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Cartographic precedents

The Goal of establishing a national cartographic service and the fundamental actions for its implementation

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Cartographic precedents

The Hellenic Military Geographical Service is the Cartographic Service of the Country with the longest history. Since the dawn of its history, it has been continuously at the Service of the Armed Forces and the wider society as a whole.

However, in order to understand the path towards the establishment of the Service, we must unravel the thread of the historical path starting from 1832. In that year, with the Treaty of London, the Greek state was officially established and the first borders were drawn, which delimits the Greek territory on the Pagasitikos - Amvrakikosriver line. The second major expansion of the country took place in 1881, with the Treaty of Constantinople, according to which, Thessaly and part of Epirus, east of the Arachthos River were incorporated intoGreece. For the drawing of the new borders, 13 Map sheets were issued at a scale of 1:50,000 under the supervision of the JohnCharlesArdagh (1840-1907), representative of England to the Delimitation Committee and Director of Topographical Works.

From that moment on, the idea of creating a national cartographic service began to take shape. Greece had to rely on its own forces. All previous works on mapping the Greek geographical area, came from the French and English, the great powers of the time, who were obviously serving their own national interests. The cadastral survey of the country, especially with the problems created by the distribution of national lands from the time of Governor Kapodistrias and King Otto, but also subsequently during the successive governments of Koumoundouros, Trikoupis and Deligiannis, was now a one-way street. At the same time, the implementation of major development projects required the existence of an applicable cartographic infrastructure. The country finally acknowledges for the first time, 70 years after Kapodistrias, the importance of acquiring a national cartographic infrastructure. Based on real facts and not on improvisations, it wisely and without complexes, resorted to the solution of drawing on and transferring know-how from the brilliant achievements of other European countries.

The first contact of Greek officers with high-level topographic and geodetic field work on Greek soil, takes place during the scientific mapping of Attica, on a scale of 1:25000. The entire project is carried out under the supervision and guidance of Captain of the Prussian army JohannAugustKaupertand Lieutenant Alten. The work, which began in 1875 and completed in 1894, resulted in the publication of 32 maps covering the wider region of Attica, at a scale of 1:25,000 with the title KartefromAttica. This large cartographic venture had a special value, since it would constitute a kind of cognitive laboratory for the training and high-leveladvanced education of Greek Officer Topographers.

The expertise acquired was applied in the field, for national purposes from 1887-1889, by the team of the General Alexandros N. Mavrokordatos. These are the first thoroughly Greek systematic works, which essentially constitute the precursor of the large cartographic enterprise of the years that followed. During the same period and specifically in the middle of it, in 1884, the Map of the Kingdom of Greece was published by the Geographical Military Institute of Vienna, under the supervision of YfikratisKokkidis , a prominent Greek officer, engineer and architect, and following the revisions by the great German cartographer of the time, HeinrichKiepert . This work was part of the broader effort for the cartographic coverage of the Greek geographical area on a single scale, following the second territorial expansion of the country in 1881.

The aforementioned actions constitute the doorway to the country's joining into the scientific field of cartography in a more systematic and organized manner. However, the first political action that comprised the stepping stone for the creation of a military cartographic service, was the publication in 1882 of the Law on Military Cartography, in article 31 of which. "The Government is allowed to invite foreign Army officers,in order to study the Military Organization of the State, or other services related to the military service and for the introduction to the Army, diverse applications. This service may not last more than five years unless it is so defined by a specific law".

The cornerstone to the establishment of the Service was laid in 1888; with the issuance of the 22 November 1888 Decree, by which the first-class engineers K. Karouzos and N. Palamas were sent to Central Europe (Austria, Germany and elsewhere) in order to "... study the methods of measuring land and plantations, as well as the organization of a special department of the State Cartographic Service, at the Ministry of MilitaryAffairs".

