Design Strategies for Continuous-tone Area Mapping

Brassel, Kurt E.; Utano, Jack J.

doi:10.1559/152304079784022718

Cited by 13 publications

(4 citation statements)

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“…In a fashion sirni I a r to the work st at i o n-b ased "density d i al " of Ferreira and Wiggins (1990), imagine moving the mouse cursor along the number line and seeing the map change dynamically in real time. With a suitable number of available colors, this approach can be extended so that the portion of the data range being highlighted is symbolized as a separate unclassed data set, an approach identical to Brassel and Utano's (1979) quasi-continuous method.…”

Section: Displayable Colors and Beyondmentioning

confidence: 99%

EXPLOREMAP: An Exploration System for Choropleth Maps

Egbert

Slocum

1992

Annals of the Association of American Geographers

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Software for interactive choropleth mapping typically focuses on design, with the assumption that the resulting map will be used like a traditional paper one. We believe that interactive graphics also should enable users to explore the database underlying a map. In this vein, we have developed software that will permit users to both design a map and explore the underlying database.The exploration component, the raison d'Ctre for the software, includes the following options: Overview, Areas, Reclass, Regions, Tables, and Graphs & Stats. Within Overview, users can display map elements in sequence, any combination of classes, and highlighted subsets of the data. Within Areas, users can determine values associated with areas, compare values for two areas, and determine minimum and maximum values for classes and the entire map. Reclass allows users to reclassify the map data temporarily, thus determining the effect of different classification schemes. The Regions option permits regions to comprise specified areas, while Tables and Graphs & Stats present tabular, graphical, and statistical displays of the data in pop-up windows.The user interface consists of pull-down menus and mouse input, and the software i s compatible with standard IBM VCA graphics hardware. Some potential future enhancements include the display of 256 colors at one time, which will speed display and permit animation; other symbol approaches such as three-D; and links with CIS.People who make maps tend to have a uni-map mentality; they search for the best single symbolization to use on a map. In actuality, a geographical topic may be better illuminated by multi-map display, using more than one form of symbolization for a single data set.More recently, MacEachren and Ganter (1990, 75) expanded o n this theme:Rather than developing expert systems that help find a single optimal map for representing a set of information, we need to develop systems that encourage exploration of multiple perspectives on the same data.In much the same way that Tukey (1977) advocated exploratory methods for aspatial data, cartographers need to develop exploratory methods for spatial data (DiBiase 1990, 14). In this vein, we have developed interactive soft-

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Section: Displayable Colors and Beyondmentioning

confidence: 99%

EXPLOREMAP: An Exploration System for Choropleth Maps

Egbert

Slocum

1992

Annals of the Association of American Geographers

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“…Tobler (1973) points out that grouping gray levels into classes is not used to enhance aerial photographs or television; indeed, a large number (26) Of course, this introduces subjective bias, and outliers should therefore be defined and deleted in a systematic manner. Brassel and Utano (1979) have suggested a "quasi-continuous" shading scheme wherein the user has the option of delimiting the range of data within which the continuous symbolization is to be applied.…”

Section: The Debate: Whither Class Intervals?mentioning

confidence: 99%

A Case for Better Graphics: The Unclassed Choropleth Map

Gale¹,

Halperin²

1982

The American Statistician

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“…Proportional symbolisation in maps has its strong proponents both in academic and professional circles in thematic cartography. Notable among them are Tobler (1973) [1], Brassel and Utano (1979) [2], Muller (1979) [3] Paterson, (1979) [4]. They take a view that is contrary to the advocates of graded symbolisation and reject the comparison of differences based on the psychological theory of absolute threshold levels on grounds of inappropriateness.…”

Section: Introductionmentioning

confidence: 99%

The Role of Symbol Form and Legend Design in Proportional Point Symbolised Maps: An Experimental Study in Thematic Map Design

John¹

2014

IOSRJHSS

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Point symbols are the most commonly used proportional symbols in thematic mapping. Traditionally two types of symbols have been in use in this category -proportional squares and circles. These studies have reported malfunctioning of these symbol forms in terms of the errors reflected in response outputs of the magnitudes both in absolute and relative modes when these are read from the symbols placed in map environments. This malfunctioning of the symbol among other factors was ascribed to the type and design of symbol form and the legend provided on these maps. This paper examines the deficiencies in symbol form design of proportional circles and squares together with the existing design practices of legend design. An effort will also be made to improve symbol form by (1) adding (a) uniform gray area fills (b) graded gray area fills in the open circle and square form together with (2) an improvement in legend deign and its organisation. These design improvements will be tested experimentally by measuring the resulting improvements in terms of both efficiency and effectiveness of visual information processing. The experimental results have shown enhancements in both efficiency and effectiveness in information processing from maps due to proposed design improvement.

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Design Strategies for Continuous-tone Area Mapping

Cited by 13 publications

References 0 publications

EXPLOREMAP: An Exploration System for Choropleth Maps

EXPLOREMAP: An Exploration System for Choropleth Maps

A Case for Better Graphics: The Unclassed Choropleth Map

The Role of Symbol Form and Legend Design in Proportional Point Symbolised Maps: An Experimental Study in Thematic Map Design

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