Datum vs Projection - What's the difference?
datum | projection |
(plural:'' data ) A measurement of something on a scale understood by both the recorder (a person or device) and the reader (another person or device). The scale is arbitrarily defined, such as from 1 to 10 by ones, 1 to 100 by 0.1, or simply ''true'' or ''false'', ''on'' or ''off'', ''yes'', ''no'', or ''maybe , etc.
(plural: data ) (philosophy) A fact known from direct observation.
(plural: data ) (philosophy) A premise from which conclusions are drawn.
(plural: datums ) (cartography, engineering) A fixed reference point.
* 2007 , Roger F Tomlinson, Thinking about GIS: geographic information system planning for managers
Something which projects, protrudes, juts out, sticks out, or stands out.
The action of projecting]] or throwing or [[propel, propelling something.
The display of an image by devices such as movie projector, video projector, overhead projector or slide projector.
A forecast or prognosis obtained by extrapolation
(psychology) A belief or assumption that others have similar thoughts and experiences as oneself
(photography) The image that a translucent object casts onto another object.
(cartography) Any of several systems of intersecting lines that allow the curved surface of the earth to be represented on a flat surface. The set of mathematics used to calculate coordinate positions.
(geometry) An image of an object on a surface of fewer dimensions.
(linear algebra) An idempotent linear transformation which maps vectors from a vector space onto a subspace.
(mathematics) A transformation which extracts a fragment of a mathematical object.
(category theory) A morphism from a categorical product to one of its (two) components.
As nouns the difference between datum and projection
is that datum is date (point of time at which a transaction or event takes place) while projection is something which projects, protrudes, juts out, sticks out, or stands out.datum
English
Noun
(en-noun)- Datums are another important map aspect related to projection. A datum provides a base reference for measuring locations on Earth's surface.
Derived terms
* datum circle * datum line * datum plane * datum point * datum surfaceReferences
*AskOxford.com: Is 'data' singular or plural?* (The American Heritage Dictionary's usage note on 'data') *
John Quiggin: Data is not the plural of datum*
johnaugust.com: ‘Data’ is singularEnglish nouns with irregular plurals English words affected by prescriptivism ----
projection
English
Noun
(en noun)- The face of the cliff had many projections which are big enough for birds to nest on.