Graphics Generators


Production graphics environments (e.g., Photoshop, Freehand) offer the most comprehensive set of tools to make attractive graphics, but are limited to two dimensions. More important, their content is not directly addressable (i.e., the image produced does not consist of individual features that can be selected and manipulated at will).

Animation environments (e.g., Director, Flash) are becoming popular as a means to bring interactive, animated graphics into a web environment (usually via the web plug-in). Analytically, they are limited and they are time-consuming to use. Nonetheless, they can produce effective, specialized teaching and learning aids that deal directly with time, thus allowing descriptions of processes to be animated, and they allow unimportant interface details to be hidden from the end user. Examples of Flash applications for K–12 education are available on the web from http://www.geovista.psu.edu/grants/MapStatsKids/pubs.html.


Visual Exploration Systems


Information visualization systems (e.g., Data Explorer [DX], Advanced Visualization System [AVS]) can sustain the greatest variety of data types. They provide support for the third dimension and often for time as well. They permit a high degree of flexibility in the way that data are displayed. However, they offer limited analysis capability. In information visualization systems, spatial variables have no special status and no predefined assignment because any data value can be assigned to any visual variable. Thus, whereas in a GIS only data that are specifically spatial can be used as the location of an object, information visualization systems enable users to assign any data to be represented by, say, location or height.

Concept mapping tools (e.g., TouchGraph, ThemeRiver) spatialize data that are not inherently spatial, relying typically on an algorithm to order the position and displacements between components of the display (Figures 2.4 and 2.5). Like information visualization methods, concept graphing tools are usually geared toward visual exploration rather than analysis. They do not address any of the explicitly geographical aspects of spatial information.

four groups. Table 7.1 compares these eight high-tech tools in relation to their ability to spatialize, visualize, and perform functions (see Chapter 6.7).

Currently, none of the high-tech tools listed in Box 7.1 and Table 7.1 meet all of the necessary requirements to support spatial thinking. Instead, each system meets some of the requirements. For example, information visualization systems offer great flexibility in the way data are displayed, but provide limited analytical capability. Concept graphing tools support the spatialization and visual exploration of data, but do not reference objects in geographic space. Although animation environments deal well with time, they are cartographically and analytically weak. GIS support a wide variety of data types, integrate and geo-register data, provide high-quality cartographic output, and support spatial analysis. However, they offer poor support for time, the vertical dimension, and multimedia. At best, GIS provide limited support for spatializing nonspatial data. However, when set in the context of alternative hi-tech systems, GIS fares as well as, if not better than, other high-tech systems (see Table 7.1) as a tool for the support of spatial thinking.

All of the high-tech systems in Table 7.1 are becoming more powerful by (1) adding analytical capabilities; (2) providing flexible and visually appealing graphic and cartographic presentations; (3) supporting multimedia and multiformat data; (4) supporting tools such as APIs that can generate specialized but easy-to-use applications; (5) providing easier-to-use functionality, supported by context-sensitive help and software wizards; and (6) offering better integration with other information system products via emerging middleware standards, possibly leading to the embedding of



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