Cadcorp Feature Database (*.fdb)

The Cadcorp Feature Database (FDB) cursor-based dataset is a file based database encapsulated in a single file, designed to store up to one terabyte (TB) of simple geometry type data. FBD files are of benefit to users who want to store medium to large volumes of geographic data without having to invest in database server technology and management resources, and for remote or mobile users. Unlike Access based equivalents, an FDB file supports multi-user, multi-edit operations.

The FDB is a cursor based dataset. This means that it only supports OGC Simple Features entities, specifically Points, LineString and Polygon items.

The FDB is not a replacement for (GB specific), it is an alternative. Please bear the following in mind when considering the best format to use:

• FDB format allows a number of different users to edit the same dataset.
• FDB supports feature level locking.
• FDB files do not support topology.
• FDB files only support Points, LineString and Polygon items in terms of geometry. They do not support true arcs, circles or Beziers (these features are facetted). Only Point Text items are supported.
• FDB files have homogeneous attributes, this means each item in an FDB will always have the same set of attributes, it doesn't matter if some of the schema attributes remain empty, but every feature will have the same structured schema; BDS files have heterogeneous attributes, this means you can have the same schema items on all features and you can add extra attributes to individual features, this cannot be done with FDB files (hence the New user attribute radio button on the FDB Schema - Add Property Column... > Pick Property dialog is unavailable).

FDB replaces the SDS native geometry format used in some earlier versions of Cadcorp SIS. SDS files cannot be created in SIS, although they can be opened, edited and saved.

Compatibility:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS Map Manager
• Cadcorp SIS Map Express
• Cadcorp SIS ActiveX Modeller
• Cadcorp SIS ActiveX Manager
• Cadcorp SIS ActiveX Viewer
• Cadcorp GeognoSIS

See full list of Dataset Formats

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