ଛାଞ୍ଚ:Location map Alaska

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Location map of Alaska
name Alaska
border
coordinates
72
172 ←↕→ -129
51
map center 61°30′N 158°30′W / 61.5°N 158.5°W / 61.5; -158.5
x (100*(({{{3}}} + ({{{3}}} < 0)*360) - 172)/((-129 + 360) - 172))
y (100*({{{2}}} - 72)/(51 - 72))
image USA Alaska location map.svg
Location map Alaska
image1 800x598 Carte Alaska R3.jpg
Location map Alaska
Template documentation[view] [edit] [history] [purge]
Map of Alaska (click on map to see larger image)

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[ସମ୍ପାଦନା]

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

Map definition[ସମ୍ପାଦନା]

  • name = Alaska
    Name used in the default map caption
  • bottom = 51
    Latitude at bottom edge of map, in decimal degrees
  • left = 172
    Longitude at left edge of map, in decimal degrees
  • right = -129
    Longitude at right edge of map, in decimal degrees
  • x = (100*(({{{3}}} + ({{{3}}} < 0)*360) - 172)/((-129 + 360) - 172))
    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 = (100*({{{2}}} - 72)/(51 - 72))
    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[ସମ୍ପାଦନା]

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

Alternative map

The map defined as image1 (800x598 Carte Alaska R3.jpg) can be displayed by using the relief or AlternativeMap parameters in {{Location map}}, {{Location map many}} and {{Location map+}}. The use of these two parameters is shown in the examples below. Additional examples can be found at:

Examples using location map templates[ସମ୍ପାଦନା]

Location map: Eastern hemisphere, Deg/Min/Sec coordinates[ସମ୍ପାଦନା]

Attu Island is located in Alaska
Attu Island
Attu Island
Attu Island (Alaska)
{{Location map | USA Alaska
| width = 250
| 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[ସମ୍ପାଦନା]

Attu Island is located in Alaska
Attu Island
Attu Island
Attu Island (Alaska)
{{Location map | USA Alaska
| width = 250
| float = right
| label = Attu Island
| position = right
| lat = 52.9025
| long = 172.909444
}}

Location map: Western hemisphere, Deg/Min/Sec coordinates, Relief map[ସମ୍ପାଦନା]

Ketchikan is located in Alaska
Ketchikan
Ketchikan
Location of Ketchikan in Alaska
{{Location map | USA Alaska
| relief = yes
| width = 250
| 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, AlternativeMap[ସମ୍ପାଦନା]

Ketchikan is located in Alaska
Ketchikan
Ketchikan
Location of Ketchikan in Alaska
{{Location map | USA Alaska
| AlternativeMap = 800x598 Carte Alaska R3.jpg
| width = 250
| float = right
| label = Ketchikan
| position = left
| caption = Location of [[Ketchikan]] in Alaska
| lat = 55.35
| long = -131.673333
}}

Location map many: Deg/Min/Sec[ସମ୍ପାଦନା]

Location map Alaska is located in Alaska
Attu Island
Ketchikan
Attu Island and Ketchikan in Alaska
{{Location map many | USA Alaska
| float = right | width = 300
| 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[ସମ୍ପାଦନା]

Location map Alaska is located in Alaska
Attu Island
Ketchikan
Attu Island and Ketchikan in Alaska
{{Location map many | USA Alaska
| float = right | width = 300
| 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[ସମ୍ପାଦନା]

Location map templates
Infobox templates incorporating (passing values to) the Location map template
List