At that time, there were very few who could undertake such a project. The Greek Ministry of War and its officials did not have the experience required, scientific equipment, as well asthe specialized knowledge required for the organization and effective functioning of the newly established Military Service. Carouzos had already conducted a scientific research for the progress of the geographical services of England and Ireland in 1883 and his work on the growth of the European cartography was renowned. His selection at that time, was possibly the outcome of the recent publication of his second study on the cartographic work of the Austrian-Hungarian geographical service. Among the cases examined were the progress in the field of cartography by England, France, Germany, and Austria-Hungary, with the latter selected as the most qualified solution. This choice, based on the economic implications of the entire project, was considered the most appropriate, since the cadastral map that the Austrians had already drawn up in the case of Bosnia and Herzegovina would constitute the model for the case of Greece. Thus, direct - high-level cooperation with the Austrians was selected.

Therefore, Carouzoswas ordered to initiate negotiations. He, seemingly, has had contacts with the Austrian officials through Trieste, where the booming Austrian-oriented Greek community had significant influences over the Greek state officials. He, by himself, managed,despite the Austro-Hungarian Foreign Minister’shesitations onthe importance and potential political consequences of such a mission, to convey his position that the preferred selection was based exclusively on technical criteria. The whole issue was concluded in 1889 with the signing of the agreement for the transfer of Austrian officers between the Austrian Ministry of Military Affairs and the Greek Embassy in Vienna. The invitation of the Austrian military contingent, negotiated by Carouzos, was undoubtedly a choice of technical excellence.

The cartographic sequels (1889-1918)

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The cartographic sequels (1889-1918)

The Cartographic Consequences of the Foundation

The establishment of the Service and the work of the first thirty years

The Austrian mission was headed by Lieutenant General Heinrich Hartl , who arrived in Greece on 8 August 1889, while the following day, Lieutenant General MessalasEvlampiosjoined the Mission, to be followed by Lieutenant Generals Konstantinopoulos Konstantinos and Nieder Konstantinos. As such the Austrian mission team was completed with the arrival on 23 August 1889, Lieutenant General Francis Lerhl and Lieutenant General Julius Lor. These officers formed the core of the establishment of the HMGS, under the title "Geodetic Mission", which in 1891 was renamed "Geodetic Detachment" and in 1895 to "Army Cartographic Service".

The core of the Service had excellent executives. An explosive combination of experience, enthusiasm and knowledge. Heinrich Hartl, director of the geodetic department of the Vienna Geographical Institute, a great geodesist of the time with extensive field experience, who later, after his retirement, was appointed professor of geodesy at the University of Vienna. EvlampiosMessalas, later Commander of the Cartographic Service, a pioneer and pioneer of cartographic support in the Balkan Wars. Konstantinos Nieder, a prominent military man, later Commander of the General Staff of the Army, distinguished himself in the operations of World War I (Macedonian Front) and the Asia Minor Campaign, while he served as Deputy Minister of Military Affairs in the government of Theodoros Pangalos. Konstantinos Konstantinopoulos, the mounted colonel leading the entry of the first detachment into Thessaloniki in 1912. These and many other distinguished Cartographic Officers, geodesists and topographers, distinguished themselves in all war and post-war theaters of operations from the Balkan Wars to the Macedonian Front and the Asia Minor campaign, but were also tested in important positions of responsibility from 1909 to 1922.

From the first days of operation of the Geodetic Mission, Hartl prepared a detailed work plan, based on the development of the essential geodetic infrastructure, a key element for subsequent mapping and map design. During his stay in Greece, the basic trigonometric network of the 1st, 2nd and 3rd order was developed along with the necessary geodetic measurements and calculations. Worthy of attention are Hartl 's views, which even after 130 years still remain extremely relevant and timeless. Under these principles, he delineates in a simple, clear and coherent way, the fundamental framework of its operation. He underlines the great importance of the quality and accuracy of geodetic and topographic measurements, so that they would last over time. He points out the value of the produced geographical products, as fundamental materiel, provided to state authorities, companies and the individuals. Finally, he proposes the centralized operating model, highlighting in particular. the imperative need to create a single authority for informing and observing the work of mapping throughout the country.

