In all cases GEOSCAN employs the same adjustment algorithm. Therefore a user
has to learn the program only once and will be able to compare different types of
networks satisfactorily.
GEOSCAN consists of four main modules (figure 1).
PREPROCESSOR
LEAST SQUARES/STATISTICAL TESTS
— mem —
men 220) a
PRESENTATION/ANALYSIS
CALCULATION DF TOPOGRAPHIC POINTS
Figure 1: Main structure of GEOSCAN
3.1. The preprocessor
The preprocessor is a users-friendly interactive module which creates, controls
and manipulates the inputfiles, needed for the adjustment. Therefore these files
are computable in the adjustment step causing neither singularities in the normal
matrix nor uninterpretable data-snooping results. Since all input and configuration
errors are detected interactively in this preprocessor a considerable reduction in
editing-time can be obtained. Figure 2 shows the structure of the preprocessor.
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