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 ...

mean

The average for a set of values, computed as the sum of all values divided by the number of ...

members

1 Refers collectively to the properties and methods, or functions, of an interface or class. 2 In ArcGIS ...

memory leak

In computer programming, the loss of computer memory that occurs when an application or component fails to free a ...

menu

A list of available commands or operations displayed on a computer screen from which a user can make a ...

merge policy

In geodatabases, rules that dictate what happens to the respective attributes of features that are merged together during ...

meridian

A great circle on the earth that passes through the poles, often used synonymously with longitude. Meridians run northsouth between ...

metadata

Information that describes the content, quality, condition, origin, and other characteristics of data or other pieces of information. Metadata for ...

method

In object-oriented programming, an action that an object is capable of performing. Objects that belong to the same class ...

micron

One millionth of a meter, represented by the symbol m. Microns are used to measure wavelengths in the electromagnetic ...

MIDP

Acronym for Mobile Information Device Profile. A set of J2ME APIs for wireless devices.

minute

1 An angle equal to 1/60 of a degree of latitude or longitude and containing sixty seconds. 2 ...

mixed pixel

In remote sensing, a pixel whose digital number represents the average of several spectral classes within the area that it ...

model

1 An abstraction of reality used to represent objects, processes, or events. 2 A set of rules ...

Page 1 of 2 1 2