Following the departure of the Austrian mission in 1896 until 1905, the administration of the Service was taken over by the General Alexandros Kontostavlos (1860-1916), who secured the absolute control of the Service over the cartographic development of the Country. He updated structures and functions of the Service, as well as the topographic “field spirit” that distinguished its officers, aiming to render it as the most distinguished corps of the Hellenic Army, with particularly notable scientific and technological achievements in the field, in close, systematic and very effective cooperation with Vienna.

The works under his administration focused on the completion and classification of the geodetic measurements of the trigonometric network from the period of the Hartl administration. These works were interrupted in 1897 during the unfortunate 10-day Greek-Turkish War. This war, which ended with disastrous consequences for the country, brought to the surface the deep- rooted problems of the absence of cartographic planning, due to the politicaldebates of that period and the lack of coordination and decision making at the governmental level, whereby the army entered the war without maps. The Service had to urgently launch and implement a map production plan with the border areas as top priority. Kontostavlos prepares and plans the production program of the Thessalia map sheet of1:75,000scale. In order to support the mapping program, 1070 damaged trigonometric points are replaced in the Thessaly region, while the mapping work ofTrikala and Larissa map sheets began.

Kontostavlos was succeeded in the administration of the Service in 1906 by Maj. Gen. (M.) MessalasEvlampios. The period 1906-1910 and 1912 of Messalas' administration of the Cartographic Service was one of the most productive in field work and is directly linked to the preparation and production of the map sheets of Thessaly at a scale of 1:75,000, as well as to the cartographic work in the new territories liberated by the Greek Army in 1912. A first priority project was the mapping of the border areas according to the planning of the previous years. This work is of particular value, since it is based on the geodetic work of the years 1889-1906 and through it, all the work that has preceded it, as well as the know-how that was invested, is essentially transformed into cartography. The distribution provided for the production of 17 Map Sheets (MS), which basically cover the territorial area closest to the then borders of Greece, as they were formed before the Balkan Wars. These are, without exaggeration, masterpieces of cartographic art and culture. The illustrative rendering of the relief, the accuracy and detail of the recording of geographical elements, are combined with the necessary marginal elements in which, it should be noted, the distribution and names of the recording plates are indicated, as well as all the Officers who took part in the work for the production of the MS with their rank and full name.

All the above maps are printed in Vienna in the presence of Greek officers of the Army Cartographic Service, who plan and supervise the work. Their presence was of key importance, since they worked in an area of high professional standards for that time, they were scientifically and technically trained in the entire scope of cartographic works, thus gaining valuable cartographic knowledge and experience for our country. This cooperation will continue until 1919, the year when the Military Cartographic Service acquires autonomous printing capabilities. The cartographic work under the command of Messalas and especially the Thessaly map sheets will constitute in 1912 the cartographic spearpoint of the Greek Army, on its way from the Thessaly borders and Melouna, towards Epirus and Macedonia.

These two brilliant officers reconstruct Cartography, imparting the great dynamic that characterizes it, from 1897 to 1912, and later on The officers of the Service, the so-called cartographers, participated everywhere since 1914, from the Balkan Wars and the fields of the Macedonian Battle, to the wonderful, unprecedented for the Greek data up to that time, construction and operation of the cartographic infrastructure, capturing inch by inch the territory of the country, with topographic and geodetic measurements in every mountain rangeand plain, island and islet and especially, after 1912, its liberated territories.

After the departure of Messalas, Deputy Commander Panagiotis Photiadisassumes command ofthe Military Cartographic Service, asone of the longest-serving and most important Commanders. With a lengthy career in the Service since 1892, he assumed its administration from 1914 to 1925, a period linked with the upgrade of the Service, leading it into a new era, while at the same time he organized and executed an exemplary cartographic preparation of the Greek participation in the Allied Front of Thessaloniki and the Asia Minor Campaign, culminating to the Greek cartographic achievementsin Asia Minor. An officer,deeply versed with the subject, experience from the Geographical Institute of Vienna and organizational skills, he completes the project of the cartographic set up of Greece. The cartography of Greece was expanded with scientific efficiency and skillful art, the Service from 1919, acquires independent printing capabilities within the Cartographic Service, while retaining the Austrian know-how, which marked the cartography of the country, on the way to the Epic of 1940 war.


