-— [Aa
One of the centres of archeological aerial photo inter-
pretation is the Hungarian National Museum. So far,
significants results have been achieved in a research
project involving the earthwork trenches discovered in
the Great Plains. As thelr greater part had been comple-
tely destroyed, a considerable section of about 120 km
in length could be detected only by aerial photographs.
At the same time another trench System was excavated in
the western part of the country, on which rather un-
certain historical data had been available so far. Here
aerial photographs taken at a flying height of 5000 to
4000 m were used, which revealed the 12 to 20 m wide
trench lines quite clearly, illustrating the ploughed-in
banks in the form of light soil Strips whereas the for-
mer trenches as parallel dark lines.
Such photographs have been similarly exploited with much
success in other archeological projects as well, like in
searching for the county seats of the 11th centruy,
represented by 2-3 ha area earthwork fortifications that
time. Their complete trench system could be clarified by
these photos. The same method was adopted in looking for
the original site of the village settlements belonging
to the county capitals.
Significant results have been achieved in the hilly
regions where the thinner humus layer did not cover
completely the archeological traces. Many findings could
be discovered through aerial photographs, such as the
tombs and graves in Szâszhalombatta, or the wall ruins
of the Roman turret near Hatvan, buried a long time ago,
etc.
3. Photogrammetric research in Hungary
As fundamental research institutions in Hungary, two
establishments can be mentioned in the field of photo-
grammetry: the Institute of Geodesy and Geophysics,
Sopron, of the Hungarian Academy of Sciences which is
dealing mainly with theoretical research problems, and
the Surveyor Institute of the National Land and Cartog-
raphy Office which is the authority mainly of applied
research projects. Research is carried on, furthermore,
by certain university and college departments, geodetic
and cartographic enterprises, and some specialized
organizations.