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The royal castle in Kaliningrad cannot be restored without the original negatives of his photographs

The royal castle in Kaliningrad cannot be restored without the original negatives of his photographs. There are no such materials in the capital of the Russian exclave, said a representative of the St. Petersburg team, which was entrusted to restore the Königsberg citadel. The original negatives of old photographs are needed to measure the castle.
“So far we have not been able to obtain sufficiently high-quality material for the Konigsberg castle,” said Alexander Voinarovsky, general director of the Photogrammetry research and production enterprise. “And the quality material for photogrammetry is originals, negatives.
Old photographs of the past and of the last century, as a rule, were taken on glass, with a large-format camera. These plates are the best source material. They are scanned on a special photogrammetric apparatus, according to certain rules. Due to this, it is possible to guarantee not only a high-quality picture, but also accuracy. That is, the fact that the graphics of the object correspond to its real geometrical parameters of these unique castles. "
Voinarovsky illustrated the problem with two photos of the Royal Castle. The expert called it a stereo pair. With the help of a special program, he made a three-dimensional image of the Koenigsberg citadel.

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