Automatic Scree Placement for Topographic Maps

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Summary

The production of scree presentation for high-quality topographic maps is an extremely labour-intensive task when each stone is drawn separately. This is due to the large number of stones, which reaches 720 or more points per square centimetre on a sheet at a scale of 1:25,000 by swisstopo. This project will identify the theoretical guidelines that were developed for scree representation in the pre-digital era. The guidelines will be compared to current map sheets of swisstopo that are updated digitally, but with scree still being drawn in a traditional stone-by-stone technique. The project will identify and formalize geometrical and graphical properties of scree presentation, such as the diameter and density of stones, the modulation of density with illumination, the modulation of size with illumination and slope, and the shape of stones.

The main goal of this project is the automatisation of scree presentation by developing a new algorithm that automatically generates scree presentations in the quality of hand drawn presentations. Problems that will have to be tackled are the variation of stone density with illumination, the arrangement of stones according to slope lines, the detection and solution of graphical conflicts to avoid overlapping between stones and other map elements, and the generation of stone shapes that vary in a pseudo-random manner.

Project period

12.09.2007 – ?

Researchers

Lead: Hurni, Lorenz
Internal: Jenny, Bernhard Jost. Hutzler Ernst.

Funding source

Public institutions (e.g. federal offices)

Partner

Federal Office of Topography swisstopo

Web

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Publications

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