R-T

In this section:

 


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Raster

A cellular data structure composed of rows and columns. Groups of cells represent features. The value of each cell represents the value of the feature. Image data is stored using this structure.


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RDBMS

Relational Database Management System. A method of structuring data as collections of tables that are logically associated to each other by shared attributes. Any data element can be found in a relation by knowing the name of the table, the attribute (column) name, and the value of the primary key.


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Rendering

The conversion of the geometry, coloring, texturing, lighting, and other characteristics of an object into a display image.


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Scale

The extent of reduction needed to display a representation of the earths surface on a map. A statement of a measure on the map and the equivalent measure on the earth surface, often expressed as a representative fraction of distance such as 1:24,000 (one unit of distance on the map represents 24,000 of the same units of distance on the earth). Scale can also be expressed as a statement of device dedicated to storing files. Any user on the network with permission can store files on the server. Equivalence using different units, for example, 1 inch = 1 mile or 1 inch = 2,000 feet.


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Server (Hardware)

A computer or device on a network that manages network resources. For example, a file server is a computer and storage Servers are often dedicated, meaning that they perform no other tasks besides their server tasks.


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Server (Software)

The program that manages resources on the server computer.


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Service

A Windows process that continuously runs in the background and performs a specified operation at predefined times or in response to certain events. The equivalent UNIX term is a daemon.


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Servlet

Servlets are modules of Java code that run in a server application (hence the name "servlets", similar to "applets" on the client side) to answer client requests. Servlets are a Java platform technology for extending Web servers that provide a component-based, platform-independent method for building Web-based applications.


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Shapefile

A shapefile is a simple, non-topological format for storing the geometric location and attribute information of geographic features.


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Spatial Data

Information about the location, shape, and relationships among geographic features.


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Spatial Filter

A process of selection using different geometries (for example, point, line, and polygon) in a spatial dataset.


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SQL

Structured Query Language. SQL is a standardized query language for requesting information from a database.


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Symbology

A graphic pattern used to represent a feature. Many characteristics define symbols including color, size, angle, and pattern.


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TCP/IP

Transmission Control Protocol/Internet Protocol. The group of protocols that defines the Internet.


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Threads

Also known as instances. Threads are processes running on a server. The number of threads typically indicates the number of simultaneous connections to an application or process that can occur.


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Tiled Map Service

A service that uses a set of prerendered map images stored on the server for rapid retrieval. This is the fastest way to serve maps on the Web and is most commonly used to display base layers in Web mapping.


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