Is this equidistant conic projection a tangent or secant projection?

Is this Equidistant Conic projection a tangent or secant projection? How can you tell? The projection is a secant conic projection. You can tell because it has two standard parallels.

What is the difference between a secant and a tangent projection?

Some map projections contact the earth’s surface along a point or line, called a tangent, while other map projections contact the earth’s surface along two lines, called secants. Features at these locations on the projection are represented as they really are on the earth’s surface.

Why is a conic secant projection generally more accurate than a conic tangent projection?

These projections are called Secant projections and are defined by two standard parallels. Generally, a Secant projection has less overall distortion than a Tangent projection. On still more complex Conic projections, the axis of the cone does not line up with the polar axis of the globe.

What are the disadvantages of conic projection?

Like all projections, the Albers Equal Area Conic Projection has map distortion. Distances and scale are true only on both standard parallels with directions being reasonably accurate.

What are the three types of projections?

This group of map projections can be classified into three types: Gnomonic projection, Stereographic projection and Orthographic projection.

What are conic projections most accurate at?

Even then, the scale of the map rapidly becomes distorted as distance from the correctly represented standard parallel increases. Because of this problem, conic projections are best suited for maps of mid-latitude regions, especially those elongated in an east- west direction.

What is the disadvantage of the Robinson projection?

Advantage: The Robinson map projection shows most distances, sizes and shapes accurately. Disadvantage: The Robinson map does have some distortion around the poles and edges.

Are there distortions in a tangent and secant projection?

Tangents and secants. That is, there is no distortion of shape, area, distance, direction, or scale. Features at these locations on the projection are represented as they really are on the earth’s surface. These examples show tangent and secant conic map projections. As you move farther away from the tangent or secant lines, distortion increases.

What is the difference between a tangent and a secant?

Some map projections contact the earth’s surface along a point or line, called a tangent, while other map projections contact the earth’s surface along two lines, called secants. Both tangents and secants represent locations on the map projection where there is no distortion.

When do you use the equidistant conic projection?

If two standard parallels are placed symmetrically north and south of the equator, the resulting projection is the same as the Equirectangular projection. In this case, you must use the Equirectangular projection. Use the Equirectangular projection if the standard parallel is the equator.

When to use an equirectangular or tangential projection?

Use the Equirectangular projection if the standard parallel is the equator. Depends on the number of standard parallels. Tangential projections (Type 1)—one line, indicated by the standard parallel.