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Layers
 
Managing Spatial Columns
Spatial Indexing
Updating Features
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In ArcSDE, layers are an organizational concept for managing spatial data. The lowest level of spatial information is the location and shape of features that are stored in spatial tables. Geographic features that are thematically similar and geographically continuous constitute a layer in ArcSDE. When you add a spatial column to a table, you are creating a layer and specifying what types of features are allowed in the layer. The purpose of layers is to manage the spatial tables and their associated metadata.
 
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