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CROATIAN CARTOGRAPHIC DATA MODEL, CREATION AND IMPLEMENTATION
Z. Biljecki,", H. Halapija*, D. Piskor?, A. Osmanagié “, T. Tonkovié*, S. Franié?, V. Topolovec ^, D. Perié?
*GEOFOTO LLC, Hercegovacka 61, 10 000 Zagreb, Croatia — (zvonko, hrvoje, drazen, aida, tomislav, snjezana,
damir)@geofoto.hr
^ Filozofski fakultet Rijeka, 51 000 Rijeka, Croatia — velimir.topolovec1 @zg.tel.hr
Commission VI, WG VI/4
KEY WORDS: Cartographic data model, CROTIS (Topographic Information System of the Republic of Croatia), Topographic
database, Cartographic database, Topographic data, Database design, Unified Modeling Language (UML)
ABSTRACT:
Croatian project Cartographic Data Model (KMP) has been started as a component of the STOKIS (1995, Official Topographic and
Cartographic Information System) project. It represents principal contribution to the realisation of STOKIS general design. The
cartographic data model conforms to CROTIS (Topographic Information System of the Republic of Croatia). It enables the
generation of the cartographic database from topographic one. Classification of data is performed by logical grouping of objects and
depends on geometry, type and properties of features. The cartographic data model describes structure of cartographic database and
all attributes, categories, types and fields. Description of geometry and exchange of data is performed according to the specification
of ISO Standards, adapted by Technical Committee ISO/TC 211, Geographic information/Geomatics and OpenGIS Consortium.
Creation of the cartographic data model is the basis for the creation of cartographic database. The next step is direct implementation
of vector model that contains graphic and alphanumeric elements. The cartographic key must stay identical to TK 25 and maps of
other scales.
1. INTRODUCTION abstraction (the model of the real world) the real world objects
and the relations among them are decomposed into the
Croatian project Cartographic Data Model (KMP) has been gbstraction hierarchy. i.e. the combination of aggregations and
started as a component of the STOKIS (1995, Official generalisations.
Topographic and Cartographic Information System) project. It
represents principal contribution to the realisation of STOKIS The data modelling is the only phase in development of
general design. The basic principle of the Project is functionally information systems. Referring to the definition itself, we must
oriented conceptual modelling in cartography intended for the conceive the data model in such a way, that it would provide an
production of cartographic database. The cartographic data efficient access to data, and enable adequate processing of the
model needs to conform to the contents of HOK, TK 25 data.
(Croatian base map 1:25,000), and small-scale maps respecting
the standards of the International Standard Organisation (ISO), The data model, as a formal system, must contain the following
Technical Committee 211 (TC 211), for geoinformation components (Varga, 2001):
systems. The essential condition is also the compatibility with = objects, as the principal database elements;
topographic database model CROTIS. The project KMP =" set of operations that can be performed on the objects;
encompasses the modelling in cartography that give the most " set of general data integrity rules that define
important segment of cartographic information system. implicitly or explicitly, the set of consistent states of
data or the changes of states.
The realisation of this Project and the establishment of the The data model represents the basic concept of the Database
cartographic database according to this model will lead to the Management System (DBMS).
implementation of the second part of the conceptual project
STOKIS enabling thus the establishment of unique topographic The object-oriented approach has been accepted for the
and cartographic information system. construction of the Cartographic Data Model (KMP) of the
Cartographic Information System (KIS). The data model is used
The target is to process, present and maintain the geometric and for description of the KIS data structure that is implemented
alphanumerical spatial data within the topographic database in into the cartographic database due to the selected DBMS.
accordance with the economic needs, user requirements, and
ISO/TC 211 standards for topographic and cartographic At first the topographic data with all its geometric and attribute
information systems and OpenGIS. properties are saved into the topographic database (TBP) in
agreement with the topographic data model. The database
2. CONCEPTUAL MODELLING enables retrieval of single objects according to given criteria.
and their processing by using the catalogue symbols
Conceptual modelling is based on abstractions, i.e. on the (cartographic key for TK25 and HOK(SGA, 2000, 2001)). A
methodology of modelling based on recognition of the cartographic symbol is attached to each object. These data is
similarities between objects in the real world and temporary then saved in the cartographic database (KBP). The (KBP)
negligence of the differences among them. By means of the
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