What do the map projection depend on?
What do the map projection depend on?
Often, the map projection is predetermined. If it is not predetermined, a lot depends on the map size, the scale, shape and location of the region of interest on the globe. Depending on the purpose, equivalent, conformal and compromising projections are used.
What factors can projections be based on?
As you have learned, projections can be categorized based on the three types of surfaces that a map can be projected onto: cylinder, cone, and plane. Projections can also be categorized based on the spatial property they preserve.
How do you choose a map projection?
When you choose a projection, the first thing to consider is the purpose of your map. For general reference and atlas maps, you usually want to balance shape and area distortion. If your map has a specific purpose, you may need to preserve a certain spatial property—most commonly shape or area—to achieve that purpose.
Why is the choice of map projection important?
The larger the area covered by a map, the greater the distortion. Depending on the map’s purpose, cartographers must decide what elements of accuracy are most important to preserve. This determines which projection to use. For example, conformal maps show true shapes of small areas but distort size.
What are the different map projections?
Introduction
| Projection | Type | Key virtues |
|---|---|---|
| Stereographic | azimuthal | conformal |
| Lambert Conformal Conic | conic | conformal |
| Mercator | cylindrical | conformal and true direction |
| Robinson | pseudo-cylindrical | all attributes are distorted to create a ‘more pleasant’ appearance |
When choosing a map projection which of the following questions should you ask?
When choosing a map projection, which of the following questions should you ask? (Choose three.) What is the map’s theme or subject matter? What region of the world is being mapped? What scale is being mapped?
What type of map projection would you likely choose to use?
Introduction
| Projection | Type | Comments |
|---|---|---|
| Mercator | cylindrical | Created in 1569 Best Used in areas around the Equator and for marine navigation |
| Robinson | pseudo-cylindrical | Created in the 1963 Best Used in areas around the Equator |
| Transverse Mercator | cylindrical | Created in 1772 Best Used for areas with a north-south orientation |
What factors do you need to consider as you create a map to determine the most appropriate scale and projection?
Features such as size, shape, distance, or scale can be measured accurately on Earth. Once projected on a flat surface, however, only some of these qualities can be accurately represented. Every map has some sort of distortion. The larger the area covered by a map, the greater the distortion.
What are the 3 basic projection types?
Certain map projections, or ways of displaying the Earth in the most accurate ways by scale, are more well-known and used than other kinds. Three of these common types of map projections are cylindrical, conic, and azimuthal.
What are projections?
Projection has various meanings, but what they all have in common is that something is sent out or forward. A movie is projected onto a screen; a skilled actress projects her voice out into a large theater without seeming to shout; and something sticking out from a wall can be called a projection.
