coordinates, fictitious data are no substitute for actual photography. 
Consequently, the results summarized here should not be interpreted as being 
directly applicable to practical mapping problems. 
The least squares adjustment, performed for relative orientation of each 
triplet, allows evaluation of the plate coordinate measuring residuals and the 
std. error of unit vt of the adjustment for each triplet. This capability 
permits an editing procedure to be incorporated in the computer program which 
enables detection of inconsistencies in the relative orientation. If the 
inconsistency is caused by a blunder or blunders in plate coordinates, 
examination of the plate coordinate residuals then allows elimination of the 
bad point or points. In this way points affected by blunders can be removed 
before the aerotriangulation procedure progresses farther and produces biased 
results for the entire strip. A similar procedure could be followed to permit 
elimination of all points having random errors greater than a pre-selected 
rejection criteria. In the latter case, caution should be used. Elimination 
of too many points may result in a sufficient loss in redundancy to cause the 
solution to deteriorate rather than improve (Test Case 13)* Further testing 
with several sets of data in which random errors have been introduced are 
necessary to evaluate the last two features more thoroughly. 
The cantilever extension (Test Case 10 Random Set 1, o = 0.05mm) was 
designed for the specific purpose of having a test run to compare with a 
Q 
similar cantilever extension performed by the Herget method"^ in which the 
same data, were used. The resultant mean square errors of position in the 
geocentric coordinate system for the cantilever extensions by the triplets 
procedure and by the Herget method^ were 99*^1 and 251.26 feet respectively. 
This large decrease in the resultant mean square error is a good indication 
of the strength added to the cantilever as a result of employing the triplet 
as the basic unit. However, it should be noted that although the Herget 
test case represents use of the stereopair in a cantilever extension,