¿Existe alguna manera de eliminar y recrear programáticamente una geometric network?

Question

<\/HEAD>Hola a todos,<\/P> <\/P> Estoy actualizando un servicio de agua a ArcMap y Enterprise 10.6.1 desde la versión 10.2.1. Parte del proceso de actualización es cambiar el sistema de coordenadas de todos los conjuntos de datos. Escribí código ArcPy para realizar una transformación in situ a un nuevo sistema de coordenadas. La lógica principal es;<\/P> 1. Proyectar todas las clases de entidades raíz y las clases de entidades en los conjuntos de datos a una geodatabase temporal con el sistema de coordenadas previsto<\/SPAN>.<\/P>2. Truncar todas las clases de entidades y conjuntos de datos en el espacio de trabajo original.<\/P>3. Cambiar la referencia espacial de los conjuntos de datos y clases de entidades raíz del espacio de trabajo original al sistema de coordenadas previsto.<\/P>4. Añadir los datos proyectados desde las clases de la geodatabase temporal de vuelta a los conjuntos de datos y clases fuente.<\/P><\/P>Esto evita eliminar las clases de entidades existentes manteniendo todos los permisos, etc., igual. Y parece estar funcionando correctamente.<\/P><\/P>Sin embargo, algunos de los conjuntos de datos tienen geometric network y estoy teniendo dificultades para transformar estos. La mayoría de los comandos como "project" etc., no funcionan en clases de entidades que participan en la GN. Esperaba exportar la geometric network, eliminar o deshabilitar la geometric network, cambiar el sistema de coordenadas de los conjuntos de datos usando el método anterior y reimportar o reactivar la geometric network. Desafortunadamente, no hay herramienta para exportar la geometric network con las clases de entidades que participan en ella, todas las reglas de conectividad y pesos. Incluso arcpy.Describe no me da las reglas de conectividad y pesos para que pueda escribir mi propio código para "reconstruir" la geometric network. ¿Existe alguna opción para exportar e importar/reconstruir programáticamente una geometric network? El único enlace que puedo encontrar es https:\/\/www.arcgis.com\/home\/item.html?id=fa4e4cdd3bf64be7a1287fd1fd12e2f1<\/A> que parece ser un addin para arcmap 10.2 y no hay versión 10.6+ para ello.<\/P><\/P> Cualquier ayuda será muy apreciada.<\/P> <\/P> Gracias,<\/P> Vish<\/P><\/BODY><\/HTML>

BillyBuerger · Answer

Yes, you can use ArcPy to do a lot of these things as well.  Depending on how many you have to do though, it can be a bit of work to manually build the specific scripts for each network.  Plus, the OP specified that it's the loading of all the network rules that is a big part of the issue.  I would assume there are ArcPy commands for that as well but I've seen some networks with a LOT of rules.  So unless you have a process that can generate those, building the python script to do that could be a lot of work as well.

Reading the OP again, I realize I've done something extremely close to what was described as far as wanting to reproject an existing database as opposed to creating a new database.  The other part of it for us is that we didn't (or couldn't) delete and replace the features as that would generate new OIDs which could be a problem for relationships both internal and possibly external "soft" relationships as well.  Our process was similar as far as projecting to a new GDB and changing the Spatial Reference of the existing classes.  But instead of deleting the features and loading in the updated projected features, we left the features as they were and then ran a process to update the geometry of each feature to the geometry from the projected GDB.  I likely had to drop spatial indexes to avoid index errors do to the large change in X/Y coordinates.  And I also had to regenerate the extents for each feature class after the updates.  There may have been a few other updates and fixes that needed to happen to make it all work.  And of course I used Geodatabase Designer (or our own version of it) to rebuild the geometric network and relationship after the fact.  But it was successful in the end.  It's been some time, did you get it to work or are you still working on it?

JoseSanchez · Answer

You can use ModelBuilder to build a model that  Creates a Geometric Network, then you can export it to Python. to run it in a script

To delete the Geometric Network

arcpy.Delete_management(FC Network , "GeometricNetwork")
 print "Delete Geometric Network"

arcpy.Delete_management(FC Network_Junctions, "FeatureClass")
 print "Delete Network Junctions"

arcpy.Delete_management(Table NETWORK_BUILDERR , "Table")
 print "Delete Table NETWORK_BUILDERR"

To Create a Geometric Network

# Local variables:

Water = "C:/arcgis/ArcTutor/BuildingaGeodatabase/Montgomery.gdb/Water"

# Process: Create Geometric Network

arcpy.CreateGeometricNetwork_management(Water, "Water_Net", "Distribmains COMPLEX_EDGE NO;Fittings SIMPLE_JUNCTION NO;Hydrants SIMPLE_JUNCTION NO;Sysvalves SIMPLE_JUNCTION NO;Tanks SIMPLE_JUNCTION YES;Transmains COMPLEX_EDGE NO", "0.5", "Friction_Factor DOUBLE #", "Distribmains FRICTION_FACTOR Friction_Factor;Transmains FRICTION_FACTOR Friction_Factor", "", "PRESERVE_ENABLED")

BillyBuerger · Answer

Geodatabase Designer 2 does exactly this but unfortunately hasn't been updated in a LONG time.  It still works on 10.2.1 at least although in the link you reference, apparently it doesn't work on some of the newer versions even with the work around.  All of the ArcObjects calls still exist and it's the installation method and reliance on the GxDockableWindow that cause problems.  So it's possible to reuse the code in a new extension or add-in that doesn't use these and get the same results.  But it is a bit of work as there's a lot of code in there.  You don't need to do everything though as GDB designer does a lot more than just geometry networks.  At the very least, it can be used as a reference for building a process to rebuild a network with all the same parameters.