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== Understanding map definition templates ==
{{expand section|date=August 2011}}

The {{tlf|Location map}} family of templates utilize any one of a set of map definitions. These are not forks but rather auxiliary pages and must have names following the pattern "Module:Location map/data/''location''" or "Template:Location map ''location''", where ''location'' is the name of the area covered by the map. The template space is supported only for backward compatibility; all new map definitions should be created as modules. '''Important:''' If a new map has the same projection and boundaries as the old map (such as [[:File:Iraq location map.svg]] and [[:File:Iraq location map2.svg]]), a new definition should '''not''' be created; instead, the old definition should be used with the AlternativeMap parameter. To create a simple map definition module using an image of a map with an [[equirectangular projection|equirectangular]] [[Mercator projection]]:

# Create a new map image and upload it to [[commons:Main Page|Wikimedia commons]] or find an existing map on the same site.
# Create a module named Module:Location map/data/''location'', copy the content below into it and substitute the appropriate values.
# Create a page named Module:Location map/data/''location''/doc and follow the instructions under [[#Documentation]].

As an example of a map that uses an equirectangular projection, we use [[Module:Location map/data/Belgium]]. Please do not experiment using active templates.

<syntaxhighlight lang="lua">return {
name = 'Belgium',
top = 51.8,
bottom = 49.2,
left = 2.2,
right = 6.9,
image = 'Belgium location map.svg',
image1 = 'Belgium relief location map.jpg'
}</syntaxhighlight>

{| class="wikitable" style="width: 50%;"
! Parameter
! Description
|-
| <code>name</code>
| The name of the area covered
|-
| <code>top</code>
| The latitude of the top edge of the image using [[decimal degrees]]
|-
| <code>bottom</code>
| The latitude of the bottom edge of the image
|-
| <code>left</code>
| longitude of the left edges of the image
|-
| <code>right</code>
| longitude of the right edges of the image
|-
| <code>image</code>
| The name of the image file on Commons
|-
| <code>image1</code>
| The name of an alternate image, usually a relief map, which can be accessed using the <code>relief</code> parameter.
|}

Maps of this type will work for small to mid sized areas. [[Module:Location map/data/USA Alabama]] is another example of a map description that uses an equirectangular projection. Notice that the image of the country is not what most would expect.

Maps that use other projections, such as [[Module:Location map/data/USA]], which uses an equidistant [[conic projection]]. require formulas which are used to calculate the <code>x</code> and <code>y</code> coordinates for the location mark. Understanding these formulas requires a familiarity with the subject and is currently beyond the scope of this discussion. Note that the formula for <code>x</code> evaluates to 0 for the left edge of the image and 100 for the right edge. Likewise, the formula for <code>y</code> evaluates to 0 for the top edge and 100 for the bottom edge.

=== Documentation ===

Here is an example of what a documentation page should look like:
{{#tag:pre|<nowiki>

{{Module:Location map/data/doc|image=[[File:Belgium-CIA WFB Map.png|thumb|250px|Map of Belgium]]
|examples=
=== Location map, using default map (image) ===
{{Location map | Belgium
| width = 200
| lat_deg = 50.85
| lon_deg = 4.35
| label = Brussels
}}
<pre style="width:30em">
{{Location map | Belgium
| width = 200
| lat_deg = 50.85
| lon_deg = 4.35
| label = Brussels
}}
</pre>
{{clear}}

=== Location map many, using relief map (image1) ===
{{Location map many | Belgium
| relief = yes
| width = 200
| caption = Two locations in Belgium
| lat1_deg = 50.85
| lon1_deg = 4.35
| label1 = Brussels
| lat2_deg = 51.22
| lon2_deg = 4.40
| label2 = Antwerp
}}
<pre style="width:30em">
{{Location map many | Belgium
| relief = yes
| width = 200
| caption = Two locations in Belgium
| lat1_deg = 50.85
| lon1_deg = 4.35
| label1 = Brussels
| lat2_deg = 51.22
| lon2_deg = 4.40
| label2 = Antwerp
}}
</pre>
{{clear}}

=== Location map+, using AlternativeMap ===
{{Location map+ | Belgium
| AlternativeMap = Belgium relief location map.jpg
| width = 200
| caption = Two locations in Belgium
| places =
{{Location map~ | Belgium
| lat_deg = 50.85
| lon_deg = 4.35
| label = Brussels
}}
{{Location map~ | Belgium
| lat_deg = 51.22
| lon_deg = 4.40
| label = Antwerp
}}
}}
<pre style="width:35em">
{{Location map+ | Belgium
| AlternativeMap = Belgium relief location map.jpg
| width = 200
| caption = Two locations in Belgium
| places =
{{Location map~ | Belgium
| lat_deg = 50.85
| lon_deg = 4.35
| label = Brussels
}}
{{Location map~ | Belgium
| lat_deg = 51.22
| lon_deg = 4.40
| label = Antwerp
}}
}}
</pre>
}}
<includeonly>


[[Category:Belgium location map templates|Belgium location map templates]]

</includeonly>
</nowiki>}}

The following parameters are taken by [[Module:Location map/data/doc]]:
{| class="wikitable" style="width: 50%;"
! Parameter
! Description
|-
| <code>image</code>
| An additional image to display (other than the one the location map uses) on the right side of the documentation page. If not specified, no additional image is displayed.
|-
| <code>projection</code>
| The type of projection the location map uses. If not specified, "<nowiki>an [[equirectangular projection]]</nowiki>" is used.
|-
| <code>name</code>
| The name to display in the map's documentation. If not specified, the actual name of the location map is used.
|-
| <code>examples</code>
| A section containing examples of the location map's usage. A {{tl|clear}} template is automatically placed at the end of the examples. If not specified, no examples are output.
|-
| <code>see also</code>
| Additional links to place in the "See also" section.
|}
All information about the map will be automatically taken from the map's definition itself.

Template:Location map/Creating a new map definition - Revision history

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