8 
coordinates also the direct influence of the systematic errors has to be 
taken into account. For such purposes diagrams of the direct influence 
of the systematic errors can be constructed for different overlapping 
conditions. Then the total influence is found from the same procedure 
as was demonstrated above. The accuracy of the determination of the 
total influence can easily be determined if the accuracy of the determi- 
nation of the systematic errors is known. For a complete investigation 
of the accuracy of the final data of the model, the measuring errors of 
the y-parallaxes and of the model coordinates must also be taken into 
account, 
From the results of the investigations above, it is quite obvious that 
the relative orientation always has to be kept in mind when systematic 
errors of the model are being investigated. 
References 
1. Bean, Russel K.: Source and Correction of Errors Affecting Multiplex Map- 
ping. Photogrammetric Engineering 1940. No. 2. 
2. Tham, Percy: Lens Distortion in Photogrammetry. IVA handlingar No. 185, 
Stockholm 1946. 
3. Hallert, B.: Über die Hersteliung photogrammetrischer Pläne. Diss. Stock- 
holm 1944, 
4. — Über die Fehlertheorie der Aerotriangulation und einzelner Bildpaare. 
Zeitschrift für Vermessungswesen, 1955, 10 and 12. 
5. — Über die Genauigkeit der Luftphotogrammetrie. Transactions of the R. 
Institute of Technology. Stockholm 1956, No. 99. 
6. — A New Method for the Determination of the Distortion and the Inner 
Orientation of Cameras and Projectors. Photogrammetria 1954— 1955, 3. 
Schwidefsky, K.: Grundriss der Photogrammetrie, Stuttgart 1954.