How is the area kept equal in cylindrical equal area projection?
The amount of stretch is the same at any chosen latitude on all cylindrical projections, and is given by the secant of the latitude as a multiple of the equator’s scale. This divides north-south distances by a factor equal to the secant of the latitude, preserving area but heavily distorting shapes.
What is an example of equal area projection?
In an equal-area projection, Tissot circles are all the same relative size across the map. Despite how the Tissot indicatrix changes from a circle to an ellipse, an equal-area projection retains relative size.
What are equal area projections also called?
Equal-area projections are also called equivalent, homolographic, homalographic, authalic, or equiareal (Lee 1944; Snyder 1987, p. 4).
What is an equal-area map used for?
In map projection, equal-area maps preserve area measure, generally distorting shapes in order to do that. Equal-area maps are also called equivalent or authalic.
What do you mean by cylindrical equal area projection?
Cylindrical equal area is a cylindric projection. The meridians are vertical lines, parallel to each other, and equally spaced. In this projection, the poles are represented as straight lines across the top and bottom of the grid, the same length as the equator.
What is a equal area region?
An equal area projection is a map projection that shows regions that are the same size on the Earth the same size on the map but may distort the shape, angle, and/or scale.
What is a equal-area region?
What are the advantages of cylindrical projection?
A cylindrical projection is accurate near the equator but distorts distances and sizes near the poles. One advantage to cylindrical projections is that parallels and meridians form a grid, which makes locating positions easier. On a cylindrical projection, shapes of small areas are usually well preserved.
What is an equivalent map projection?
Projections which preserve areas are called equivalent or equal-area projections. A map projection either preserves areas everywhere, or distorts it everywhere. This is an all-or-nothing property.