Cartographic Objects in a Multiscale Data Structure

Abstract

Displays should be more adaptable to users’ needs and their tasks instead of creating and presenting a static view of the data. In current approaches, objects to render are selected for each map and then transformed into cartographic objects to construct a map. This chapter considers the operation zooming as a new perspective on the problem of multiscale representations. The multiscale structure also supports multilevel modelling and combinations of objects in different scales in one map. Most geographic objects do not have directly visible and sharp boundaries (geological layers, soils); others do not have visible boundaries but boundary zones or undetermined boundaries (for example, forest, sand dunes). The problem to address is the selection of the objects in the forest which must be rendered. Two aspects can be separated, namely, the selection of objects which geometrically extend into a window and the selection of objects to achieve constant information density.

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