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Å UMARSKI LIST 8/1954

Å UMARSKI LIST 8/1954

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LITERATURA:1. Daniel R.: La photogrammetrie appliquee ä la topographie Paris 1952.2. Moessner K.: The accuracy of stand-height measurements on air photos, Ohio 1950.3. Hugershoff R.: Die Bildmessung und ihre forstlichen Anwendungen (Der deutscheForstwirt), Berlin 1939.4. Schwidefsky K.: Grundriss der Photogrammetrie, Bielefeld 1950.5. Shorp H. O.: Practical photogrammetry New York 1951.6. Spurr S. H.: Aerial photographs in forestry New York 1948.7. Tomašegović Z.: Osnovi fotoigrametrije i aerofototaksacije Zagreb 1950..8. Tomašegović Z.: O pouzdanosti aerofototaksacije za neke dendrometrijske potrebešumskog gospodarstva (disertacija predana za štampu u XII. knjizi Glasnika za šumskepokuse).9. Zeller M.: Traite de photogrammetrie, Zürich 1948.10. Wodera H.: Die Holzmassenermittlung nach Luftbildern (Allg. Forst- und holzwirtschaftlicheZeitschrift, Wien 1948).SummaryIt is necessary, in the interest of a more exact interpretation of the formulaA/j = — Ap x in stereoskopic measurements of tree heights, to reduce the flying heighth and the base length b' numerically to the same level, i. e. to the level of the stationin which the tree heights (see chapter / 7-5) are measured.Bj> using the parallax bar (Zeiss-Aerotopo) we obtain the mean error for a singleobservation [i I = ± 1/—— I = ± 2,6m\ and by applying the parallax wedge(constructed on a transparent „Astralon" sheet) we obtain \a= ± 3,4 m-Using the parallax wedge we obtain a systematic error of —3.7, m (the firstinterpreter) and of —2,1 m (the second interpreter). These errors were taken into considerationin the computation of the above mentioned mean error for parallax wedgeINSTITUT ZA ŠUMARSKA I LOVNA ISTRAŽIVANJA NRHU ZAGREBUraspisuje natječaj za upravnike osam šumsko-pokusnih stanica: Osijek,Požega, Bjelovar, Petrinja, Gospić, Fužine, Rijeka, Benkovac, i za saradnikazaštite šuma na stanici Rijeka. Plaća po Uredbi, doplatci premainternom pravilniku instituta. Nastup po dogovoru. Potanje informacijeu institutu (Ul. Socijalističke revolucije 15).Molbe s biografijom i opisom stručnog rada slati na adresu instituta.Uslov: stručni ispit i solidna praksa u uzgajanju šuma. Prednost:reflektanti s poznavanjem stranih jezika.401

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