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Aquarius.NET®
- features
Cylindrical Projections
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Cylindrical Equal Area
Cylindrical Equal-Area projections have straight meridians and parallels, the
meridians are equally spaced, the parallels unequally spaced. There are normal,
transverse, and oblique cylindrical equal-area projections. Scale is true along
the central line (the equator for normal, the central meridian for transverse,
and a selected line for oblique) and along two lines equidistant from the
central line. Shape and scale distortions increase near points 90 degrees from
the central line.
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Mercator Projection
The Mercator projection has straight meridians and parallels that intersect at
right angles. Scale is true at the equator or at two standard parallels
equidistant from the equator. The projection is often used for marine
navigation because all straight lines on the map are lines of constant azimuth.
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Miller Cylindrical Projection
The Miller projection has straight meridians and parallels that meet at right
angles, but straight lines are not of constant azimuth. Shapes and areas are
distorted. Directions are true only along the equator. The projection avoids
the scale exaggerations of the Mercator map.
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Cylindrical Equidistant Projection
As was the case with azimuthal projections, the spacing between parallels can
be modified to produce an equidistant projection. On this projection, parallels
of latitude are equally spaced along meridians, the distance between parallels
being equal to the arc length between parallels on the generating globe.
Distances measured along the Equator (tangent case) or standard parallels
(secant case) and distances measured along any meridian are true to scale.
However, other distances are distorted. The cylindrical equidistant projection
is also called an equirectangular projection or plate carre.
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Transverse Cylindrical Equal Area Projection
Transverse of Lambert's Cylindrical Equal Area-for N/S expanse Used sparingly .
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Universal Transverse Mercator (UTM) projection
The Universal Transverse Mercator (UTM) projection is used to define
horizontal, positions world-wide by dividing the surface of the Earth into 6
degree zones, each mapped by the Transverse Mercator projection with a central
meridian in the center of the zone. UTM zone numbers designate 6 degree
longitudinal strips extending from 80 degrees South latitude to 84 degrees
North latitude. UTM zone characters designate 8 degree zones extending north
and south from the equator.
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Transverse Mercator Projection
Transverse Mercator projections result from projecting the sphere onto a
cylinder tangent to a central meridian. Transverse Mercator maps are often used
to portray areas with larger north-south than east-west extent. Distortion of
scale, distance, direction and area increase away from the central meridian.
Many national grid systems are based on the Transverse Mercator projection.
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Cassini Projection
This cylindrical projection was developed in 1745 by C. F. Cassini for the
survey of France. It is occasionally called Cassini-Soldner since the latter
provided the more accurate mathematical analysis that led to the development of
the ellipsoidal formulae. The projection is neither conformal nor equal-area,
and behaves as a compromise between the two end-members. The distortion is zero
along the central meridian. It is best suited for mapping regions of
north-south extent. The central meridian, each meridian 90 away, and equator
are straight lines; all other meridians and parallels are complex curves.
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