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Migration to ETRS89


SITNA reference system

From the 12th August 2013, the main geographic information systems of the Government of Navarra - Navarra Geoportal, IDENA, Cadastre, Cartography shop, Urban Information System of Navarra (SIUN), SIGPAC, Geology Website, Graves Map and the Coordination of Underground Conduits Website (PCCS) - quitted publishing their data in ED50 reference system to start using the new ETRS89 reference system, UTM projection zone 30N.

Also, following the 606/21013 Resolution, the information of the Territorial Wealth Register of Navarra, adopted the ETRS89 system.

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Why has it been done?

With the development of GPS navigation techniques during the 80s, and with the fundamental objective that all European countries had a cartography with a unique and homogeneous reference system, the European Union promoted the adoption of the ETRS89 as the geodetic reference system, which has the advantage of being a global system.

Consequently, the 1071/2007 Royal Decree established the ETRS89 as the official geodetic reference system for Spain and 1st January 2015 as the date from which all geographic information produced or updated by the Public Administrations should be disseminated in ETRS89.

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Recommendations

From the very first moment, we have tried to spread this change to the entire society of Navarra, in order that every person and every institution could react depending on their needs.

What everyone should know is that this migration will alter the coordinates of points, lines and contours represented on a map.

If only a single information is displayed, the change in the value of its coordinates is the only observed difference. The fact that the geographic coordinates of an object change (a point, a line or contour) does not mean that that object is actually altered. What is modified is its representation on the map. These variations in the representation may involve irrelevant differences , smaller than the inaccuracies resulting from any current measurement techniques.

Geographic data users should pay close attention to the reference systems of both original and final data. If data from SITNA are used in their activity , it should be taken into account that they are always available in ETRS89. Thus, if you provide data to the administration of the Autonomous Community you will need to design an appropriate strategy oriented to the transformation of your data into ETRS89.

Data transformation from ED50 to ETRS89, or vice versa, can be done using several tools, such as, GeoConverter, a free application developed by the public company Tracasa. Tracasa also provides diagnostic, training, support and data transformation services. You can contact here.

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More information

On the website of the National Geographic Institute (IGN) you can search for further information on this topic within this link.

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