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Utility feature classification

There are two predefined fields on each feature class in a domain network and structure network that provide a classification system for all the features in a utility system. These type attributes allow you to define feature types with specificity while limiting the number of feature classes, which is important for the performance of a utility network.

Asset group values for a gas pipe assembly feature class

The image above shows sample asset groups for a gas pipe assembly feature class. These are configured in the geodatabase using subtypes.

Type attributes

A utility network has two system-provided fields that are part of the default schema for network feature classes. These fields are set up during the configuration of a utility network to extend the asset classification in each feature class.

Asset group

The asset group attribute represents the major classification of utility features. The Asset group field is the subtype field of all feature classes in the structure network and domain network, with the exception of the SubnetLine class. Subtype values are established to define the major classification of your assets.

The following are examples of asset group subtypes for various domain networks:

  • Devices in an electric domain network: Breaker, Capacitor, Fuse, Recloser, Switch, and Transformer.
  • Lines in a gas domain network: Connector, Distribution, GatheringWater, StationPipe, and Transmission.
  • Assemblies in a water distribution domain network: CompressorStation, PumpStation, RegulatorStation, and TownBorderStation.

Asset type

The asset type attribute represents the minor classification of asset group types. The Asset type field is implemented as a set of attribute domains that are assigned at the subtype level for each asset group.

The following are examples of asset type values for a couple of domain networks:

  • A transformer asset group in an electric distribution domain network: StepTransformer, PowerTransformer, and DistributionTransformer.
  • A line feature class in a water distribution domain network: PVCpipe, ClayPipe, and CastIronPipe.

Review Configure a utility network for more details on the configuration of these attributes.

Caution:
Some important notes about managing subtypes and attribute domains used for network feature classification:
  • Ensure the split policy for the coded value domain is set based on the desired behavior for splitting utility network features. It is recommended to use a duplicate split policy for domains assigned to the asset type field. Review split policies for attribute domains.
  • The code value for the asset type attribute domain and asset group subtype cannot exceed a value of 1023.

Subtype group layers

ArcGIS Pro supports the use of subtype group layers. This is a composite layer of all the subtype values in a feature class and allows you to edit and display these multiple layers as if they were distinct layers on the map. When a domain network or structure network feature class is added to a map, the asset groups are used for symbolization if using subtype group layers. These layers draw more efficiently than an equivalent set of individual layers because a single call is made to the data source for the entire subtype group layer for operations such as panning, zooming, and editing.

To learn more, see Subtype group layers.