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Retroazimuthal conformal map projection
The
Littrow projection
is a
map projection
developed by
Joseph Johann von Littrow
in 1833. It is the only
conformal
,
retroazimuthal
map projection. As a retroazimuthal projection, the Littrow shows directions, or azimuths, correctly from any point to the center of the map.
Patrick Weir of the
British Merchant Navy
independently reinvented the projection in 1890, after which it began to see more frequent use as recognition of its retroazimuthal property spread. Maps based on the Littrow projection are sometimes referred to as
Weir Azimuth diagrams
.
[1]
The projection transforms from latitude
φ
and longitude
λ
to map coordinates
x
and
y
via the following equations:
[2]
where
R
is the radius of the globe to be projected and
λ
0
is the longitude desired for the center point.
See also
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References
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External links
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