The video above is from the september 2012 ipad edition of national geographic magazine choosing a map projection is a major challenge for cartographers features such as size, shape, distance, or scale can be measured accurately on earth once projected on a flat surface, however, only some of. Projections: maps are called projections because map-makers have to project a 3-d surface onto a 2-d map a projection is a representation of one thing onto another, such as a curved 3-dimensional surface (like the earth) onto a flat 2-dimensional map. A map projection that foregrounded the new world, combined with the heart representing divination or forethought, repositions heart-shaped world maps as visual devices designed to provoke ideas about humanity's fate at the end of days. This is the plate carree projection of canada the plate carree projection is a grid system the equator is used as the standard parallel, the poles are represented by parallel lines at the top and bottom of the projection, and each grid cell is a perfect square.
Because maps are flat, some of the simplest projections are made onto geometric shapes that can be flattened without stretching their surfaces these are called developable surfaces some common examples are cones, cylinders, and planes a map projection systematically projects locations from the. Map projections meaning and facts literally thousands of map projections exist each one distorts one or more of the four major map attributes the projection that a cartographer chooses depends on the size and location of the area to be projected and on the purpose of the map. In gis and other mapping it is important to choose an appropriate map projection to accurately depict the earth's surface a map projection is defined as a tool that transforms the earth's surface into a flat plane that can be shown on paper and/or digital maps map projections are based on an.
The mercator projection is a cylindrical map projection presented by the flemish geographer and cartographer gerardus mercator in 1569 it became the standard map projection for nautical purposes because of its ability to represent lines of constant course, known as rhumb lines or loxodromes, as straight segments. Mercator projection: mercator projection, a map projection introduced by flemish cartographer gerardus mercator in 1569 the mercator projection is a useful navigation tool, as a straight line on a mercator map indicates a straight course, but it is not a practical world map, because of distortion of scale near the poles. A map scale is a ratio of the distance on a map to the actual distance of the ground map scales can usually be found on the outer edge of a map, usually near the map's key (a set of symbols that. Map - map projections: a great variety of map projections has been devised to provide for the various properties that may be desired in maps in effect, a projection is a systematic method of drawing the earth's meridians and parallels on a flat surface. The lambert projection conformal maps preserve the shapes of small areas exactly, although the scale of the map may vary from point to point conformality is an extremely valuable property for maps that are to be used critically, and not just for general orientation or decoration.
Ap human geography chapter 1 description definition 2300 bc earliest surviving maps written on clay tablets map scale, map projection, map type: term map. The definition of the map projection for projected coordinate systems other measurement system properties such as a spheroid of reference, a datum, one or more standard parallels, a central meridian, and possible shifts in the x- and y-directions. The act, process, or result of projecting also called map projection cartography a systematic construction of lines drawn on a plane surface representative of and corresponding to the meridians and parallels of the curved surface of the earth or celestial sphere.
Definition of projection - an estimate or forecast of a future situation based on a study of present trends, the presentation of an image on a surface, espec. • the tires have short metal projections to improve traction on snow and ice • next year's sales projections • first bank officials, however, contend they will find other means to bolster earnings and maintain their projections. Maps which require correct distances measured from the centre of the map to any point (eg air-route, radio or seismic maps) or maps which require reasonable area and angle distortions (several thematic maps) often make use of an equidistant map projection.
Map projection selection is a complex process involving an evaluation of map projection alternatives based on a set of characteristics that describe these projections and types of analyses to be performed. Map projections and distortion converting a sphere to a flat surface results in distortion this is the most profound single fact about map projections—they distort the world—a fact that you will investigate in more detail in module 4, understanding and controlling distortion. A tour of less familiar world maps goode is an interrupted, equal-area, composite projection composed of 12 regions that form six lobes, each the top section of a mollweide projection, carefully.