Abstract
Abstract. The state Coordinate Reference System (CRS) of the Republic of North Macedonia (RNM) has been established a century ago, by the Military Geographic Institute of the Yugoslavia Kingdom. It is in official usage entire period up to day. In international public EPSG registry of geodetic datums, spatial reference systems, Earth ellipsoids, coordinate transformations and related units of measurement, CRS for RNM is recognizable within 3 EPSG codes 6204, 6316 and 8679.First code EPSG 6204 represents current state CRS for the entire country area, based on current law, however unfortunately this CRS is official by the law but it is not used for developing the official spatial data published in geoportals of Agency for Real Estate Cadastre (AREC) and NSDI geoportal of RNM. The second code EPSG 6316 is defined to be used for 6 countries of former Yugoslavia that covers area between 19.5°E up to 22.5°E longitude, which does not correspond with the practical and official usage of CRS for working with spatial data in RNM and CRS law definition in RNM. Third code EPSG 8679 has never been used in RNM, which covers eastern part of RNM and Serbia beginning from 22.5°E.Beside of problems with EPSG codes, default transformation parameters of EPSG 6316 have low accuracy and can not be used for data overlapping with open layers. Therefore, redefined new EPSG codes for state CRS of RNM are proposed in this paper.
Highlights
Coordinate Reference Systems (CRS) represents the mathematical model for location defining of spatial entities within the particular referent frame, which contain geodetic datum, and may contain map projection as well additional parameters
The EPSG dataset conforms to ISO 19111:2019, that is distributed as EPSG registry, EPSG database and in a relation model as SQL scripts (IOGP 2019), as Spatial Reference System Identifiers (SRIDs) and data definition for identifying coordinate reference systems, projections, and performing transformations between them, used by most of geographic information systems and GIS libraries as tool for standardized developing and usage of spatial data by all users
In the example given in figure 2 from NSDI geoportal of North Macedonia, after the coordinate values, it is marked “Macedonia State Coordinate System zone 7”, easting coordinates are in contradiction with CRS parameters stated in article 42 of the Law for real estate cadaster published in Official gazette no.55 of year 2013, which means that position of spatial data in NSDI geoportal are not given in “Macedonia State Coordinate System”
Summary
Coordinate Reference Systems (CRS) represents the mathematical model for location defining of spatial entities within the particular referent frame, which contain geodetic datum, and may contain map projection as well additional parameters. In practice it is known as spatial reference system (SRS) which is synonym of CRS [9]. Proposed CRS’s for North Macedonia should be compiled correctly on a common level of abstraction with the clear structure for wide usage by geo community and other experts who use spatial data, without need for detailed knowledge for CRS, according to basic rule of ISO 19111:2019
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