GIS Dictionary

macro

A computer program, usually a text file, containing a sequence of commands that are executed as a single command. ...

map

1 A graphic representation of the spatial relationships of entities within an area. 2 Any graphical representation of ...

map algebra

A language that defines a syntax for combining map themes by applying mathematical operations and analytical functions to ...

map cache

A setting used in ArcMap that allows temporary storage of geodatabase or ArcIMS feature service features from a ...

map library

In ArcInfo Workstation Map Librarian, a collection of geographic data partitioned spatially as a set of tiles and ...

map unit

The ground unit of measurementfor example, feet, miles, meters, or kilometersin which coordinates of spatial data are stored.

MapServer

An ArcGIS Server software component that provides programmatic access to the contents of a map document on disk ...

MapTip

In ArcGIS, a user-assistance component that displays an on-screen description of a map feature when the mouse is ...

marshalling

The process that enables communication between a client object and server object in different apartments of the same process, ...

mashup

In Internet mapping, the combination of content from more than one data source into one dynamic map service.

mask

1 In digital cartography, a means of covering or hiding features on a map to enhance cartographic representation. For ...

mass point

An irregularly distributed sample point, with an x-, y-, and z-value, used to build a triangulated irregular network (TIN). Ideally, ...

matrix

A rectangular arrangement of data, usually numbers, in rows and columns. In computer science, a two-dimensional array is called ...

MAUP

Acronym for modifiable areal unit problem. A challenge that occurs during the spatial analysis of aggregated data in ...

max extent

The maximum bounding rectangle (in x,y coordinates) of an on-screen map. Users cannot zoom out beyond the max ...

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