Isotype vs Schematic Transit Diagram
アイソタイプ / スキーマティック路線図
Both sit in Information Design, so the question is not what they belong to but how they behave. Both are read here as layout. They are reached for with some of the same intent, which is where they get confused.
Isotype
Translates quantity into repeated same-size symbols, making comparison readable before language.
Schematic Transit Diagram
Discards geographic accuracy for horizontal, vertical and 45-degree lines with evenly spaced stations. Beck's 1933 London Underground diagram established it as the common language of transit maps worldwide.
| Isotype | Schematic Transit Diagram | |
|---|---|---|
| Era | 1920s–1940s | 1933– |
| Family | Information Design | Information Design |
| Kind | Layout | Layout |
| Cues | Unified pictograms / Repetition of signs / Axes of comparison / Restricted color | Lines limited to 45 degrees / Evenly spaced stations / Color-coded lines / Independence from geography |
| Best used for | Statistics comparable without expertise · Basic guidance and education across languages | Reducing a complex network to what riders need, stations and interchanges · Showing a process or line where order matters more than geography |
| Type | Short labels and clear figures; prose stays outside the chart | Set station names at one constant angle in a single face and size |
| Composition | Fix the unit per symbol; show change by count, never by size | Only horizontal, vertical and 45 degrees, even spacing, widened where stations crowd |
| Material | Few meaningful colors, equal line weights, aligned baselines | One color per line, white circles for interchanges, plain background behind |
| Caution | Never scale one big symbol to show a difference. Always show unit, base and source. | Trying to keep a little geographic accuracy breaks the angle rule, and the diagram ends up neither accurate nor easy to read. |