Relationship between map projections and distortions masks

List of map projections - Wikipedia

relationship between map projections and distortions masks

The basic problem of map projections is the representation of a curved surface in “stretching” or “shrinking” resulting in distortions or “tearing” resulting in projection and thus, potentially there exist an unlimited number of map projections. Position or alignment of the projection surface with relation to the datum surface. It is necessary for creating map, also all map projection distort the surface in Also a map projection is used to portray all or part of the round earth on a flat surface. .. although an unlimited number of arrangements of the earth's graticule are Enter the email address you signed up with and we'll email you a reset link. Distortion characteristics of a projection can be visualised by mapping . Expressing the relationship between the co-ordinates in the map plane and the .. Present-day map projection software, with its virtually unlimited possibilities for the.

No map has true direction everywhere. A few projections with different properties. The Lambert Conformal Conic preserves shape. The Mollweide preserves area. Compare the relative sizes of Greenland and South America in one and then the other.

relationship between map projections and distortions masks

The Orthographic projection preserves direction. The Azimuthal Equidistant preserves both distance and direction. The Winkel Tripel is a compromise projection.

More about scale Scale is the relationship between distance on a map or globe and distance on the earth. Suppose you have a globe that is 40 million times smaller than the earth. Its scale is 1: Any line you measure on this globe—no matter how long or in which direction—will be one forty -millionth as long as the corresponding line on the earth.

Advances in small-scale map projection research

In other words, the scale is true everywhere. This is because the globe and the earth have the same shape disregarding the complication of sphere versus spheroid. Now suppose you have a flat map that is 40 million times smaller than the earth. See the problem coming?

The type of projection and the properties preserved by the projection use the following categories: Type of projection[ edit ] Cylindrical In standard presentation, these map regularly-spaced meridians to equally spaced vertical lines, and parallels to horizontal lines. Pseudocylindrical In standard presentation, these map the central meridian and parallels as straight lines. Other meridians are curves or possibly straight from pole to equatorregularly spaced along parallels.

Map projection

Conic In standard presentation, conic or conical projections map meridians as straight lines, and parallels as arcs of circles. Pseudoconical In standard presentation, pseudoconical projections represent the central meridian as a straight line, other meridians as complex curves, and parallels as circular arcs.

Azimuthal In standard presentation, azimuthal projections map meridians as straight lines and parallels as complete, concentric circles. They are radially symmetrical.

relationship between map projections and distortions masks

In any presentation or aspectthey preserve directions from the center point. This means great circles through the central point are represented by straight lines on the map. Pseudoazimuthal In standard presentation, pseudoazimuthal projections map the equator and central meridian to perpendicular, intersecting straight lines.