- Tytuł:
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Konstrukcja skal wartości w legendach map
Composition of value scales in map legends - Autorzy:
- Czerny, A.
- Powiązania:
- https://bibliotekanauki.pl/articles/204443.pdf
- Data publikacji:
- 2003
- Wydawca:
- Polskie Towarzystwo Geograficzne
- Tematy:
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kartografia
mapa
legenda mapy
cartography
map
map legend - Opis:
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Autor analizuje graficzne skale wartości stosowane w legendach map: kartogramów, kartodiagramów i map izoliniowych; stara się wyjaśnić różne sposoby konstrukcji legend ilościowych przedstawień kartograficznych i ocenić ich poprawność.
Twenty years ago Polish Cartographic Review published articles on the composition of legends on choropleth and isopleth maps as well as graduated symbol maps (J. Pasławski 1982, I. Frączek 1983). They proposed a set of optimal legends, the number of which can limit the freedom of designing maps, e.g. it does not recommend horizontal arrangement of color scales in the legends of choropleth and isopleth maps. At the same time, contrary methods are widely applied in maps, atlases and cartography handbooks. The article analyzes elements of the composition of legends of quantitive cartographic presentations: - continuity of the graphic value scale (bar scale or segments) - orientation (positively and negatively oriented scales) - value description (limit values or classes) Some of the solutions applied in maps can not be justified. Fragmentation of color thematic scales, for example, is a mistake (fig. 1). Negatively oriented scales are also wrong (the positive part of scale at the botton or on the right, as in fig. 10B); various orientations should not appear in the same atlas or even legend (fig. 13). Some methods of scale composition can be accepted as exceptions, e.g. positive vertical scale following the direction of reading of a text column (fig. 8); model diagrams arranged decreasingly because of the composition of the map (fig. 12). According to the author these also exist correct graphic solutions, used from the point of view of map composition, although have not been recommended in the above articles. They include: 1. Horizontal, positively oriented color scale (with the maximum value on the right). It agrees with our reading scheme and the orientation of the X axis on the surface (fig. 8,9). 2. Legend of a continuous graduated symbol map in form of overlapping diagrams. Continuous graduated symbol maps belong to the type of so called "seeing maps" (carte a voir), with present the distribution of phenome na on general level; particular values can be read, but their role is secondary. Therefore a cartographer should be free to decide, if there is a need for a legend in a form of a graph, which makes it possible to read particular values (fig. 17), or if a minimal legend composed of overlapping diagrams would be sufficient (fog. 15A). 3. Scale of a choropleth map in a form of a bar diagram. A legend of a choropleth map can have a form of a code chart or a diagram. A code chart is composed of a series of color segments with numeral or verbal information assigned to them (in the case of nominal value scales). A bar diagram in the form of a rectangle symbolizes a set of data (values of a phenomenon) and its subdivision into classes; it can be applied in legends of both isarythmic and choropleth maps. In the case of a choropleth map class ranges should be described; in the case of an isarythmic map - class limits. Fig. 20 presents various graphic color scales of a choropleth map in a form of a bar diagram. J. Pasławski recommends scale E; it is a construction intermediate between a code chart and a diagram (segments show class ranges). - Źródło:
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Polski Przegląd Kartograficzny; 2003, T. 35, nr 2, 2; 87-99
0324-8321 - Pojawia się w:
- Polski Przegląd Kartograficzny
- Dostawca treści:
- Biblioteka Nauki
Artykuł