In ArcGIS, feature classes are homogeneous collections of features with a common spatial representation and set of attributes stored in a database table, for example, a line feature class for representing road centerlines. A feature is an object that stores its geographic representation, which is typically a point, line, or polygon, as one of its properties (or fields) in the row. Vector features (geographic objects with vector geometry) are versatile and frequently used geographic datasets, well suited for representing features with discrete boundaries, such as streets, states, and parcels. In these cases, you can extend these basic feature classes by adding a number of advanced geodatabase elements, such as topologies, network datasets, and terrains. Most parcel users want to maintain the integrity of shared feature boundaries in their datasets using a topology.Īs mentioned earlier, users often need to model such spatial relationships and behaviors in their geographic datasets. Also, note how adjacent parcels share common boundaries. For example, the sewer lines and manhole locations make up a storm sewer network, a system with which you can model runoff and flows. In this diagram, you can also see the potential requirement to model some advanced feature properties. In the illustration below, these are used to represent four datasets for the same area: The four most commonly used feature classes are points, lines, polygons, and annotation (a term for map text).
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