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C. ANALYTIC TRIANGULATION PROCEDURES TESTS 
The procedures tested are divided into two general groups: (1) simultaneous 
adjustment of photographs; and (2) sequential adjustments. Participants clas- 
sified according to these major groups are: 
  
Group 1: Sequential Adjustments 
. National Research Council of Canada 
. Institut Für Angewandte Geodäsie and Universität Stuttgart 
. University of Wisconsin 
." Pacific Aero Survey Co. Ltd. 
. Asia Air Survey Company 
.. Kokusai Aerial Survey Co., Ltd. 
JU Toyo Aero Survey Co. Ltd. 
- OS US D Co h2 FH 
Group 2: Simultaneous Adjustment of Photographs 
  
8. Helsinki University of Technology 
9.. United States Army Topographic Command 
10. DBA Systems, Inc. 
Procedural characteristics and results obtained by individual participants 
classified and numbered as above are tabulated and summarized in subsequent 
sections. First consider a brief resumé of details of the respective major groups 
of procedures. | 
1. Sequential Adjustments 
  
These adjustment procedures consist of analytic: 
(a) relative orientation of individual basic units* in arbitrary space coordinate 
systems. 
(b) assembly of basic units into a common coordinate system [note that (a) and 
(b) may occur concurrently]. 
(c) adjustment of the assembled system to known control points. 
Approaches for sequential procedures are categorized according to the type 
of condition utilized in relative orientation, size of basic unit, method of 
unit assembly, degree of equations employed, and method of basic unit assembly. 
These characteristics are simmarized for Sequential Adjustments in Table 1l. 
2. Simultaneous Adjustments 
  
This group includes procedures in which the desired parameters are adjusted 
using a direct simultaneous least squares adjustment of the block. Estimates 
are required for exposure station positions and orientations plus estimated 
coordinates for all object points. 
Procedural characteristics for simultaneous methods are listed in Table 2. 
  
*In this report basic.unit is used to describe the traditional stereopair.