gdb/Water/Water_Net"
Flag = "E:/Utility/Sample/Flag.shp"
traceOut = "traceOut_Net"

# Process: Trace Geometric Network
arcpy.TraceGeometricNetwork_management(G_N, traceOut, Flag, "TRACE_UPSTREAM", "", "", "", "", "", "NO_TRACE_ENDS", "", "", "", "AS_IS", "", "", "", "AS_IS")
print "Trace Done"

arcpy.mapping.AddLayer(df, traceOut, "AUTO_ARRANGE")
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you can also define a Feature class and fill it after ending of trace and use MakeFeatureLayer to craete Layer

arcpy.env.workspace = r"E:/Utility/Sample/Montgomery.gdb"
G_N = "E:/Utility/Sample/Montgomery.gdb/Water/Water_Net"
Flag = "E:/Utility/Sample/Flag.shp"
traceOut = "traceOut_Net"

# Process: Trace Geometric Network
arcpy.TraceGeometricNetwork_management(G_N, traceOut, Flag, "TRACE_UPSTREAM", "", "", "", "", "", "NO_TRACE_ENDS", "", "", "", "AS_IS", "", "", "", "AS_IS")
spatial_reference = arcpy.SpatialReference('Projected Coordinate Systems/World/WGS 1984 Web Mercator (auxiliary sphere)')
FC = arcpy.CreateFeatureclass_management("in_memory","Q234","POLYLINE","","DISABLED","DISABLED",spatial_reference)

add proper filed to FeatureClass

 FC = arcpy.CreateFeatureclass_management("in_memory","MyLines","POINT","","DISABLED","DISABLED",spatial_reference)
for FeatureClass in FC:
    arcpy.AddField_management(FeatureClass, "TableName", "TEXT", "", "", "80", "", "NULLABLE", "NON_REQUIRED", "")
    arcpy.AddField_management(FeatureClass, "Obj_ID", "TEXT", "", "", "80", "", "NULLABLE", "NON_REQUIRED", "")
    arcpy.AddField_management(FeatureClass, "GeoJson", "TEXT", "", "", "880", "", "NULLABLE", "NON_REQUIRED", "")
    arcpy.AddField_management(FeatureClass, "LayerId", "TEXT", "", "", "80", "", "NULLABLE", "NON_REQUIRED", "")
    arcpy.AddField_management(FeatureClass, "LayerName", "TEXT", "", "", "80", "", "NULLABLE", "NON_REQUIRED", "")

do a loop on result of trace then fill FeatureClass with values

for sublayer in traceOut :
   layername=sublayer.name
   ld=arcpy.Describe(sublayer)
   layeraliasname=ld.aliasname
   numbeeLayerId=numbeeLayerId+1;
   if arcpy.Describe(sublayer).shapeType=="Point":
      with arcpy.da.SearchCursor(sublayer,("OBJECTID","SHAPE@","SHAPE@JSON"),"",spatial_reference=spatial_reference)as cursora:
           with arcpy.da.InsertCursor(FC,("OID","Shape","TableName","Obj_ID","GeoJson","LayerId","LayerName")) as iCur:
               for row in cursora:
iCur.insertRow((row[0],row[1],layername,row[0],row[2],numbeeLayerId,layeraliasname))

now you can use MakeFeatureLayer function to generate your layer

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