GIS Dictionary | Letter M

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– M –

Magnetic Declination
The angle between magnetic north as shown by the needle of a compass and true north.

A two-dimensional representation of a piece of three-dimensional space.

Map Gallery
A collections of maps sometimes grouped by a common theme. Map galleries are a popular method of showcasing. You’ll often find them at Geography related conferences. Ever increasing are online map galleries.

Map Projection
A method used to represent the 3-dimensional surface of the earth or other round body on a 2-dimensional plane in cartography (mapmaking). This process is typically, but not necessarily, a mathematical procedure (some methods are graphically based).

Map Reading
The art of interpreting or understanding the information conveyed by a map.

The use of maps and cartography to promote a specific (and often political) agenda.  See the post on Maptivism.

Two or more images taken simultaneously, but each image taken in a different part of the electromagnetic spectrum.


GIS Acronyms that start with M

MAPPS – Management Association for Private Photogrammetric Surveyors

MIS – Management Information System

Regional Organizations

MERLIN – Maryland’s Environmental Resources and Land Information Network

More geographic concepts from the GIS dictionary:

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z


Where is the Phrase “80% of Data is Geographic” From?

GIS Dictionary | Letter A