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The <code>dim:</code> parameter defines the [[diameter]] of a viewing circle centered on the coordinate. While the default unit of measurement is metres, the <code>km<code> suffix may be appended to indicate kilometres.
[[tswiki:GeoHack|GeoHack]] uses <code>dim:</code> to select a [[Scale (map)|map scale]] such that the viewing circle appears roughly {{convert|10|cm|in|0}} in diameter on a 72 [[Dots per inch|dpi]] computer monitor. If no <code>dim:</code>, <code>type:</code>, or <code>scale:</code> parameters are provided, GeoHack uses its default viewing circle of {{convert|30|km|mi}}.
{| class="wikitable"
|+ Samples
! Subject
! View diameter
! Markup
! Result
|-
| [[Western Hemisphere]]
|align=right| {{convert|10000|km|mi}}
| <nowiki>{{coord|0|N|90|W|dim:10000km}}</nowiki>
| {{coord|0|N|90|W|dim:10000km}}
|-
| [[Ohio]]
|align=right| {{convert|400|km|mi}}
| <nowiki>{{coord|40.5|-82.5|dim:400km}}</nowiki>
| {{coord|40.5|-82.5|dim:400km}}
|-
| [[Dresden]]
|align=right| {{convert|20000|m|mi}}
| <nowiki>{{coord|51.033|13.73|dim:20000}}</nowiki>
| {{coord|51.033|13.73|dim:20000}}
|-
| [[Statue of Liberty]]
|align=right| {{convert|100|m|ft}}
| <nowiki>{{coord|40.6892|-74.0445|dim:100}}</nowiki>
| {{coord|40.6892|-74.0445|dim:100}}
|-
|}
[[tswiki:GeoHack|GeoHack]] uses <code>dim:</code> to select a [[Scale (map)|map scale]] such that the viewing circle appears roughly {{convert|10|cm|in|0}} in diameter on a 72 [[Dots per inch|dpi]] computer monitor. If no <code>dim:</code>, <code>type:</code>, or <code>scale:</code> parameters are provided, GeoHack uses its default viewing circle of {{convert|30|km|mi}}.
{| class="wikitable"
|+ Samples
! Subject
! View diameter
! Markup
! Result
|-
| [[Western Hemisphere]]
|align=right| {{convert|10000|km|mi}}
| <nowiki>{{coord|0|N|90|W|dim:10000km}}</nowiki>
| {{coord|0|N|90|W|dim:10000km}}
|-
| [[Ohio]]
|align=right| {{convert|400|km|mi}}
| <nowiki>{{coord|40.5|-82.5|dim:400km}}</nowiki>
| {{coord|40.5|-82.5|dim:400km}}
|-
| [[Dresden]]
|align=right| {{convert|20000|m|mi}}
| <nowiki>{{coord|51.033|13.73|dim:20000}}</nowiki>
| {{coord|51.033|13.73|dim:20000}}
|-
| [[Statue of Liberty]]
|align=right| {{convert|100|m|ft}}
| <nowiki>{{coord|40.6892|-74.0445|dim:100}}</nowiki>
| {{coord|40.6892|-74.0445|dim:100}}
|-
|}
