Geographia Technica, No. 1/2006, pp. 49 - 54

C. CHIRILA, A. DUMITRASCU 

Datum Transformations in the Geographic Information Systems

ABSTRACT. – Datum Transformations in the Geographic Information Systems. Within the Geographic Information Systems the execution of the digital cartographic support is based on the numeric representation of geographic entities integrated in a reference system. From the practical point of view, the fundamental issue in instituting the cartographic database consists in defining the position of a point in the space, as related to the chosen reference system, respectively in establishing a geodetic datum. In practice it is often necessary to operate with one, two or several data, as the Geographic Information Systems comprise thematic pieces of information coming from various sources with distinct reference systems. For this purpose, one presents an information model of the datum transformations to ensure a large range of data conversion and transformation operations within a GIS, with a precision according to the requirements specific for a territory information system.

Keywords:datum, spatial reference, transformations, GIS, digital cartography