Classed versus Unclassed Choropleth Maps
A Question of How Many Classes
Bibliographic Data
| ID | 14701038 |
|---|---|
| Authors | Robert G Cromley (University of Connecticut, corresponding author) |
| Year | 1995 |
| Volume | 32 |
| Issue | 4 |
| Pages | 15-27 |
| Publication date | 1995-12-01 |
| Open Access | No |
| Type | ARTICLE |
| Venue | Cartographica The International Journal for Geographic Information and Geovisualization (JOURNAL) |
| Journal identifiers | ISSN: 0317-7173 • E-ISSN: 1911-9925 |
| Publisher | University of Toronto Press Inc. (UTPress) (PUBLISHER) |
| DOI | 10.3138/j610-13nu-5537-0483 |
| OpenAlex | W2034019299 |
| Language | EN |
| Citations received | 4 |
The question of classed versus unclassed maps can be rephrased as a question of how many classes to use. An unclassed map has as many classes as there exist unique data values in the distribution. However, not all of these classes may be necessary if the map reader cannot discriminate among the graphic values representing unique numerical values. This paper presents an optimal classification scheme that minimizes the number of classes for a given level of value discrimination. Results show that far fewer classes than those found in an unclassed map are necessary to portray the underlying spatial structure of the data distribution. Cartes statistiques classifiées et non classifiées : combien de classes? La question qui surgit propos des cartes classifies, par opposition aux cartes non classifies, peut tre revue comme un questionnement sur le nombre de classes utiliser. Une carte non classifie a autant de classes qu'il existe de valeurs de donnes uniques dans la distribution. Par contre, toutes ces classes peuvent ne pas tre ncessaires si le lecteur de la carte ne peut pas diffrencier les valeurs graphiques reprsentant chaque valeur numrique unique. Cet article prsente un plan de classification optimal qui minimise le nombre de classes pour un niveau donn de diffrenciation de valeurs. Les rsultats montrent que, pour reprsenter la structure spatiale sous-jacente de la distribution de donnes, il faut beaucoup moins de classes que ce que l'on trouve dans une carte non classifie
Art · Cartography · Geography · Humanities · Mathematics · Spatial and Panel Data Analysis
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| Citations per year | 0.17 |
|---|---|
| Citation span | 2002 - 2016 (15) |
| Highly cited | No |