Filtering mechanisms for the visualization of non-geometrical and geometrical data

Abstract

The paper describes a fundamental feature in a prototype for the visualization of both geometrical and non-geometrical data: filtering mechanisms. The information class is a basic concept of this prototype. Each class combines a set of attributes associated to the same spatial reference with a list of graphical representations. Information filtering can be accomplished using the following mechanisms: limiting the variation domain of information class attributes, suppressing the visualization of one or more information classes, using the degree of interest function, selecting specific graphical representations accordingly both to the scale of representation and to the degree of interest function, displaying the data by levels of interest.