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The paper presents experimental results of ridge and valley analysis carried out by automated LESSA (“Lineament Extraction and Stripe Statistical Analysis”) software. Digital terrain maps of a wide range of regions of the Earth were analyzed in a wide range of scales. Results showed that summary ridges and valleys length grows linearly with the increase in scale (increased resolution). This may be due to the fractal feature of terrain. In order to obtain reliable measurement of the direction of ridges and valleys an additive threshold value for the concurrency of ridges and valleys was experimentally determined. Mean orientation of the different size (scale) relief elements orientation were compared. Sometimes small data scale changes lead to significant change –“jump” – in orientation. After analysis of a large range of terrains, “special scales” were found, for which this “jump” occurred much more frequently than for other scales. It is possible, that this result shows that sizes of tectonic structures are discrete, which was proposed in  a number of publications. It is important to note that these “special scales” were found as a result of automated  analysis and that technological parameters of measurement do not influence this general result.