Abstract

Multi-scale maps are one of those which are produced and displayed on screens at different levels of scale. Therefore, multi-scale mapping needs new approachs and concepts. This article introduces principles of multi-scale choropleth maps. The principles are based on cartographic principles and the screen environment. The scale ranges are defined by readable smallest area units. There is a changeover to larger administrative units at a reduction of scale. Data classifications and color ramps (symbology) for different scale ranges satisfy traditional rules and be consistent throughout the ranges