The objects can be classified by grouping according to their features. To the individual classification levels - inclusive of the level of the object, too -can attributes and relationships be attached, which describe the features of the objects, things of the real world essential from the point of view of DAT in form of data.

In the database DAT the following classification levels are used:

• object class,
• object group,
• object sorts.

The hierarchical structure of this is shown on this figure:

Each of the levels has a name and a code:

• in case of object class: capital letters of the ABC on the first position of character,
• in case of object group: capital letters of the ABC on the second position of character,
• in case of object sorts: serial number ranging from 1 to 99 on the third and fourth position of character.

A	TECHNICAL FRAMEWORK MAP
	AA	HORIZONTAL AND 3D GEODETIC CONTROL POINTS
	AB	VERTICAL GEODETIC CONTROL POINTS
	AC	DETAIL POINTS
	AD	PUBLIC ADMINISTRATION UNITS
	AE	PUBLIC ADMINISTRATION SUBUNITS
B	PARCELS
	BA	PUBLIC DOMAIN PARCELS
	BB	NOT PUBLIC DOMAIN PARCELS
	BC	SUBPARCELS
C	BUILDINGS, FENCES AND TERRAIN FEATURES
	CA	BUILDINGS (also those classifiable into the classes of object D, E, F)
	CB	ACCESSORIES OF BUILDINGS (accessories of object types of the CA)
	CC	FENCES AND SUSTAINING WALLS (also those can classifiable into the classes of object D, E, F)
	CD	TERRAIN FEATURES
D	TRANSPORTATION FACILITIES
	DA	IDENTIFICATION POINTS OF TRANSPORTATION FACILITIES
	DB	TRANSPORTATION FACILITIES OF INHABITED AREA
	DC	ROADS (RURAL AREA)
	DD	RAILWAYS AND TRAILS OPERATED WITH ELECTRICITY
	DE	FACILITIES OF AIR TRAFFIC
	DF	TECHNICAL OBJECT OF THE TRANSPORTATION
E	CONDUITS, CABLEWAYS
	EA	AXIS OF CONDUITS, CABLEWAYS
	EB	TECHNICAL OBJECTS OF CONDUITS, CABLEWAYS
F	WATERS AND HYDROLOGICAL FACILITIES
	FA	FLOWING AND STILL WATERS
	FB	WATER PUBLIC UTILITIES
	FC	HYDROLOGICAL TECHNICAL OBJECTS
G	RELIEF
	GA	CONTOUR LINES
	GB	RELIEF CONFIGURATIONS
	GC	DIGITAL TERRAIN MODEL
H	BOUNDARIES
	HA	BOUNDARIES OF LAND USE CATEGORIES
	HB	BOUNDARIES OF QUALITY CLASSES OF ARABLE LAND
	HC	SURVEY AND DAT REGISTRATION CIRCUITS
	HD	BOUNDARIES OF SPECIAL INTEREST OR DERIVED BOUNDARIES
	.	.

The object table of hierarchical structure defining the object sorts, object groups and object classes of the digital basic map can be found in Appendix 1.

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