Map projections Article Swipe
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· 1991
· Open Access
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· DOI: https://doi.org/10.3133/ofr91553a
· OA: W4230063557
ASPECT -Individual azimuthal map projections are divided into three aspects:( 1) the polar aspect, which centers the map at one of the poles of the globe; (2) the equatorial aspect, which centers the map at the equator; and (3) the oblique aspect, which centers the map anywhere else.(The word "aspect" has replaced the word "case" in the modern cartographic literature).CONFORMALITY-A map projection is conformal when (1) meridians and parallels intersect at right angles, and (2) at any point the scale is the same in every direction.The shapes of very small areas and angles with very short, sides are preserved.DEVELOPABLE SURFACE -A developable surface is a simple geometric form capable of being flattened without stretching.Many map projections can be grouped by a particular developable surface: cylinder, cone, or plane.EQUAL AREA -A map projection is equal area when every part, as well as the whole, has the same area as the corresponding part on the earth, at the same reduced scale.GRATICULE-The graticule is the spherical coordinate system based on lines of latitude and longitude."INTERRUPTED"~Interruption of a projection is where the continous surfrace of the map is broken.All maps are interrupted, usually a map is called "interrupted" if more than one meridian is involved.LINEAR SCALE-Linear scale is the relation between a distance on a map projection and the corresponding distance on the earth.LINE OF TANGENCY-The line where the developable surface intersects or touches the globe.MAP PROJECTION -A map projection is a systematic representation of a round body such as the earth on a flat (plane) surface.Each map projection has specific properties that make it useful for specific objectives.POINT OF TANGENCY-The point where the developable surface (a plane) touches the globe.PRIME MERIDIAN-The zero meridian (longitude 0°) which passes through Green wich England.SCALE FACTOR -The relation between the scale of the map projection and the actual scale of the globe.
