al 
om 
Data Collection for Bundle Block Adjustment 
on Analytical Plotters 
Karsten Jacobsen 
University Hannover 
FR of Germany 
Commission III 
Introduction 
Program for Data Collection 
Experiences,in Data Collection 
Experiences with Block Adjustments 
Need of Online Triangulation? 
Cn .» co P5 +— 
1. Introduction 
Up to two years ago, the photo measurements for bundle block adjustment of 
the University Hannover have been done with comparators. The measurements 
have been time consuming and no online check was possible. Caused by this, 
a photo arrangement of 60 % endlap and 20 % to 35 % sidelap was used and a 
lot of blunders have been included in the data. In addition, the reliabili- 
ty of the computed object point coordinates was poor, because of the small 
number of photos for each object point. 
Now the use of modern analytical plotters has changed the data coilection 
and this also has influenced the block constellation. If a point was 
measured in a photo or model, this information can be used for an automa- 
tic accurate or approximate pointing in other photos or models. So the 
use of photos with a higher overlap will raise the time for data collection 
not so much. 
The topic of this paper is only the data collection for high accurate 
bundle block adjustments. That means, the object points are signalised or 
they are well defined topographic objects. 
2. Program for Data Collection 
The advantage of analytical plotters is depending upon the software. Usual 
the standard software is limited in the possibilities. By this reason, a 
program for supported measurement of photo coordinates for bundle block 
adjustment was made for the Zeiss Planicomp with the computer HP 1000. 
This program has following main possibilities: 
- measurement of fiducial marks or reseau points with automatic approxi- 
mate pointing; 
- measurement of photo points, partially with approximate or accurate auto- 
matic pointing; 
- optional second measurement of the photo points in reverse sequence; 
- second measurement of fiducial marks or reseau points; 
- computation of relative orientation including statistical tests and 
transformation of the model to the approximate computed block. 
Only numbers of points which have not been measured before or for which no 
approximate position is available, have to be typed. 
The fiducial marks or the reseau points are numbered corresponding to 
their location in the camera. That means, the same fiducial mark can be 
sometimes on the left hand side and sometimes on the right hand side in the 
analytical plotter, depending upon the flight direction of the individual 
strip. The automatic numbering will be done corresponding to the answer to