The purpose of this study is to establish the contouring accuracy when using secondary order instrument (Multiplex) .
For checking the contouring accuracy, spot heights were measured on the some models at 930 points, by the highest class operator, using Multiplex.
Checking results of the contouring was analyzed on the skill of the operator, position in the model, the tone of the photographs, the characteristics of the landf orms and the others. A11 these data was discussed quantitatively and pualitatively.
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