The project of the Mapping of Greece (1962-1989)

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The culmination of the cartographic experience.

The year 1962 is a milestone in the cartographic course of Greece. The organizational structure of the Hellenic Military Geographical Service (HMGS), as well as its scientific excellence, enables the Service to undertake akey national project for the development of the Country:the production of colored map sheets of 1:25,000 scale, for the local regional development and reconstruction of the Northwestern Peloponnese area. The compilation of the maps provided for the photogrammetric method from recently taken aerial photographs with revision of these in the field and the acquisition of new ones where necessary. The reduction scale was set at 1:10,000 and whenever there would be a need for essential works for the establishment of a cadaster, the reduction was set at a scale of 1:5,000.

Initially, the project was assigned to the Service by decision of the Ministry of Coordination, for the preparation of essential maps of the Peloponnese and the islands of Kefalonia, Zakynthos, Ithaca and Kythera. The first positive results led to the subsequent undertaking of the project Mapping of Greece through Public Investment credits. This project ultimately resulted in the coverage of the entire Greek territory with topographic diagrams 1:5,000, an issue of great importance for the country’s development, as they formed the necessary background for the preliminary study of any technical project, as well as the basis for the compilation of cadastre (forestry, viticulture, olive growing, etc. ) by the Ministry of Agriculture.

From that moment on, the Service's course took a creative and renewedpath, with an unprecedented increase and renovation of its scientific equipment and personnel. At the same time, the Country’sbasic networks expanded both in point density as well as in accuracy. By 1988, the mapping covered a territorial area equal to 85% of the total surface of Greece.


Computer Center

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The entrance to Geoinformatics

Ever since the 1970s, the Hellenic Military Geographical Service (thereinafter called HMGS), has been using computer systems to calculate the coefficients of the regular equations of the 1st order network of mainly Eastern Greece. In the Triangulation Department and the HMGS Informatics Sub-Directorate, resolving the first order network, was a time-consuming and very demanding task, due to the equations using the method of conditions (only for the 1st order network), since the matrix inverse, was created manually.

Ultimately, resolving a system of 153 equations for the 1st order network, and in particular the inversion of the regular dimensional matrix, was an extremely difficult computational task, whichtook approximately six months to calculate manually. The use of the UNIVAC computer system and the subsequent transfer of the code to the first modern computer PRIME 550 of HMGS was a key step to resolve networks in minimal time as compared to the calculation through the use of a basic calculator.

The installation of the PRIME 750 system, granted by the National Center for Scientific Research Demokritos, as a loan to HMGS, established a competent computer interface and one of the most powerful systems in Greece at that time. The primary programing language used was Fortran and all the programs for calculating networks of the 1st class and lower classes were created by the creation of programs by the Greek General Staff, with a tremendous shortening of the calculation time, mainly the time of inversion of the normal matrix of the 1st class network from 6-7 months to a few hours.

In 1983, the GIS entered the world of Geographic Information Systems as the first country in the Balkans and among the top 10 worldwide, with the procurement of the ARC - INFO software version 2 of the ESRI Company. The first installation of the system was on the Prime 550 computer with the Primos operating system and with a central memory (RAM) of 1 MB. Further on, the HMGS computer system was gradually upgraded, through the acquisition of ma larger central memory (4 GB) and a faster CPU. In the years to come, the information infrastructure expanded with the development and installation in 1986 of an automatic mapping and digital information processing system, aiming at improving the productive cartographic process and developing the automatic processing of geographic information. This system consisted of a new computer (PRIME 9650) with the necessary magnetic disk and tape units, two digitaldata entry banks, two graphic screens for map representation and digital data processing and an automatic drawing bank (PLOTTER), with the ability to draw and engrave on reproduction plastic.

