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Wikipedia:WikiProject Geographical coordinates/dim:

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The dim: parameter defines the diameter of a viewing circle centered on the coordinates. While the default unit of measurement is metres, the km suffix may be appended to indicate kilometres. The dim: parameter overrides the scale implied by any type: parameter.

Syntax — dim:<width><units>

width — integer number of metres (m) or kilometres (km)
units — m or km, if not specified, defaults to m

GeoHack uses dim: to select a map scale such that the viewing circle appears roughly 10 centimetres (4 in) in diameter on a 72 dpi computer monitor. If no dim:, type:, or scale: parameters are provided, GeoHack uses its default viewing circle of 30 kilometres (19 mi).

Samples
Subject Dim Markup Result
Buckingham Palace 120m {{coord|51.501|-0.142|dim:120m}} 51°30′04″N 0°08′31″W / 51.501°N 0.142°W / 51.501; -0.142
London 10km {{coord|51.507222|-0.1275|dim:10km}} 51°30′26″N 0°07′39″W / 51.507222°N 0.1275°W / 51.507222; -0.1275
Western Hemisphere 10,000 kilometres (6,200 mi) {{coord|0|N|90|W|dim:10000km}} 0°N 90°W / 0°N 90°W / 0; -90
Ohio 400 kilometres (250 mi) {{coord|40.5|-82.5|dim:400km}} 40°30′N 82°30′W / 40.5°N 82.5°W / 40.5; -82.5
Dresden 20,000 metres (12 mi) {{coord|51.03|13.73|dim:20000}} 51°02′N 13°44′E / 51.03°N 13.73°E / 51.03; 13.73
Statue of Liberty 100 metres (330 ft) {{coord|40.6892|-74.0445|dim:100}} 40°41′21″N 74°02′40″W / 40.6892°N 74.0445°W / 40.6892; -74.0445