Validating Network Graphs

Note: Before you can validate network graphs, a network graph must first be constructed (see Connecting Network Graphs).

Network graph connection can be validated using a Rule to check Network Attributes.

Network Attributes

Network Attribute	Description
max_reported_islands	Threshold for the number of isolated islands reported. If not set, a default value of 1000 is used.
max_reported_positions	Threshold for the number of features reported in an island. If not set, a default value of 1000 is used.
name	Name of the network graph (used when constructing the network graph using the name parameter of the add_position, remove_position, connect_positions and disconnect_positions built-in operations).
num_islands	Number of islands found in the network graph. A coherent network has one island which is equivalent to the whole network graph.
report_cutoff_level	Threshold for creating a report. If the number of nonconforming objects exceeds the report cutoff, no report is produced. If not set, a default value of 1000 is used.

In the following example, a Rule uses the num_islands network attribute to validate the network graph coherence. The name field is not applicable so has not been used.

The expected result is that the network graph should only have one island.

Rule using the **num_islands** network attribute

Note: In network graphs with more than one island, the main island is considered to be the one which contains 50% or more of the objects queried.

Validation Results

Once created, network graph validation rules must be run using a Check Rules Task, which will provide Task Results.

Note: The attributes num_islands and isolated_islands may not report all instances of islands and objects if they exceed reporting thresholds. See the data engineer who constructed your networks for details of the reporting thresholds set.