In 1988, the ERDAS automatic satellite image processing system was installed, for the utilization of SPOT and LANDSAT satellite images, in terms of collecting information for the benefit of the Armed Forces and supporting the map revision process. This system was equipped with an appropriate communication section (interfacemodule) for communication to and from the ARC - INFO system.


1:50,000 scale maps


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The Basic Mapping Scale (1:50,000)

Starting point and evolution

During the post-war reorganization of HMGS, which started in 1945, the main goal set, was to continue the mapping the country on original 1:20,000 scale plates. Since the pre-war period, mapping had covered a large part of the Greek territory from the country's borders to the Gulf of Corinth. The above goal decreased in 1951, due to the work of the US Geographical Service that carried out the aerial photography of the entire country in 1945.

From the summer of 1952, the first and primary post-war cartographic project began to cover the entire Greek territory with 1:50,000 scale maps. This project provided for the on-site review of the Photo -topographic signs constructed by the US Cartographic Servicewhich had carried out aerial photography of the entire country at a scale of 1:42,000,in the field by HMGS personnel, The US Service began in 1950, the production of the topographic map of Greece at a scale of 1:50,000 and published by 1955 the first series of maps (1st edition) under the name AMSM 708. This series included 387 map sheets of Latinterminology. For the production of this scale, the US Cartographic Service used the HMGS’ geodetic and cartographic framework (until 1940), carried out the aerial photography of Greece of 1:42,000scale, the aerial triangulation of unknown methodology for the photogrammetric reduction, as well as supplementary data (cartographic and field) from HMGS and US personnel working in Greece that time. Through the use of all the above data,the US Service produced, in an unidentified way, the original prototype materiel of the 1st edition, which following the printed maps,was sent to HMGSin carton boxes, during the period 1952-1955.

The series of aerial photographstaken in 1945were obtained by HMGS in 1949 and their management through respective detection on maps, started in 1950. The revision of the maps was imperative, only due to the maps’ defects, inaccuracies andmisinterpretation of the aerial photographs. Thus, the original reproduction materiel (film for all colors) was revised through, on field works and the original reproduction material of the 2nd edition maps was manufactured during the period 1953-1965. The revision started in 1952 by the Peloponnese region for 25 map sheets and carried onsteadily up to 1961. The work carried on,in the office with the composition and artistic design of the maps which was finally finished in 1966 and essentially led to the first edition of the 1:50,000 scale F.X. with work by the GYS (2nd edition). Within 15 years, the country had acquired for the first time a basic cartographic background of nationwide coverage at the basic scale.

From this time on, the original map reproduction material of the previous edition was revised, thus comprising the reproduction material of the next edition of the M708 series maps. By 1987, the 4th series had been published and the 5th and 6th editions were in progress, of which 200 and 6 F.X. had been printed respectively. The GHS was based on the original map reproduction materials of the 1:50,000 scale to complete and print all other maps of the 1,100,000, 1:200,000 and 1:400,000 of scale.

In 1953, the Service initiated the division of the country's geographical areas referring to Greenwich Meridian, instead of the Athens Meridian. At the same time, the use of the Mercator Graticule started, instead of then use, of the Mediterranean Graticulefor map publications.

Nowadays, HMGS continues revision of the 1:50,000 scale topographic maps, to meet the operational needs of the Armed Forces, as well as to serve the wider public (General Use Maps), with priority given to sensitive areas for national defense and security purposes. At the same time, it plans and is about to implement imminently, the complete transition of the process of collection, processing, composition and artistic design of the basic scale through the use of a holistic application of the Geographic Information Systems technology.


Geodetic-Geophysical works (1980-1990)

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Geodetic-Geophysical works (1980-1990)

The introduction of new methods and technology

The period from 1982-1986 is characterized by the introduction of new measurement methods and the creation of new stations for geodetic, satellite and astronomical observations.

Regarding the trigonometric network and in particular the 1st order trigonometric network, which consists of 137 points, 720 goniometric measurements, 17 lateral measurements with special geodetic instruments were carried out. AGA and measurements at 20 Laplace astronomical stations. A part of the 2nd order network was re-measured, while the observations of the lower order networks were completed. The astronomical observations were carried out with WILD instrumentsT4, astronomical theodolites and LONGINESchronographs.

