What term describes the unique identifier assigned to a geographic feature in GIS?

The term that describes the unique identifier assigned to a geographic feature in GIS is "Feature ID." This identifier is crucial in geographic information systems as it allows for the distinct identification and management of each individual feature within a dataset. The Feature ID ensures that each geographic feature, such as a point, line, or polygon, is uniquely distinguishable from others, enabling accurate data retrieval, updates, and analysis.

In the context of GIS, this identifier aids in the organization and referencing of features, ensuring that various attributes associated with that feature can be accurately linked and accessed. The use of a unique identifier is essential for maintaining the integrity of spatial data and for performing operations such as querying, spatial analysis, and data manipulation.

The other terms listed do not accurately describe the unique identifier function. While "Layer Code," "Spatial Key," and "Data Tag" may relate to data organization or management, they do not specifically refer to the unique identifiers critical for distinguishing individual geographic features in a GIS environment.