Module:Location map/data/USA Alaska/doc

Template:Location map USA Alaska is a location map definition used to overlay markers and labels on an equirectangular projection map of the U.S. state of Alaska. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.

Usage

These definitions are used by the following templates when invoked with parameter "USA Alaska":

• {{Location map|USA Alaska |...}}
• {{Location map many|USA Alaska |...}}
• {{Location map+|USA Alaska |...}}
• {{Location map~|USA Alaska |...}}

Map definition

name

used in default map caption (Template:Location map/data/USA Alaska)

image

the default map image, without "Image:" or "File:" ([[:File:Template:Location map/data/USA Alaska|Template:Location map/data/USA Alaska]])

x

an expression to calculate a location on the map via its longitude; evaluates as 0 along the left edge and 100 along the right edge

y

an expression to calculate a location on the map via its latitude; evaluates as 0 along the top edge and 100 along the bottom edge

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	72	172	(,)	(0,0)
top/right	72	-129	(,)	(100,0)
bottom/left	51	172	(,)	(0,100)
bottom/right	51	-129	(,)	(100,100)
center	61.5	201.5	(,)	(50,50)

Examples

Location map: Eastern hemisphere, Deg/Min/Sec coordinates

Attu Island

Attu Island (Alaska)

{{Location map | USA Alaska
| width = 200
| float = right
| label = Attu Island
| position = right
| lat_deg =  52 | lat_min= 54 | lat_sec = 09 | lat_dir = N
| lon_deg = 172 | lon_min= 54 | lon_sec = 34 | lon_dir = E
}}

Location map: Eastern hemisphere, Decimal coordinates

Attu Island

Attu Island (Alaska)

{{Location map | USA Alaska
| width = 200
| float = right
| label = Attu Island
| position = right
| lat = 52.9025
| long = 172.909444
}}

Location map: Western hemisphere, Deg/Min/Sec coordinates

Ketchikan

class=notpageimage|

Location of Ketchikan in Alaska

{{Location map | USA Alaska
| width = 200
| float = right
| label = Ketchikan
| position = left
| caption = Location of [[Ketchikan]] in Alaska
| lat_deg =  55 | lat_min= 21 | lat_sec = 00 | lat_dir = N
| lon_deg = 131 | lon_min= 40 | lon_sec = 24 | lon_dir = W
}}

Location map: Western hemisphere, Decimal coordinates

Ketchikan

class=notpageimage|

Location of Ketchikan in Alaska

{{Location map | USA Alaska
| width = 200
| float = right
| label = Ketchikan
| position = left
| caption = Location of [[Ketchikan]] in Alaska
| lat = 55.35
| long = -131.673333
}}

Location map many: Deg/Min/Sec coordinates

Attu Island

Ketchikan

class=notpageimage|

Attu Island and Ketchikan in Alaska

{{Location map many | USA Alaska
| float = right | width = 200
| caption = [[Attu Island]] and [[Ketchikan]] in Alaska
| label = Attu Island | label_size = 90 | pos = right
| lat_deg =  52 | lat_min= 54 | lat_sec = 09 | lat_dir = N
| lon_deg = 172 | lon_min= 54 | lon_sec = 34 | lon_dir = E
| label2 = Ketchikan | label2_size = 90 | pos2 = left
| lat2_deg =  55 | lat2_min= 21 | lat2_sec = 00 | lat2_dir = N
| lon2_deg = 131 | lon2_min= 40 | lon2_sec = 24 | lon2_dir = W
}}

Location map many: Decimal coordinates

Attu Island

Ketchikan

class=notpageimage|

Attu Island and Ketchikan in Alaska

{{Location map many | USA Alaska
| float = right | width = 200
| caption = [[Attu Island]] and [[Ketchikan]] in Alaska
| label = Attu Island | label_size = 90 | pos = right
| lat = 52.9025
| long = 172.909444
| label2 = Ketchikan | label2_size = 90 | pos2 = left
| lat2 = 55.35
| long2 = -131.673333
}}

See also

• Template:Location map
• Template:Location map+
• Template:Location map many
• Template:Location map USA
• Template:Location map USA2