In the field of satellite geodesy, Doppler measurements were carried out at 56 stations distributed throughout Greece, most of which were trigonometric 1st order. The Doppler program was an innovative application of the interdisciplinary cartographic services of the USA, in the period 1971-72, for determining the geographical position of points on the earth's surface in 3 dimensions. After its control and evaluation, the results were deemed satisfactory for geodetic and cartographic purposes and its global application was implemented with the production of approximately 1500 geodetic receivers.

The purpose of the above measurements in Greece was to calculate the displacement parameters for the conversion from the ED 50 geodetic system to WGS 72 and vice versa, with the aim of connecting the country's trigonometric network with the European trigonometric network, as well as to determine the position of points with an accuracy of 0.5 meters on 15 rocky islets of the Aegean and Ionian Seas, which could not be determined by classical methods. The instruments used were 4 MX 1502 receivers, two from the National Geodetic Survey and two from the National Technical University of Greece. The zero-order Doppler network consists of 4 stations, while the 2nd and 3rd order networks consist of 10 and 44 stations respectively.

During the same period, the Service participated in the WEGENER - MEDLAS program as an active member. The purpose of the program in question was the study and determination of the micro-movements of the tectonic plates of the solid crust of the earth and in the long term the prediction of earthquakes in our country and in the wider region of the eastern and central Mediterranean. Since 1984, 6 stations have been selected in Dionysos, Crete, Peloponnese, Epirus, Thrace, at which permanent observation stations (specially constructed concrete platforms) were established and satellite measurements were carried out ( LACEOS , STARLETTE satellites) with portable laser systems , to determine the position of the instrument with an accuracy of 1-2 centimeters. From the repetition of the measurements at regular intervals, a model of current kinetic behavior was obtained from which the relationship of deformations emerged. In June 1987, 5 GPS receivers were used to connect the WEGENER platforms to the state trigonometric network.

The measurements were carried out in collaboration with the Universities of Athens, Newcastle and Delft and took place simultaneously on each platform and on the triangular sites in the surrounding area. The purpose of the longitudinal measurements (every two years) was to determine the micro-movements between the triangularpoints and each platform.


Trigonometric Network of Greece

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The triangular Network of Greece.

The evolution of the country's geodetic framework.

The establishment of the HMGS initiated the creation of the country's geodetic infrastructure through the Geodetic Detachment. By 1918, the primarytriangularnetwork was developed, covering the entire area of the then liberated Greece, extended to the old boundary line north of Larissa. Following the victorious Balkan Wars, the old trigonometric network was extended to the new boundary line.

This network hadits base on the trigonometric pedestal of the Athens Observatory and the single base in Elefsis (ThriasionPedion). The calculation of the geographical coordinates was carried out on the basis of the Bessel ellipsoid. The section measured in 1889-1905 was implemented provisionally, whilstthe section measured in 1918-1925 was completed, by use of the method of minimal squares. At the same time, works werecarried out on the 2nd order network as well as the densification networks. As a result, by 1925 a number of 2130 trigonometric points of various orders were established and determined.

From 1925 and onwards, strenuous efforts were made to install, measure and calculate a better primary network and for this purpose Greece was divided into three arcs, the Central, the Eastern and the Western. By priority, the measurements were carried out on the Central arc, which was also part of the chain of triangles extending from the North Sea to the Cape of Good Hope (StruveArc).The network was calculated through the use of the Least Squares Method (LSM), on the Bessel ellipsoid, with three consecutive base sides in Eleusis, Larissa, Crete and three Laplace points, on Mount Voras (Kaimaktsalan), Larissa and Crete. From the central arc, the extension to the East and West as well as three additional bases with corresponding Laplace points were measured. By the end of 1939, the country's trigonometric network of 160 1st order points, 320 2nd order points, in total the entire network numbered about 4500 trigonometric points. This network was connected to Yugoslavia, Bulgaria and Turkey.

