Tearing
occurs along the edges of a Robinson map
. Compression: Robinson projections are not equivalent; they do suffer from compression. However, the amount of area distortion is generally low within about 45° of the equator.
Does the Robinson map have 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. Area distortion grows with latitude and does not change with longitude.
Where is a Robinson map accurate and distorted?
Robinson (1963)
Directions true
along all parallels and along central meridian
. Distances constant along the equator and other parallels, but scales vary. All points have some distortion but it is very low along the equator and within 45° of centre. Distortion greatest near the poles.
Where does distortion on map occur?
When you “unroll” the cone on a flat surface, this becomes the mathematically developed surface. The most distortion occurs in
the north-south directions
. In general, distortion increases away from the standard parallels. For example, this map projection severely expands South America.
Where is there no distortion on a map?
Distortions. The only ‘projection’ which has all features with no distortion is a globe.
1° x 1° latitude and longitude is almost a square
, while the same ‘block’ near the poles is almost a triangle. There is no one perfect projection and a map maker must choose the one which best suits their needs.
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.
What is wrong with the Goode projection?
Distortion. Goode homolosine is an equal-area (equivalent) projection.
Shapes, directions, angles, and distances are generally distorted
. The scale along all parallels in the sinusoidal part, between 40°44’12” north and south, and along the central meridians of the projection is accurate.
What are the problems with distortion when using a Mercator projection?
Although the linear scale is equal in all directions around any point, thus preserving the angles and the shapes of small objects, the Mercator projection
distorts the size of objects as the latitude increases from the equator to the poles
, where the scale becomes infinite.
What four distortions are there in the Robinson projection?
There are four main types of distortion that come from map projections:
distance, direction, shape and area
.
Why would you use a Robinson projection?
The Robinson projection is unique. Its primary purpose is
to create visually appealing maps of the entire world
. It is a compromise projection; it does not eliminate any type of distortion, but it keeps the levels of all types of distortion relatively low over most of the map.
What causes map distortion?
A map projection is a mathematical formula used to transfer all or part of the curved surface of the earth onto the flat surface of a map.
The process of flattening the earth
causes distortions in one or more of the following spatial properties: Distance. Area.
Why do maps show distortion?
If a map preserves area, then the size of a feature on a map is the same relative to its size on the earth. … To look at it another way, a coin moved to different spots on the map represents the same amount of actual ground no matter where you put it. In
an equal-area map
, the shapes of most features are distorted.
What are the 4 types of distortion?
When the earth is projected onto a flat surface there are at least four different types of distortion:
distance, direction, angle, and area
. It is impossible to preserve all four means of distortion on one flat projection.
Is the map really upside down?
The simple answer to the question was this:
It isn’t upside-down at all
. In a flip of convention, my giant, framed world map displays the southern hemisphere — Australia included — at the top. It’s a twist, but not strictly speaking a distortion.
What are the 3 most common projection surfaces?
The three types of developable surfaces are
cylinder, cone and plane
, and their corresponding projections are called cylindrical, conical and planar. Projections can be further categorized based on their point(s) of contact (tangent or secant) with the reference surface of the Earth and their orientation (aspect).
Which world map is most accurate?
View the world in correct proportions with this map. You may not know this, but the world map you’ve been using since, say, kindergarten, is pretty wonky. The Mercator projection map is the most popular, but it is also riddled with inaccuracies.
