Existe-t-il un moyen de supprimer et de recréer programmétiquement un geometric network ?

Question

<\/HEAD>Bonjour à tous,<\/P> <\/P> Je suis en train de mettre à niveau une utility d'eau vers ArcMap et Enterprise 10.6.1 depuis la version 10.2.1. Une partie du processus de mise à niveau consiste à changer le système de coordonnées de tous les jeux de données. J'ai écrit du code ArcPy pour effectuer une transformation in situ vers un nouveau système de coordonnées. La logique principale est ;<\/P> 1. Projeter toutes les classes d'entités racines et les classes d'entités dans les jeux de données vers une géodatabase temporaire avec le système de coordonnées prévu.<\/P> 2. Tronquer toutes les classes d'entités et jeux de données dans l'espace de travail original.<\/P> 3. Changer la référence spatiale des jeux de données et des classes d'entités racines de l'espace de travail original vers le système de coordonnées prévu.<\/P> 4. Ajouter les données projetées des classes de la géodatabase temporaire aux jeux de données et classes sources.<\/P> <\/P> Cela évite de supprimer les classes d'entités existantes en conservant toutes les permissions, etc., inchangées. Et cela semble fonctionner correctement.<\/P> <\/P> Cependant, certains des jeux de données ont un geometric network et j'ai du mal à les transformer. La plupart des commandes telles que "project" etc. ne fonctionnent pas sur les classes d'entités qui participent au GN. J'espérais exporter le geometric network, supprimer ou désactiver le geometric network, changer le système de coordonnées des jeux de données en utilisant la méthode ci-dessus et réimporter ou réactiver le geometric network. Malheureusement, il n'existe aucun outil pour exporter le geometric network avec les classes d'entités qui y participent, toutes les règles de connectivité et poids. Même arcpy.Describe ne me donne pas les règles de connectivité et poids pour que je puisse écrire mon propre code "rebuild" du geometric network. Existe-t-il une option pour exporter et importer\/reconstruire programmétiquement un geometric network ? Le seul lien que je trouve est https:\/\/www.arcgis.com\/home\/item.html?id=fa4e4cdd3bf64be7a1287fd1fd12e2f1<\/A> qui semble être un addin arcmap 10.2 et il n'y a pas de version 10.6+ pour celui-ci.<\/P><\/P> Toute aide serait grandement appréciée.<\/P> <\/P> Merci,<\/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.