Since 1949, in the context of the reconstruction of the Greek State Survey, a study of the state trigonometric network was carried out almost from the beginning, since the pedestals of the trigonometric points had been destroyed by more than 30% and the entire archive had been destroyed by the occupying forces. Thus, the 1st and 2nd order network was re-measured, while at the same time a relative densification was implemented using methods that met the requirements of cartographic accuracy for the needs of the Greek State Survey, but did not meet the required specifications in terms of the use of instruments, triangle closure error and methods. This first revision was completed in 1962.

In 1962, HMGS undertook the project of the Mapping of Greece at 1:5,000 scale and at the same time, the revision of the 1st and 2nd order trigonometric networks partially restarted,along. withthe establishment of the 3rd and 4th order networks. The new measurements for the 1st order network were completed in 1979, at the time when the recalculation of the networks commenced. In 1981, the first geometricnetwork repair, was finalized with a single base side (Ktypas-Parnitha). In 1984, the calculations continued and a new network repair .was completed through the use of 17 base sides and 14 Laplace azimuths. In 1986, the calculation of the 1st order network was revised with a newer solution, better theoretically substantiated, so with this fixed solution, the calculation of all 2nd, 3rd and 4th order networks was realized. By 1987, several areas of Greece were re-measured and the measurements of the lower order accuracynetworks were also completed. The final calculation of all networks was concluded in February 1989.

By September 1989, the height calculation of the trigonometric points was also completed. The correction was formed by large units (one or more 1:50,000 FG). In each one, the height of a sufficient number of points with an accuracy of 1 cm had been calculated with geometric spatial adjustment, depending on the country's spatial adjustment network.

In parallel with the calculations in the Greek datum (in the Bessel ellipsoid ), the calculation of the 1st and 2nd order networks in ED 50 was carried out with the same methodology, for the needs of theHellenic Armed Forces, as well as other services. The geodetic coordinates were calculated by the 1st order trigonometric Ktipas, with an azimuth, to the 1st order trigonometric in mount Parnitha. The 3rd and 4th order networks in ED 50 were calculated by transformation.

In 1986, a new geodetic reference system and a new cartographic projection were proposed by the Professor Georgios Veis of National Technical University of Athens (NTUA). This new system utilizes the GRS 80 as an ellipsoid and the central pedestal of the satellite monitoring station in Dionysos, Attica, as a starting point, in which the “φ, λ, ξ, η, N” were calculated. This datum was chosen to minimize the deviations of the vertical in the Greek mainland. Furthermore, the transverse mercatoric projection was chosen in one zone, as a single cartographic projection for the entire country.

The national trigonometric network, implemented by the Greek National Reference System 1987, consists of 137 1st order points, 475 2nd order points, 3903 3rd order points and 21187 4th order points, with an average density of 1 point per 5 square kilometers.

With the advent of satellite technology, HMGS, on the basis of the same platforms, created a network of 201 triangulated points, determined by satellite observations in ITRS. This network was called HEGNET 2002 and in addition to the triangulated points, it also includes points of the WEGENER program, tide gauges and geodetic platforms.


Geomagnetic Network of Greece

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Geomagnetism in​ Greece​

The primary magnetic observations in Greece pertain to the Hydrographic Officers of the British and French Navy, who were involved in the hydrographic survey of the Greek coasts. However, these observations were not systematic,limited and not interdependent. Further on, the inclination and the horizontal component were not taken into account, as these elements were not in the area of interest of the Marine community.

Therefore, these elements were scientifically inaccurate. The magnetic declination curves were approximated, due to the fact that the distribution of terrestrial magnetism in the Greek area was considered almost unknown until the 19th century.

The first scientific efforts by the Council of the National Athens Observatory,of the researchdistributionof terrestrial magnetism in the country, dated back to 1895 with the recommendation to create a magnetic station. In 1898, the Ministry of the Navy installed a warship compass compensation station at the Salamis Naval Station and purchased specific instruments for measuring the absolute values of magnetic elements and established a geomagnetic station to study the variation of these elements.

