GIS Dictionary

R-squared

A statistic computed by the regression equation to quantify model performance. The value of R-squared ranges from 0 to ...

R-tree

A tree data structure, similar to a B-tree, used for indexing spatial data within a database. In an R-tree structure, ...

radar

Acronym for radio detection and ranging. A device or system that detects surface features on the earth by bouncing ...

radar altimeter

An instrument that determines elevation, usually from mean sea level, by measuring the amount of time an electromagnetic pulse ...

radiation

The emission and propagation of energy through space in the form of waves. Electromagnetic energy and sound are examples ...

radiometer

An instrument that measures the intensity of radiation in a particular band of wavelengths in the electromagnetic spectrum, such ...

radius

The distance from the center to a point on the outer edge of a circle, circular curve, or ...

range

A parameter of a variogram or semivariogram model that represents a distance beyond which there is little or no autocorrelation ...

range domain

A type of attribute domain that defines the range of permissible values for a numeric attribute. For example, ...

rank

A method of assigning an accuracy value to feature classes to avoid having vertices from a feature class collected ...

raster

1 A spatial data model that defines space as an array of equally sized cells arranged in rows ...

Raster Calculator

An ArcGIS Spatial Analyst tool for performing mathematical calculations with operators and functions, setting up selection queries, or ...

raster postprocessing

In ArcScan, the automatic correction of vector feature results immediately after batch vectorization is completed. Postprocessing involves generalizing ...

raster preprocessing

Simple raster editing that prepares images for viewing and analysis. Preprocessing includes georeferencing, clipping, positioning, resizing, enhancing, and ...

raster tracing

An interactive vectorization process that involves drawing along the boundary of contiguous raster cells to create vector features.

raster type

In ArcGIS, identifies metadata, such as georeferencing, acquisition date, and sensor type, along with a raster format.

ratio data

Data classified relative to a fixed zero point on a linear scale. Mathematical operations can be used on ...

ratioing

In digital image processing, enhancing the contrast between features in an image by dividing the values of pixels in one ...

ray tracing

A technique that traces imaginary rays of light from a viewer's eye to the objects in a three-dimensional ...

RDBMS

Acronym for relational database management system. A type of database in which data is organized across one or ...

reconcile

In concurrency management, to merge all modified data in the current database edit session with a second version ...

record

1 A set of related data fields, often a row in a database, containing all the attribute values ...

rectilinear

1 Characterized by straight lines, usually parallel to orthogonal axes. 2 A map or image whose horizontal ...

recycling

The process by which server instances in a pool are replaced by new instances of services. Recycling allows services ...

redundancy

In Survey Analyst, occurs when the number of observed measurements is greater than the number of computed coordinates ...

reference

A pointer to an object, interface, or other item allocated in memory. COM objects keep a running total of ...

reference data

In geocoding, material containing the location and address information of specific features. Reference data consists of the spatial representation ...

reflectance

The proportion of incident radiant energy that is reflected by a surface. Reflectance varies according to the wavelengths of ...

Regedit

A utility, part of the Windows operating system, that allows you to view and edit the system registry.

region

1 In geography, an area usually distinguished by common cultural or physical characteristics, such as Southern California, Western Europe, ...

register

1 To align two or more maps or images so that equivalent geographic coordinates coincide. 2 To ...

registration number

A three-letter, nine-digit number (ABC123456789, for example) that authenticates software with ESRI. Every single use and server product, ...

registry

Stores information about system configuration for a Windows machine. COM uses the registry extensively, storing details of COM components ...

registry file

A file containing information in Windows Registry format. Double-clicking a .reg file in Windows will enter the information in ...

regression

A statistical method for evaluating the relationship between a single dependent variable and one or more independent variables thought ...

regression equation

The mathematical formula applied to independent variables to best predict the dependent variable being modeled. The notation in regression ...

RegSvr32

A Windows utility that registers a DLL or similar component library to a system registry. A DLL and its ...

reject processing

Handling unmatched addresses through fine-tuning the geocoding process. After a table of addresses are matched the first time, unmatched ...

relate

An operation that establishes a temporary connection between records in two tables using a key common to both.

relate manager

An ArcToolbox utility used to build, modify, save, and delete connections (relates) between tables. Saved connections can be ...

relationship

An association or link between two objects in a database. Relationships can exist between spatial objects (features), between ...

relief

Elevations and depressions of the earth's surface, including those of the ocean floor. Relief can be represented on maps ...

remote sensing

Collecting and interpreting information about the environment and the surface of the earth from a distance, primarily by ...

renderer

A mechanism that defines how data appears when displayed. For example, the hillshade renderer for raster data in ...

rendering

The process of drawing to a display; the conversion of the geometry, coloring, texturing, lighting, and other characteristics ...

replica

In geodatabase editing, the portion of the data in a geodatabase that is copied from a source geodatabase ...

replica version

In geodatabase editing, the version being replicated during the replication process. For all replica types, the replica version ...

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