Map object attributes (Semantics)

Besides map symbol and ground coordinates map object can have some individual attributes. For example «Road» object characterized by «Width» , «Coating material» attributes etc. Set of attributes attached to object in digital form is called Object semantics.

The map object can have no semantic. All  objects properties can be placed in the external data base. Though semantics is an optional object parameter but it is recommended.

Map objects can have hundreds sorts of different characteristics. The most of them are optional. External data bases application with fixed fields number and constant records size reduces to colossal memory allocation. Semantic records have a variable length and key form of a data representation. That provides compact storage and fast data processing. Digital map  handle system provides queries for searching and displaying map objects based on its attributes.

The editing and saving mode is called by a space.