For this purpose, aspecific pavilion was built on the hill of Nymphs,close to Athens National Observatory, which was completed in 1899, whilst around mid-1898, a theodolite for measuring absolute values and a series of instruments for measuring variations were also purchased. From 1899 and for nine consecutive years until 1908, the magnetic station operated continuously. However, the observations referred to the Athens area only, so it was impossible to compile a magnetic map of the country due to the lack of observations in other parts of Greece. The first observations outside Athens began in 1907. In the context of hydrographic surveys in the coastal areas of Thessaly and Sporades, magnetic data were calculated at six points. In 1909, the then Ministry of the Navy, following the proposal of suggestion of Lt Commander Matheopoulos, procured a portable magnetic theodolite.

In 1919, the Hydrographic Service Directorate was established, tasked to carry out hydrographic surveys. One of its missions was the study of terrestrial magnetism. Until 1925 and for six years from 1919, the deviation was measured in 80 stations in Greece, and in most of them, the dip and the horizontal component.

In 1926, two officers of HMGS were trained by the Hydrographic Service and at that period, 31 magnetic stations were measured, thus resulting in the compilation of the first temporary magnetic map of the country, which provided the curves of equal deviation per ¼ of a degree from the existing observations, paired with the curves from English maps of neighboring areas.

The absence of the magnetic scope, the operation of which had been discontinued in 1903, led to serious problems in the reduction of the calculated data and the calculation of the constant errors of the theodolite used.

In 1927, the HMGS, in scientific cooperation with the Hellenic Hydrographic Service, procured a new theodolite, as well as a standard type Sartonius magnetometer for the calculation of absolute values. The acquisition of these instruments, especially the portable theodolite, enabled a more systematic study of the stationdistribution, to be spaced 50-100 kilometers apart, thus e increasing the capability to perform measurements at more stations annually. Therefore, in cooperation with HMGS, the number of observations increased to 42 stations annually in 1929 and 1930 and to 101 in 1931.

In 1932, the first official geomagnetic map of the country was initiated, which contained the equal declination and equal inclination curves of the Greek territory and the surrounding seas.

The magnetic scope building was finally completed in 1934,on a terrestrial areaof 1500 square meters in the area between Menidi and Tatoi airport, to the northwest of the airport and at a distance of approximately 1000 meters from the air base facilities.

The foundations for a complete geomagnetic network were laid in 1972, with the establishment of 54 stations throughout the country. Since 1980, the stations have been compressed and nowadays, the geomagnetic network has 108 points distributed throughout Greece.


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The relief terrain department was founded in 1931 with the mission to construct reliefs for military purposes (teaching terrain morphology, etc.), illustrating historical events and for other scientific purposes, technical studies, etc. Itconsisted of three civilian personnel and a Chief Officer.

By 1935, 20 basic reliefs had been constructed. For their construction, in addition to the common work that included the map delivery in plastic form and studying historical sources and reports, the on-site presence of a specialist technician in the area to be delivered, was required so as to .to form a direct perception of the area and produce, in the best possible way, the colors of the soil and crops, as well as, where possible, aerial observation from an aircraft, in order to form a visual perception of the area.

In particular, the following reliefs were constructed:7 battlereliefs (Sarantaporos, Giannitsa, Ioannina, Kilkis- Skra , Battle of Lemnos, Battle of Greece), 7historic reliefs .,

7 ancient battlereliefs ( Thermopylae , Marathon, Plataea , Battle of Salamis, Sphacteria, Monasteryof Agia Lavra, Monastery of Arkadi),2 military exercises reliefs (PediouCharvati for Artillery, PediouGoudi for Engineering),3 general topographic Relief Map of the Balkan Peninsula 1:1,000,000, a Relief Map of Greece 1:500,000, Relief Maps 1:100,000 of Nigrita, Drama, Serres, Rodolivos and one . geological theme of Santorini Island with a representation of lava eruptions.

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