Module:Location map/data/Tuvalu/doc
This is the documentation page for Module:Location map/data/Tuvalu
| This is a documentation subpage for Module:Location map/data/Tuvalu. It contains usage information, categories and other content that is not part of the original module page. |
Template:Location map Tuvalu is a location map definition used to overlay markers and labels on an equirectangular projection map of Tuvalu. It is used by "Template:Location map" when invoked with parameter "Tuvalu": {{Location map | Tuvalu | ...}}. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
[[Image:Template:Location map/data/Tuvalu|left|thumb|200px|Location map for Template:Location map/data/Tuvalu]]
| Map parameters | ||
|---|---|---|
| name | Template:Location map/data/Tuvalu | name used in default map caption |
| image | Template:Location map/data/Tuvalu | file name of map image, without "Image:" or "File:" |
| x | Template:Location map/data/Tuvalu | an expression which evaluates as 0 along the left edge of the map, and 100 along the right edge of the map, where {{{2}}} and {{{3}}} are the degrees latitude and longitude respectively. |
| y | Template:Location map/data/Tuvalu | an expression which evaluates as 0 along the top edge of the map, and 100 along the bottom edge of the map, where {{{2}}} and {{{3}}} are the degrees latitude and longitude respectively. |
Contents
Usage
For a description of the parameters, see {{Location map}} and {{Location map many}}.
Location map: Eastern hemisphere, Deg/Min/Sec coordinates
{{Location map | Tuvalu
| width = 150 | float = right
| caption = Location of [[Nanumea]] in Tuvalu
| label = Nanumea
| background = lightblue
| position = right
| lat_deg= 05 | lat_min=41 | lat_sec= | lat_dir=S
| lon_deg=176 | lon_min=12 | lon_sec= | lon_dir=E
}}
Location map: Eastern hemisphere, Decimal coordinates
{{Location map | Tuvalu
| width = 150 | float = right
| caption = Location of [[Nanumea]] in Tuvalu
| label = Nanumea
| background = lightblue
| position = right
| lat = -5.683
| long = 176.2
}}
Location map: Western hemisphere, Deg/Min/Sec coordinates
{{Location map | Tuvalu
| width = 150 | float = right
| caption = Coordinates on Tuvalu map
| label = 10°15′S 179°59′W
| background = lightgreen
| position = left
| lat_deg= 10 | lat_min=15 | lat_sec= | lat_dir=S
| lon_deg=179 | lon_min=59 | lon_sec= | lon_dir=W
}}
Location map: Western hemisphere, Decimal coordinates
{{Location map | Tuvalu
| width = 150 | float = right
| caption = Coordinates on Tuvalu map
| label = -10.25, -179.983333
| background = lightgreen
| position = left
| lat = -10.25
| long = -179.983333
}}
Technical details
For a map using an equirectangular projection which does not cross +/-180 longitude, or +/-90 latitude, the following expressions can be used:
x = 100*(long - left)/(right - left)
y = 100*(lat - top)/(bottom - top)
where lat and long are the degrees latitude and longitude respectively. Here, top and bottom are the degrees latitude of the top and bottom edges of the map, left and right are the degrees latitude of the left and right edges of the map.
Things are a bit more complicated when the map crosses +/-180 longitude, and some sort of "modulo arithmetic" is required. Here, we add 360 if the longitude is less than 0, then use a mapping based on positive coordinates. The following table can be used to check if the expressions are working as desired:
| location | lat | long | (x,y) test | (x,y) exact |
|---|---|---|---|---|
| top/left | -5.3 | 175.7 | (Expression error: Unrecognized punctuation character "[".,Expression error: Unrecognized punctuation character "[".) | (0,0) |
| top/right | -5.3 | -179.8 | (Expression error: Unrecognized punctuation character "[".,Expression error: Unrecognized punctuation character "[".) | (100,0) |
| bottom/left | -11.0 | 175.7 | (Expression error: Unrecognized punctuation character "[".,Expression error: Unrecognized punctuation character "[".) | (0,100) |
| bottom/right | -11.0 | -179.8 | (Expression error: Unrecognized punctuation character "[".,Expression error: Unrecognized punctuation character "[".) | (100,100) |
| center | -8.15 | 177.95 | (Expression error: Unrecognized punctuation character "[".,Expression error: Unrecognized punctuation character "[".) | (50,50) |