Gibt es eine Möglichkeit, ein geometric network programmatisch zu löschen und neu zu erstellen?

Question

<\/HEAD>Hallo zusammen,<\/P> <\/P> Ich aktualisiere gerade einen Wasserutility auf ArcMap und Enterprise 10.6.1 von v10.2.1. Ein Teil des Upgrade-Prozesses besteht darin, das Koordinatensystem aller Datensätze zu ändern. Ich habe ArcPy-Code geschrieben, um eine In-Place-Transformation in ein neues Koordinatensystem durchzuführen. Die Kernlogik ist;<\/P> 1. Projiziere alle Root-Feature-Classes und Feature-Classes in den Datensätzen in eine temporäre Geodatabase mit dem vorgesehenen Koordinatensystem.<\/P> 2. Leere alle Feature-Classes und Datensätze im ursprünglichen Workspace.<\/P> 3. Ändere die räumliche Referenz der ursprünglichen Workspace-Datensätze und Root-Feature-Classes auf das vorgesehene Koordinatensystem.<\/P> 4. Füge die projizierten Daten aus den temporären Geodatabase-Klassen zurück in die Quelldatensätze und -klassen ein.<\/P> <\/P> Dies vermeidet das Löschen vorhandener Feature-Classes und behält alle Berechtigungen usw. bei. Und es scheint korrekt zu funktionieren.<\/P> <\/P> Allerdings haben einige der Datensätze ein geometric network, und ich habe Schwierigkeiten, diese zu transformieren. Die meisten Befehle wie "project" funktionieren nicht bei Feature-Classes, die am GN teilnehmen. Ich hatte gehofft, das geometric network zu exportieren, das geometric network zu löschen oder zu deaktivieren, das Koordinatensystem der Datensätze mit der oben genannten Methode zu ändern und das geometric network dann wieder zu importieren oder zu aktivieren. Leider gibt es kein Tool, um das geometric network mit den daran teilnehmenden Feature-Classes, allen Konnektivitätsregeln und Gewichten zu exportieren. Selbst arcpy.Describe liefert mir nicht die Konnektivitätsregeln und Gewichte, sodass ich meinen eigenen "rebuild" geometric network Code schreiben könnte. Gibt es eine Möglichkeit, ein geometric network programmatisch zu exportieren und zu importieren/neu aufzubauen? Der einzige Link, den ich finden kann, ist https:\/\/www.arcgis.com\/home\/item.html?id=fa4e4cdd3bf64be7a1287fd1fd12e2f1<\/A>, welches anscheinend ein arcmap 10.2 Addin ist und es keine Version für 10.6+ gibt.<\/P><\/P> Jede Hilfe wird sehr geschätzt.<\/P> <\/P> Danke,<\/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.