—1244. — 
The new COORD D transformation program written by H.MOHL for 
the model 9815 desk calculator by Hewlett Packard makes exact 
allowance for photograph tilt. This again improves accuracy in 
the test model by about the factor 5. The rms error of terrain 
coordinates is around 1 m. The corresponding arrows in Fig. 4 
are too small to be plotted. 
Calculating accuracy could be further improved by digitizing 
the y-parallax in the STEREOCORD in addition to the x-parallax. 
While this is possible with the aid of a suitable accessory, 
the higher calculating accuracy can only have a marginal effect 
because in the case of COORD D the calculating accuracy is of 
identical magnitude as the pointing accuracy attainable in the 
machine. 
5 Re ferences 
1  H.-K. Meier, Bildm. u. Luftbildwesen 3/1971, 131-133: Der 
Stereo-Róntgenkomparator StR 1-3. 
2 R.B. Forrest, Phot. Engineering 37 (1971), 847-853: Image 
Space Plotter. 
3 R. Brun, Forest Management Institute (Canada) Information 
Report FMR-X-41 (1972): A new Stereotope-Digitizer system 
for measuring and processing data from large-scale aerial 
photographs. 
4 C.N. Thompson, Report ETL-TR 74-2 (1973): Analytical 
Photogrammetric Positioning System (APPS). 
5  J.G. Armistead, Report ETL-TR 74-4 (1974): Analytical 
Photogrammetric Positioning System (APPS) to support 
the field army. 
6 D. Hobbie, Photogrammetric Record 8 (47), (1976),563-582: 
The ZEISS G-2 STEREOCORD: A simple stereoplotter for 
computer supported plotting. 
7 H. Finke, H.W, Faust, Vermessungswesen u. Raumordnung 39 
(1977), 225-241: STEREOCORD G-2 - Anwendung in der 
Planungspraxis. 
8 A.H. Aldred, J.J. Love, Forest Management Institute (Cana- 
da) Information Report FMR-X-107 (1978): Application of 
Large-Scale Photos to a Forest Inventory in Alberta. 
Date of preparation 
20.05. 1978