USE OF AEROTRIANGULATION RESULTS FOR MODEL SET UPS ON 
KERN ANALYTICAL STEREOPLOTTERS 
K.A. Grabmaier 
International Institute for Aerospace Survey and Earth Sciences (ITC) 
Abstract: 
After the adjustment of aerotriangulation data acquired either by the 
Independent Model Method or by the Bundle Method, the data required for 
model orientations are known. 
If analytical stereoplotters are used for the restitution, the model orien- 
tation can be accomplished by measuring the positions of the fiducial marks 
only. However, if the adjustment is based on Independent Models measured on 
analog instruments, the model orientation data are incomplete and/or 
inaccurate. 
Procedures and programs have been developed at MARKHURD Corp. to allow a 
fast setting up of models in the KERN DSR stereoplotters after aerotrian- 
gulation adjustment using the PAT-M or the PAT-B program. This paper 
describes the method used, discusses the advantages of the approach and 
reports about the first experiences obtained in real production. 
Introduction 
In addition to other equipment, MARKHURD Corp. uses KERN DSR-1 [2,4] and 
DSR-11 [3,4] analytical stereoplotters for the execution of most of their 
photogrammetric work. 
Aerotriangulation adjustment programs (PAT-M43 [1] and PAT-B [5]) have been 
installed on a VAX-780 computer and there is a serial line connection be- 
tween the VAX-780 and the main processor of each of the DSR’s. In-house 
produced software has been used for file transfer, but this has probably 
been replaced in the meantime by software from DEC. 
In order to reduce the time spent on model set up in the KERN DSR 
stereoplotters, software has been developed to replace the orientation 
process by an a priori computation using the aerial triangulation results. 
The time spent on the orientation process in analytical stereoplotters is 
often regarded as being negligible. However, this is often not the case in 
practice, for various reasons. Especially if stringent accuracy require- 
ments have to be met, several re-measurements may be necessary. Also 
valuable time is lost if the operators try to obtain unrealistically small 
residuals or have to search for points which are difficult to find. 
Outline of the concept 
  
After performing aerotriangulation data collection on one or more of the 
DSR stereoplotters, the observed photo- and/or model coordinates are trans- 
ferred to the VAX-780 together with any other information needed. 
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