What is a sinusoidal projection map?

The sinusoidal projection is a pseudocylindrical equal-area projection displaying all parallels and the central meridian at true scale. The boundary meridians bulge outward excessively producing considerable shape distortion near the map outline. The sinusoidal map projection is shown centered on Greenwich.

What is the purpose of a sinusoidal projection?

Sinusoidal projection maps present accurate area and distance at every parallel and at the central meridian; distortion increases at the outer meridians and at high latitudes. It is often used in atlases to map Africa and South America.

What does sinusoidal mean in geography?

equal-area map
n. (Physical Geography) an equal-area map projection on which all parallels are straight lines and all except the prime meridian are sine curves, often used to show tropical latitudes.

What is a Homolosine projection map?

homolosine projection. / (hɒˈmɒləˌsaɪn) / noun. a map projection of the world on which the oceans are distorted to allow for greater accuracy in representing the continents, combining the sinusoidal and equal-area projections.

What do you mean by sinusoidal?

: of, relating to, shaped like, or varying according to a sine curve or sine wave sinusoidal motion sinusoidal alternating current sinusoidal grooves.

Who uses equal area projection?

The USGS commonly uses the Albers Equal Area Conic projection because of how it proportionally represents areas for the conterminous United States. Like all map projections, the Albers Equal Area Conic Projection distorts other properties in a map.

What’s wrong with the Robinson projection?

Distortion. The Robinson projection is neither conformal nor equal-area. It generally distorts shapes, areas, distances, directions, and angles. The distortion patterns are similar to common compromise pseudocylindrical projections.

What is wrong with the Goode projection?

Distortion. Goode homolosine is an equal-area (equivalent) projection. Shapes, directions, angles, and distances are generally distorted.

What makes something sinusoidal?

A sinusoidal function is one with a smooth, repetitive oscillation. “Sinusoidal” comes from “sine”, because the sine function is a smooth, repetitive oscillation. Examples of everyday things which can be represented by sinusoidal functions are a swinging pendulum, a bouncing spring, or a vibrating guitar string.

What is the equal area projection best used for?

The equal-area projection retains the relative size of the area throughout a map. So that means at any given region in a map, an equal-area projection keeps the true size of features. While equal-area projections preserve area, it distorts shape, angles and cannot be conformal.

Which projection should I use?

Use equal area projections for thematic or distribution maps. Presentation maps are usually conformal projections, although compromise and equal area projections can also be used. Navigational maps are usually Mercator, true direction, and/or equidistant.

Which is the best definition of sinusoidal projection?

Definition of sinusoidal projection : an equal-area map projection capable of showing the entire surface of the earth with all parallels as straight lines evenly spaced, the central meridian as one half the length of the equator, and all other meridians as curved lines First Known Use of sinusoidal projection 1944, in the meaning defined above

When was the sinusoidal projection first used in China?

The Sinusoidal projection was certainly used in the original Kangxi maps (Wang 1991) as well as d’Anville’s province maps of China.

Which is the best definition of a sine curve projection?

(Physical Geography) an equal-area map projection on which all parallels are straight lines and all except the prime meridian are sine curves, often used to show tropical latitudes. Also called: Sanson-Flamsteed projection

How does a sinusoidal projection of the North Pole work?

A sinusoidal projection shows relative sizes accurately, but distorts shapes and directions. Distortion can be reduced by “interrupting” the map. Similar projections which wrap the east and west parts of the sinusoidal projection around the north pole are the Werner and the intermediate Bonne and Bottomley projections.