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Seal 150 anniversary implementation level zero in mainland Spain. Alicante

Price unit:
2,10 €

Description

Discover the stamp that commemorates the implementation of the "level or zero level" of the National Reference of Altitude, in the port of Alicante . A level that is still valid today.

On the stamp we can see the images of the door of the Fundamental Tidal Station of the Mediterranean, and the plaque that recognizes Alicante as the national altimetric reference.

The Mediterranean Sea has a coastline that suffers fewer level swings than other coastal areas of Spain. This is due to its smaller size, its geographical location and the fact that it is a relatively confined body of water. Thus, Alicante, bathed by the Mediterranean, has average oscillations of sea level far from other cities and, in addition, had one of the first railway lines that connected the city with the rest of Spain . This once facilitated operations for the transfer of altitude to other locations, so its location as a reference point was considered ideal.

The National Geographic Institute , founded in 1870, faced the mission of carrying out a national topographic survey that would establish the exact altitudes, both of each locality and of the different geographical features. Therefore, it was essential to have a reference to obtain the altimetry of the future National Topographic Map.

To obtain this altimetric reference, a technician of the Institute observed and patiently noted, for 4 consecutive years (1870-1874) and at different times of the day (9, 12, 15 and 18 hours), the level of the tide measured on a metal ruler (called tidal rule) located in the Levante dock of the Port of Alicante . Initially, it obtained an average sea value of 0.430 m with respect to the tide gauge reference point.

Later and for practical reasons this reference was moved to another place with better guarantees of durability, specifically to the first step of the main entrance of the City Council of Alicante, where a bronze disc marks the fundamental sign NP1 and whose altimetric value is 3.4095 m. above mean sea level in the harbor.

ThisIt was the first altimetric reference obtained on land and has since served as the origin of the precision leveling of the entire Spanish peninsular territory.

On March 1, 1874, observations on the tidal rule were interrupted and measurements began on the first tide gauge that worked in Spain and was operational until 1924. In August 1926 was installed in the fundamental tidal station (Alicante I), built in 1925 on the outer breakwater of the Levante boardwalk, the Thomson tide gauge that was operational until 1969.

More recently, in 1954, a new tidal station (Alicante II) was put into operation, located at the mouth of the port, in which more modern equipment has been installed that, in addition to providing tidal data, have allowed to carry out other important works (geodesy, altimetry, gravimetry, etc.) for the maintenance of the current geodetic reference system (ETRS89).

 

Product of Filatelia Correos, sold and sent by Correos

Printing: Offset on coated support, gummed.

Seal size: 40.9 x 57.6 mm .

Postal value of the stamp: 2,1€ .

Publication date: 13 June 2022 .

Print run: 134,000 stamps.

Product exempt from VAT .

2,10 €

Description

Discover the stamp that commemorates the implementation of the "level or zero level" of the National Reference of Altitude, in the port of Alicante . A level that is still valid today.

On the stamp we can see the images of the door of the Fundamental Tidal Station of the Mediterranean, and the plaque that recognizes Alicante as the national altimetric reference.

The Mediterranean Sea has a coastline that suffers fewer level swings than other coastal areas of Spain. This is due to its smaller size, its geographical location and the fact that it is a relatively confined body of water. Thus, Alicante, bathed by the Mediterranean, has average oscillations of sea level far from other cities and, in addition, had one of the first railway lines that connected the city with the rest of Spain . This once facilitated operations for the transfer of altitude to other locations, so its location as a reference point was considered ideal.

The National Geographic Institute , founded in 1870, faced the mission of carrying out a national topographic survey that would establish the exact altitudes, both of each locality and of the different geographical features. Therefore, it was essential to have a reference to obtain the altimetry of the future National Topographic Map.

To obtain this altimetric reference, a technician of the Institute observed and patiently noted, for 4 consecutive years (1870-1874) and at different times of the day (9, 12, 15 and 18 hours), the level of the tide measured on a metal ruler (called tidal rule) located in the Levante dock of the Port of Alicante . Initially, it obtained an average sea value of 0.430 m with respect to the tide gauge reference point.

Later and for practical reasons this reference was moved to another place with better guarantees of durability, specifically to the first step of the main entrance of the City Council of Alicante, where a bronze disc marks the fundamental sign NP1 and whose altimetric value is 3.4095 m. above mean sea level in the harbor.

ThisIt was the first altimetric reference obtained on land and has since served as the origin of the precision leveling of the entire Spanish peninsular territory.

On March 1, 1874, observations on the tidal rule were interrupted and measurements began on the first tide gauge that worked in Spain and was operational until 1924. In August 1926 was installed in the fundamental tidal station (Alicante I), built in 1925 on the outer breakwater of the Levante boardwalk, the Thomson tide gauge that was operational until 1969.

More recently, in 1954, a new tidal station (Alicante II) was put into operation, located at the mouth of the port, in which more modern equipment has been installed that, in addition to providing tidal data, have allowed to carry out other important works (geodesy, altimetry, gravimetry, etc.) for the maintenance of the current geodetic reference system (ETRS89).

 

Product of Filatelia Correos, sold and sent by Correos

Printing: Offset on coated support, gummed.

Seal size: 40.9 x 57.6 mm .

Postal value of the stamp: 2,1€ .

Publication date: 13 June 2022 .

Print run: 134,000 stamps.

Product exempt from VAT .

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